This document contains multiple choice questions from science chapters on cells, microorganisms, metals and non-metals, forces and pressure, friction, sources of energy, and combustion. It tests knowledge of key concepts like cell structures, types of microbes, properties of metals and non-metals, forces, friction, renewable and non-renewable energy sources, and combustion reactions. The questions cover topics commonly found in middle school science curriculums.
Mcq on synthetic fibres plastic coal and petroleum material metals non metalsJaspreet Kaur Kalsi
In this worksheet you find the MCQ based on Synthetic fibers, coal and petroleum& metals and non-metals. These are helpful for CTET, PTET, JEE, and other competitive exams
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
Mcq on synthetic fibres plastic coal and petroleum material metals non metalsJaspreet Kaur Kalsi
In this worksheet you find the MCQ based on Synthetic fibers, coal and petroleum& metals and non-metals. These are helpful for CTET, PTET, JEE, and other competitive exams
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
Always pick the BEST answer. Please indicate your answer clearly..docxgalerussel59292
Always pick the BEST answer. Please indicate your answer clearly.
1) Catastrophists held that
A) all of Earth’s history would fit into 6,000 years.
B) all rocks had condensed from a global ocean.
C) the landscape had been shaped by a small number of catastrophes.
D) volcanoes and other indications of change were the result of minerals like coal burning underground.
E) All of the above were tenants of Catastrophism.
2) ________ was an important 18th-century English geologist and proponent of uniformitarianism.
A) Charles Lyell
B) Isaac Newton
C) James Hutton
D) James Ussher
E) All of the above were co-authors of the initial proposal and of uniformitarianism.
3) The peer reviewed best estimate for the age of Earth is ________ years.
A) 4.6 thousand
B) 6.4 trillion
C) 4.6 billion
D) 6.4 million
E) 4.6 billion plus or minus 4 billion
4) Which of the following best describes the fundamental concept of superposition?
A) Strata with fossils are generally deposited on strata with no fossils.
B) Older strata generally are deposited on younger strata without intervening, intermediate age strata.
C) Older fossils in younger strata indicate a locally inverted geologic time scale.
D) Any sedimentary deposit accumulates on top of older rock or sediment layers.
E) A black cat released from a closed box onto strata will always move toward the younger rocks.
5) A Theory
A) has undergone rigorous peer reviewed testing.
B) is an explanation of certain scientific observations that remains after the elimination of most other potential explanations.
C) will always be subjected to continued scrutiny by the scientific community.
D) is a definitive and final explanation of certain scientific observations.
E) All of the above describe a Theory
F) Only A), B) and C) can be used to describe a Theory.
6) All of the following are possible steps of scientific investigation except for ________.
A) the collection of scientific facts through observation and measurement
B) assumptionand acceptance of conclusions without prior experimentation or observation
C) the development of one or more working hypotheses or models to explain facts
D) development of observations and experiments to test the hypotheses
E) All of the above are routine steps of scientific investigations.
7) ________ rocks always originate at the surface of lithospheric plates.
A) Secondary
B) Igneous
C) Metamorphic
D) Sedimentary
E) All of the above
8) Which one of the following statements is not correct?
A) Metamorphic rocks may melt to magma.
B) Sedimentary rocks may weather to igneous rocks.
C) Magmas crystallize to form igneous rocks.
D) Igneous rocks can undergo metamorphism.
E) All of the above are correct.
9) The ________________________ states that fossil organisms succeed one another in a definite and determinable order.
10) The convective flow of liquid, metallic iron in the _____________________ is thought to generate Earth's magnetic field.
11) All other factors being equ.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
APEX INSTITUTE was conceptualized in May 2008, keeping in view the dreams of young students by the vision & toil of Er. Shahid Iqbal. We had a very humble beginning as an institute for IIT-JEE / Medical, with a vision to provide an ideal launch pad for serious JEE students . We actually started to make a difference in the way students think and approach problems.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
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Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
1. SCIENCE
MCQ -Class8
Chapter- 1
The Cell –Its Structure and functions
1. The largest cell is ______
a) PPLO b) Mycoplasma c)ostrich egg d)liver cell (c)
2. The basic living substance is ___________.
a) protoplasm b)endoplasmic reticulum c)cytoplasm d)mitochondria (a)
3. The colourless plastid which stores starch and protein is ________.
a) chloroplast b)leucoplast c)chromoplast d)none (b)
4. The rough endoplasmic reticulum is rough due to presence of _______.
a) ribosome b)mitochondria c)granules d)grains (a)
5. The ________ provides fixed shape and rigidity to plant cell.
a) cell wall b)cell membrane c)plasma lemma d)lysosome (a)
6. The thread like network in the nucleus is ________.
a) chromatin b)chromosome c)cilia d)flagella (a)
7. ________ helps in transport of material s in a cell.
a) endoplasmic reticulum b)ribosome c)vacuole d)plastid (a)
8. __________ stores excess of water and waste products in a cell.
a) ribosome b)vacuole c) golgi complex d)plastid (b)
2. Chapter-2
Microorganism
1. ______ is microorganism that can be crystallized and kept in jar for many days.
a) bacteria b)fungi c)virus d)protozoa (c)
2. _______ is suspension of dead or weakened microbes.
a) vaccine b)antibodies c)antibiotics d)bacteria (a)
3. ______ is chemical produced by fungus which inhibit the growth of other harmful
microorganisms.
a) antibiotic b)antibodies c)vaccine d)immunity (a)
4. ______ is the natural ability of an organism to have an inbuilt mechanism to resist and
destroy the infection.
a) antibiotic b)immunity c)antibodies d)none (b)
5. ______ helps in fixation of nitrogen in rice field in association with root of Cycas plant.
a) rhizobium b)fungus c)cyano bacteria d)bacteria (c)
6. Typhoid spreads through _________.
a) contaminated water b)air c)animal d)insects (a)
7. Foot and Mouth is a disease caused in cattle by __________.
a) bacteria b)virus c)fungi d)none (b)
8. Red rot of sugarcane is caused by which microorganism?
a) bacteria b)virus c)fungus d)none (c)
9. Which of the given food is preserved by drying method?
a) milk b)papaya c)jam d)jelly (b)
10. _________ is pressurised heating for a short time.
a) pasteurisation b)drying c)vacuum packing d)canning (a)
11. Hyperthermophiles are micro organism which live at ____________.
a) temperatures between 80o_
1220
c)cold desert
b) very low temperatures d)salt water lake (a)
12. Ability to eat away germ is speciality of ________.
a)red blood cell b)white blood cell c)liver d)plasma (b)
13. Unicellular microscopic fungi is _________
a) yeast b)mould c)toadstool d)penicillium (a)
3. 14. Deadly disease which is caused by parasitic microorganism called plasmodium is ______.
a) malaria b)dengue c)polio d)rubella (a)
15. Baker’s yeast produce gas which helps in rising of dough is ____________.
a) oxygen b)hydrogen c)carbon dioxide d)nitrogen (c)
16. Organ systems which are exposed to external environment are protected from bacteria
by presence of ___________.
a)mucus membrane b)HCl c)hairs d)plug (a)
17. Most of the bacteria in food are killed by ________.
a) HCl b) NaCl c) HNo3 d) water (a)
18. The ________ disease can be prevented by maintaining good personal hygiene.
a) cholera b)tuberculosis c)ringworm d)malaria (c)
4. Chapter-3
Metal and Non-Metal
1. __________ metal is liquid at room temperature .
a) mercury b)iron c)copper d)silver (a )
2. ________ is naturally occurring inorganic substance found deep under the surface of the
earth.
a) ore b)mineral c)metal d)non-metal ( b )
3. Example of non-metal which exist in solid state is __________ .
a) sulphur b)bromine c)chlorine d)oxygen ( a)
4. The property due to which a metal can be hammered into thin sheets without breaking is
_______.
a) malleability b)ductility c)tensile strength d)conductivity (a)
5. ________ does not react with dilute hydrochloric acid but reacts with sulphuric acid and
does not liberate hydrogen gas.
a) iron b)copper c)gold d)zinc (b)
6. Germanium is an example of ____________.
a) metal b)metalloid c)non-metal d)none (b)
7. Metallic oxide like MgO reacts with water to form a _______.
a)base b)acid c)salt d)water (a)
8. The purity of gold is expressed in terms of ____ ___.
a)carat b)ounce c)pound d)none (a)
9. _______ being a very light metal is used for making aircraft bodies .
a) aluminium b)copper c)zinc d)iron (a)
10. Silver is used for high precision electrical contacts in computer due to its property of ______.
a) malleability b)conductivity c)ductility d)none (b)
11. A homogenous mixture of two or more metal or a metal and non-metal is known as _____.
a) alloy b)element c)mineral d)compound (a)
12. ________ is an alloy made from iron , chromium and nickel .
a) stainless steel b)steel c)brass d)bronze (a)
13. Which of the following is an example of metalloid
a) sulphur b)sodium c)silicon d)phosphorus
5. 14. Rohan had learnt that non-metals on beating with hammer are generally broken into pieces.
Which of the following is a non-metal?
a) iron nail b)aluminium wire c)copper wire d)piece of coal (d)
15. Metals are generally hard, which of the following metal is an exception and can be cut with a
knife?
a) iron b)sodium c)gold d)magnesium (b)
16. Generally metallic oxides are basic and non-metallic are acidic in nature. Solution of which of
the following oxides in water will change the colour of blue litmus to red?
a)sulphur dioxide b)Magnesium oxide c)iron oxide d)copper oxide (a)
17. Which of the following non-metal reacts and catches fire on exposure to air?
a) phosphorous b)nitrogen c)sulphur d)hydrogen (a)
18. The correct sequence of steps involved in extraction of metal from its ore is (d)
a) removal of impurities, purify metal, reduction of ore
b) purify metal, removal of impurities, reduction of metal ore .
c) concentration of ore , refining of metal , reduction
d) removal of impurities from ore , reduction of ore , refining of metal
19. Which of the following is not property of sodium metal?
a) lustre b)hard c)low melting point d)solid at room temperature. (c)
20. Which metal among the following melts below 300
C.
a) copper b)aluminium c)gold d)caesium (d)
21. The composition of brass alloy is
a) copper b)copper and gold c)copper and zinc d)tin and zinc (c)
22. The non-metal used in batteries is
a) phosphorous b)nitrogen c) carbon d)sulphur (c)
23. Aluminium is used in making aircraft because
a) malleable b)light c)both i and ii d)none of the above (b)
24. One of the practical application of platinum is
a) electrical cables c)decorating food stuff
b) cooking vessel d)dentistry (d)
25. Which of the following is not property of an alloy?
a) strong b)resistant to corrosion c)hard d)Poor conductor of electricity (d)
6. Chapter-4
Force and Pressure
1. Pressure is inversely proportional to _______.
a) force b) thrust c)surface area d)time (c)
2. When a potter makes pots of different size and shape from kneaded clay. This change in
shape and size is due to ________.
a) force b)pressure c)area d)direction (a)
3. A ball rolling along the ground, gradually slows and finally stops due to _______force.
a) muscular b)frictional c)gravitational d)magnetic (b)
4. The pressure exerted by a stationary liquid kept in a container at any point inside the
liquid is known as ________ pressure.
a)atmospheric b)hydrostatic c) air d)none (b)
5. As we climb up the mountain the atmospheric pressure __________.
a)decreases b)increases c)remains same d)none (a)
7. Chapter-5
Friction
1. The skidding of vehicle on snow is because of very little _______.
a) pull b)friction c)push d)none (b)
2. Liquid pressure at any point inside the liquid, depends upon _______of the liquid and
the height of liquid column above that point.
a) area b)density c)weight d)none (b)
3. A ball bearing is used in shafts of motors, dynamos to reduce ______.
a) movement b)friction c)speed d)none (b)
4. Air resistance ______ with an increase in the speed of the object moving through it.
a) increases b)decreases c)remains same d)no change (a)
5. ________ is a substance that can reduce the force of friction between the two surface
in contact.
a) lubricant b)paste c)water d)push (a)
6. We often sprinkle talcum powder on the carom board . This is done to reduce ______
between the board and the striker.
a) friction b)movement c)speed d)contact (a)
8. Chapter-6
Sources of Energy
1. A _______ source of energy is a natural resource that can replenish itself naturally over
a short period of time.
a) non-renewable b)exhaustible c)renewable d)chemical (c)
2. ______ fuel formed by action of heat and pressure on the remains of dead plants and
animal .
a) fossil b)water c)battery d)none (a)
3. The strong heating of coal in absence of air is known as _______.
a) destructive distillation b)refining c)combustion d)burning (a)
4. _______ is one of the product formed during refining of petroleum which is black and
sticky solid used for making roads.
a) paraffin wax b)asphalt c)kerosene d) gasoline (b)
5. Which among them is cleaner fuel –coal , LPG, Diesel , kerosene ?
a) coal b)LPG c)diesel d)kerosene (b)
6. _______ is an alternative source of energy .
a) coal b)tidal energy c)petroleum d)fuel oil (b)
9. Chapter-7
COMBUSTION
1. The material which on heating in presence of oxygen catches fire easily and produces heat
and light energy is known as _________ material.
a) combustible b)non-combustible c)conducting d)none (a)
2. ________ present in air helps in combustion of fuel.
a) oxygen b)nitrogen c)carbon-di-oxide d)carbon –mono-oxide (a)
3. Burning of cow dung cakes is an example of __________ combustion.
a) slow b)rapid c)spontaneous d)explosive (a)
4. _________ is a substance which undergoes spontaneous combustion.
a) wood b)coal c)sodium d)cow dung cakes (c)
5. _______ is highly poisonous gas produced as a result of incomplete combustion.
a) oxygen b)carbon dioxide c)carbon mono oxide d)soot (c)
6. The middle zone of a candle flame is known as the ________ zone.
a) luminous b)non-luminous c)wax d)burning (a)
7. The unit of calorific value of fuel is __________ .
a) Kj /Kg b) J/Kg c)Kj /g d)J/g (a)
8. Increase in temperature due to excess of carbon dioxide in air which traps heat energy is
known as _______ .
a) global warming b)soot c)ash d)acid rain (a)
9. ________ fuels produce least amount of harmful gases and do not leave behind solid
residue on combustion.
a) solid b)gaseous c)liquid d )semi-solid (b)
10. The lowest temperature which at which a substance catches fire is ________ temperature.
a) ignition b)boiling c)freezing d)none (a)
11. The _________ gas produced during burning of coal is responsible for causing acid rain .
a) oxygen b)sulphur dioxide c)nitrogen d)water vapour (b)
12. The ________ zone of a candle flame is the hottest zone.
a) innermost b)outermost c)middle d)none (b)
10. 13. On a cold winter night , the process of sleeping in a room with closed door and windows
with coal fire burning inside may lead to death of a person due to excessive accumulation of
a) nitrogen monoxide b) nitrogen dioxide
c) carbon dioxide d) carbon monoxide (d)
14. A substance which reacts with oxygen giving heat is called a combustible substance. Which
one of the following is a combustible substance?
a) iron nail b)glass c)stone piece d)wood (d)
15. Which one of the following has highest calorific value?
a) kerosene b)biogas c)LPG d)petrol (c)
16. Magnesium ribbon on burning in air produces
a) magnesium oxide ,water and light c) magnesium oxide and heat
b) magnesium oxide , heat and light d) magnesium oxide, water and heat (b)
17. Which of the following is not a combustible substance?
a) camphor b)glass c)straw d)alcohol (b)
18. The substance that does not burn with flame is
a) LPG b)camphor c)dry grass d)charcoal (d)
19. On placing an inverted tumbler over a burning candle, the flame extinguishes after some –
time . This is because of non –availability of
a) oxygen b)water vapour c)carbon dioxide d)wax (a)
20. The substance expected to have the highest ignition temperature out of the following is
a) kerosene b)petrol c)coal d)alcohol (c)
21. Choose the correct statement about inflammable substance from the following. They have
a) low ignition temperature and cannot catch fire easily.
b) high ignition temperature and can catch fire easily .
c) low ignition temperature and can catch fire easily
d) high ignition temperature and cannot catch fire easily (c)
22. Choose the incorrect statement from the following : Forest fires are usually due to
a) carelessness of humans c) heat of sun
b) cutting of trees d) lightning strike (b)
11. 23. The calorific value of fuel is expressed in unit called
a) kilojoule per litre c) kilogram per millilitre
b) kilogram per gram d) kilo joule per kilogram (d)
24. The clearing of forest is called X and this can cause the soil to be washed away in the process
called soil Y. The excess carbon dioxide in the air results in Z . What can X, Y and Z be
i. X Y Z
Deforestation erosion global warming
Deforestation degradation heating
Logging erosion cooling
Logging degradation global warming
25. A heap of green leaves is lying in one corner of a park . The green leaves in the heap burn
with difficulty because
a) they contain a tough material called cellulose .
b) they contain lot of water
c) they contain a green pigment chlorophyll .
d) they do not get sufficient oxygen for burning
26. If the clothes of a person working in the kitchen catch fire , then to extinguish the fire.
a) Sand should be thrown over the burning clothes
b) Water should be thrown over the burning clothes
c) Polyester blanket should be used to cover the burning clothes .
d) Woollen blanket should be used to cover the burning clothes
27. The correct decreasing order of calorific value of the given combustible substance is
a) charcoal >petrol >LPG >wood b) LPG >petrol >charcoal >water
c) charcoal>LPG >wood >petrol d) Charcoal>petrol >wood>LPG
28. Rajni wondered why a flame always points upwards . This is because
a)The gases produced in a flame are hot . b)Hot gases are light and rise up.
c)cold gases are formed in the flame d)Both a)and b)
12. Chapter- 8
Conservation of plants and animal
1. There are _______ Biosphere Reserves in India .
a) 18 b)20 c)22 d)16 (a)
2. A reserve of land usually declared and owned by national government which is protected
from most human development works and pollution is known as _________.
a) National park b)hotspot c )biosphere reserve d)refuge (a)
3. The ___________ national park has two –thirds of the world’s one horned rhinoceros
population.
a) Jim-Corbett b) Kaziranga c)Bandipur d)Ranthambore (b)
4. A __________ is officially designated territory marked by government which provides
protection and living condition for wild animals.
a) wildlife sanctuary b)reserve c)park d)zoo (a)
5. A species is said to be _______ when no member of the species exists or is presumed
beyond reasonable doubt to have disappeared.
a) extinct b)endangered c)vulnerable d)none (a)
6. _______ is an example of vulnerable species.
a) dodo b)African wild dog c)cheetah d)blue whale (c)
7. _____________ is endemic to the Western ghats of south –west India.
a) lion tailed macaque b)orange –breasted sunbird c)gaur lion d)turtle (a)
8. A periodic movement of animals from their home to new area and its subsequent return
journey back to the original home is known as___________ .
a) migration b)afforestation c)deforestation d)hibernation (a)
9. _______ is group of organism which can interbreed under natural conditions .
a) species b) flora c) fauna d) genus (a)
10. Wild buffalo is an endangered species because :
a) its population is diminishing c)it has become extinct (a)
b) c)it is found exclusively in a particular area d)its poaching is strictly prohibited
13. 11. Which one of the change may occur due to desertification?
a) decrease in atmospheric temperature b) increase in water holding capacity of soil
c) increased chances of flood d)conversion of fertile land into a desert (d)
12. What do black buck , dodo , elephant and golden cat together represent in a forest .
a) fauna b)flora c)ecosystem d)species (a)
13. Migratory birds fly to far away during particular time of year. Which of the following
conditions present in their habitat during that time are responsible for this behaviour?
i) unavailability of food ii) extreme weather conditions
iii) over crowding iv)lack of nesting area .
a) ii and iii b)i and ii c) i and iv d)ii and iv (d)
14. In our country, large patches of forest are being cleared for cultivation of crops . The
environmental impact of such practice lead to
a) soil erosion b)soil conservation c)soil pollution d)soil fertility (a)
15. Pick out the correct example of man’s interference with nature that has upset the biological
equilibrium.
a) afforestation b)recycling of paper
c) poaching of endangered animals d) Rain harvesting.
16. Which of the following graph shows the correct effect of deforestation on pollution level.
17. Recently a Leopard entered a village near Ranchi, it seemed to have lost it way. People
called forest officials in order to save him. Why do you think leopard lost its way?
i. It smelt meat being cooked somewhere.
ii. Its habitat is lost due to deforestation & urbanisation .
iii. it could not find food and wandered looking for it.
iv. it came looking for humans to attack .
a)i and ii b)ii and iii c)iii and iv d)i and iv
14. Chapter- 9
Crop Production & Management
1. The living organism which make their own food through photosynthesis are known as
________.
a) autotrophs b)hetrotrophs c)decomposers d)saprophytes (a)
2. The practice of cultivating land for growing crops is known as ________ .
a) crop production b)agriculture c)sowing d)broadcasting (b)
3. _______ is a rabi crop grown during the months from November to April .
a) barley b)paddy c)maize d)sorghum (a)
4. The process of preparing soil which involves loosening and turning of soil is known as _____.
a) sowing b)ploughing c)broadcasting d)levelling (b)
5. In case of tomato plants seed are sown in small plot, and from here when seedlings are
formed they are manually planted in the field . This method is known as ______.
a ) transplantation b)sowing c)tilling d)levelling (a)
6. The quick growing plant like ______ acts as green manure.
a) alfalfa b)pea c)wheat d)gram (a)
7. _______ is one of the ways which can be used for soil replenishment.
a) field fallow b)transplantation c)tilling d)ploughing (a)
8. _________ method useful for watering plants growing in areas having acute water
shortage and in this method water falls drop – by –drop near the roots through narrow
pipes .
a) sprinkler system b)drip irrigation c)water logging d)weeding (b)
9. The chemical which kill weeds but does not harm the crop is _________.
a) weedicide b)pesticide c)fertiliser d)manure (a)
10. The falling down of crop due to untimely rain and strong winds is known as _______.
a) sowing b)lodging c)weeding d)logging (b)
11. _______ are organism which attack and destroy the crops.
a) weed b)pest c)logging d)chaff (b)
12. The cutting and gathering of crop after maturation is known as _______.
a) harvesting b)threshing c)winnowing d)sowing (a)
13. The process of separation of grains from cut crop after harvesting is known as ________.
a) harvesting b)threshing c)winnowing d)sowing (b)
15. 14. In 1960,_________ was brought about in India to make it self sufficient in grains .
a) green revolution b)operation flood c)chipko movement d)none (a)
15. The process of crossing two genetically different individual to obtain new individual having
desirable characters is known as __________.
a) hybridization b)broadcasting c)sowing d)emasculation (a)
16. The grains are separated from chaff by __________.
a) winnowing b)weeding c)sowing d)tilling (a)
17. Which one of the following condition is not essential to grow maize ?
a) high temperature b)humidity c) very low temperature d)rainfall (c)
18. Propagation of ginger is generally done using _______ .
a) seed b)stem (rhizome ) c)root d)leaf (b)
19. Which one of the following statement not true for organic manure ?
a) It enhances water holding capacity of soil .
b) It has a balance of all plant nutrients
c) It provides humus to soil.
d) It improves texture of soil. (b)
20. Read the statement given below
(i ) Seeds require moisture for germination .
(ii) Plant can absorb nutrients in dissolved form.
(iii) Irrigation protects crop from both frost and hot air currents .
(iv) Irrigation improves soil texture .
a) i and ii b) i ,ii, iii c) i , ii , iii , iv . d) i and iii (a)
21. 134 Given below are the statements about the harmful effects of weeds on crop plants.
i. They interfere in harvesting
ii. They help crops to grow healthy.
iii. They compete with crop plants for water, nutrients , space and light .
iv. They affect plant growth .
Choose the correct combination of statements
a) i, iii, iv b)iii only c) iii , iv d) i, ii , iii, iv (a)
16. Chapter-10
Refraction and Dispersion of light
1. When light falls on shiny surface it gets __________ .
a) refracted b)reflected c)bent d)nothing happens (b)
2. When a pencil is dipped in glass of water it appears bent near the surface of water due to
______ of light.
a) refraction b)reflection c)bouncing back of light d)none (a)
3. When light moves from air to water the ray of light bends ________ the normal.
a) away b)towards c)along d)no change (b)
4. The white light after falling on prism gets split into seven colours due to _______ of light.
a) reflection b)refraction c)dispersion d)bend (c)
5. ______ is natural phenomenon associated with dispersion of sunlight.
a) rainbow b)reflection c)dispersion d)refraction (a)
6. When beam of parallel rays of light falls on _______ then all the rays of light converge .
a) convex lens b)concave lens c)plain mirror d)plano concave lens (a)
7. In case of convex lens when the image formed is real, inverted and same size as the object
then the object should have been at ______ position of lens.
a) infinity b)focus c)2F d)between F and 2F (c)
8. When object is placed _______ in front of convex lens than image formed is virtual, erect,
magnified and on same side beyond F .
a) between optical centre and F b)At F c)between F and 2F d)2F (a)
9. A concave lens always forms a virtual, erect and ________ image .
a) same b)magnified c)diminished d)none (c)
10. The phenomenon of interchange of the left side and right side between the object and its
image is called_________.
a) reflection b)refraction c)dispersion d)lateral inversion (d)
11. The distance of the object from the plain mirror is 1.5 cm . What will be the total distance
between the object and its image.
a) 1.5cm b)3cm c)2.5cm d)1cm (b)
12. A concave mirror forms real, inverted and enlarged image at infinity. Where is the object
kept
17. a) at F b)at C c)between F and C d)beyond C (a)
13. 147 A ray directed towards the centre of curvature of a spherical mirror
a) become parallel to principal axis b)retraces its path
c)appears to diverge from focus d)passes through focus. (b)
14. Diffused reflection takes place through
a) metal b)glass c)wood d)thin transparent sheet (c)
15. The size of the image formed by a plane mirror is
a) bigger than the object b)same as object
c)smaller than the object d)far away from the object . (b)
16. The angle between the incident ray and normal is 350
. What will be the angle of reflection?
a) 35 b)45 c)55 d)65 (a)
17. The distance between Pole and Focus is called
a) principal axis b)focal length c)radius of curvature d)centre of curvature (b)
18. If the incident ray falls directly on the normal. What will be the angle of incidence .?
a ) 0 b)30 c)60 d)90 (a)
19. The angle between the surface of the mirror and incident ray is 420
. What will be the angle
of reflection?
a) 42 b)48 c)60 d)90 (b)
20. We can see non luminous object ,when the light
a) emitted by the object falls on the eye . b) is reflected from the object towards eye .
c) completely passes through the object . d) gets completely absorbed by object . (b)
18. Chapter-11
The Human Eye
1. The _______ the amount of light entering the eye.
a)iris b)pupil c)cornea d)lens (a)
2. _________ is liquid present in the space between the cornea and lens of the eye.
a)aqueous humor b)vitreous humor c)humor d)mucous (a)
3. The light sensitive cells that respond to dim light are ________.
a)cones b)rods c)cornea d)retina (b)
4. The junction of optic nerve and retina is insensitive to light and no image is formed here , it
is known as ______.
a)blind spot b)yellow spot c) fovea d)pupil (a)
5. The ability of the eye to change the focal length of its lens to see distant object is _______
a)accommodation b)adjustment c)change d)pinch (a)
6. Visually impaired people can read and write by using special touch system called
the_______.
a)Braille b)cassettes c)audio books d)CDs (a)
7. ______ is the defect which occurs in eye due to excessive curvature of cornea and person is
not able to see distant objects clearly .
a)myopia b)hypermetropia c)squint d)cataract ( a )
19. Chapter - 12
SOUND
1. The speed of sound through air is ______ .
a)330m/sec b)300 m/sec c)300 km/sec d)290 m/sec (a)
2. The maximum displacement of a vibrating body on either side of its central position is
known as _______________.
a)amplitude b)frequency c)time period d)hertz (a)
3. The SI unit of frequency is _______.
a)metre b)seconds c) hertz d)pascal (c)
4. If we tighten the strings of a musical instrument the pitch will be ________.
a)higher b)lower c)constant d)none (a)
5. Higher the frequency greater will be ________.
a)pitch b)loudness c)amplitude d)infrasound (a)
6. Ultrasonics and infrasonics are not detected by __________.
a)humans b)animals c)birds d)all of them (a)
7. Voice is produced by vibrations of _______.
a)vocal cords b)trachea c)lungs d)heart (a)
8. Bats detect the obstacles in their path by receiving the reflected ______.
a) infrasonic waves c) ultrasonic waves
b) electromagnetic waves d)radio waves (c)
9. Sound waves do not travel through _______.
a) solids b)gases c)liquid d)vacuum (d)
10. Which part of human ear converts sound vibrations into electric signals.
a)hammer b)stirrup c)tympanic membrane d)cochlea (d)
11. What do dolphins, bat and porpoise produce ?
a)ultrasound b)infrasound c)both i and ii d)audible sound (a)
12. Children under the age of 5 can hear up to___________.
a)25 Hz b)25 kHz c)20 Hz d)20kHz (b)
13. The minimum distance required for an echo to occur is _______.
a)30m b)17.2m c)100m d)20m (b)
20. 14. To hear distinct echo each time interval between original sound and reflected sound must
be
a)0.2sec b)1sec c)2sec d)0.1sec (d)
15. Speed of sound depends upon
a) temperature of medium b)pressure of medium
c)temperature of source producing sound d)temperature and pressure of medium
16. Which characteristic is this? We can distinguish between sound having same pitch and
loudness.
a)tone b)note c)pitch d)timbre (d)
17. Loud sound can travel a larger distance due to
a)higher amplitude b)higher energy c)higher frequency d)high speed (a)
21. Chapter - 13
Synthetic Fibres and Plastics
1. The purest natural form of cellulose is _______.
a) rayon b)cotton c)wool d)silk (b)
2. Rayon clothes are comfortable to wear in _______.
a) winters b)rainy season c)both a& b d)summers (d)
3. The first fully synthetic plastic was_________.
a) Bakelite b)melamine c)Teflon d)polythene (a)
4. The non-stick coating on pan and other cooking utensils is made from __________.
a) rayon b)Teflon c)melamine d)PVC (b)
5. The synthetic plastic used for making insulation cover in electrical wires is ________.
a ) Bakelite b)melamine c)Polyvinyl Chloride d)Poly styrene (c)
6. Which of the following is not part of 4R’s formula
a) reduce b)recycle c)recover d)reinvent (d)
22. Chapter-14
Reproduction in Animals
1. Set of reproductive terms are given below . Choose the set that has incorrect combination
a ) sperms ,testis, sperm duct ,penis b)menstruation, egg, oviduct ,uterus
c) sperm, oviduct, egg, uterus d)ovulation, egg, oviduct , uterus (c)
2. In humans, the development of fertilised egg takes place in the
a) ovary b)testis c)oviduct d)uterus (d)
3. In the list given, hen is odd one out : Human being, cow, dog, hen. The reason for this is
a) it undergoes internal fertilisation c)it is oviparous
b) it is viviparous d)it undergoes external fertilisation (c)
4. Animals exhibiting external fertilisation produce a large number of gametes .Pick the
appropriate reason for the following.
a) the animals are small in size and want to produce more off springs
b) food is available in plenty of water
c) to ensure better chances of fertilisation
d) water promotes production of large number of gametes (c)
5. Reproduction by budding takes place in
a) Hydra b)Paramecium c)Amoeba d)bacteria (a)
6. Which of the following statement about reproductions in human is correct.
a) fertilisation takes place externally
b) fertilisation takes place in the testes
c) during fertilisation egg moves towards sperm
d) fertilisation takes place in human female (d)
7. In human beings after fertilisation , the structure which gets embedded in the wall of uterus
is
a) ovum b)embryo c)foetus d)zygote (b)
8. Aquatic animals in which fertilisation occurs in water are said to be
a) viviparous without external fertilisation
b) oviparous with external fertilisation
c) viviparous with internal fertilisation
23. d) oviparous with internal fertilisation (b)
9. The belief that mother is completely responsible for the sex of the child is baseless because
the child
a) gets sex chromosome only from mother
b) develops in the body of mother .
c) gets one sex chromosome from the mother and the other from the father
d) gets sex chromosome from the father (c)
10. AIDS can spread from an infected person to another person through
a) sharing food b)blood transfusion c)sharing comb d)a mosquito bite (b)
11. Given below are the events that lead to pregnancy and development of embryo
i. fertilisation of egg
ii. maturation of egg
iii. release of egg
iv. embedding of embryo in uterus
a) i, ii, iii, iv b)ii, i, iii, iv c)i, iv , ii, iii d)ii, iii, i , iv, (d)
12. For the metamorphosis of tadpoles which of the following element must be available in
water?
a) carbon b)Chlorine c)Sulphur d)iodine (d)
13. Given below a figure related to reproduction in human. Identify X and Y in the given figure.
i.
a) X-Uterus and Y-Embryo b)X-Uterus &Y-Foetus
c)X- Fallopian tube and Y-Foetus d)X- Ovary and Y –Embryo
24. 14. Identify the organism and the process in the figure given below:
a)Amoeba budding b)Hydra, budding
c)Yeast, sexual reproduction d)bacteria , binary fission
15. Neha’s baby has reached the stage where its body parts can be seen by sonography . Thus it
is
a) embryo b)zygote c)egg d)foetus
25. Chapter- 15
Reaching the Age of Adolescence
1. The most consipicious change which occurs in boys during puberty is
a) development in voice box
b) increase in height
c) production of sperm
d) increased sweating ( b )
2. The structure present in a cell which is responsible for determination of sex of a baby is
a) cytoplasm b)cell membrane c)nucleus d)chromosome (d )
3. The hormone responsible for metamorphosis in frog is
a) Thyroxine b)adrenaline c) growth hormone d) insulin (a)
4. The rapid maturation of gonads takes place due to release of
a) Hormone b) enzyme c)mucous d) inhibitor (a)
26. Chapter – 16
Electric current and its Chemical effect
1. An electric current can produce
a) heating effect c)chemical effect
b) magnetic effect d)chemical, magnetic and heating effect (d)
2. Rohit’s uncle has set up an electroplating factory near his village. He should dispose off, the
waste of the factory (d)
a) in the nearby river c)in the nearby pond
b) in the nearby corn field d)according to the guidelines of local authority .
3. When the electric current is passed through conducting solution, there is change in colour of
the solution. This indicates
a) chemical effect of current
b) the heating effect of current
c) the magnetic effect of current
d) the lightning effect of current (a)
4. Which one of the following solution will not conduct electricity?
a) lemon juice b)vinegar c)vegetable oil d)tap water (c)
5. Which of the following metal is used in electroplating to make object appear shinning?
a) Iron b)copper c)chromium d)aluminium (c)
27. Chapter - 17
Stars and Solar System
1. Morning star is the name given to
a) pole star b)star Sirius c)planet Jupiter d)planet Venus (d)
2. The Sun appears to move from east to west around the earth. This means that earth rotates
from
a) east to west b)west to east c)north to south d)west to east (b)
3. An astronaut on the surface of the moon throws a ball upward. The ball would
a) directly fall down from the point it is released
b) hang in space
c) go up and then, come back the surface of moon
d) keep going up never to come back (c)
4. Suppose a new planet is discovered between Uranus and Neptune. Its time period would be
a) less than that of Neptune
b) more than that of Neptune
c) equal to that of Neptune and Uranus
d) less than that of Uranus (a)
28. Chapter -18
Earthquake
1. Earthquake are caused by what kind of disturbance under the earth?
a) movement of water
b) sliding of plates
c) toppling of earth
d) mining of earth (b )
2. A sudden shaking of the earth lasting for a short time is known as
a) lighting b)thunder c)earthquake d)Tsunami (c)
3. Richter scale is used to measure the magnitude of
a) lighting b)Charges c)Earthquake d)Rainfall (c)
4. Instrument used to find the source of seismic waves is known as
a) seismometer
b) voltmeter
c) galvanometer
d) ammeter (a)
5. During an earthquake , if we are outside we should
a) run indoors
b) stand near huge buildings
c) come out of the vehicles
d) drop to the ground (d)
6. Who discovered the instrument to measure the magnitude of earthquake ?
a) Dr Richter b)Dr Jenner c)Dr Watson d)Dr Franklin (a)
7. An earthquake of what intensity can cause destruction.
a) 2.5 b)7.0 c)1.5 d)0.5 (b)
8. Earthquake that occur beneath the ocean floor can lead to
a) Tsunami b)Flood c)Thunder d)Lightning (a)
29. Chapter - 19
Pollution of Air
1. Minimum air pollution is caused by burning of
a) coal b)kerosene c)LPG d)Diesel ( c )
2. High concentration of which gas will not cause air pollution ?
a) oxygen b)nitrogen dioxide c)carbon dioxide d)carbon monoxide ( a )
3. Smog leads to diseases of
a) skin b)heart c)lungs d)stomach ( c )
4. This cause the depletion of ozone layer by decomposing ozone to oxygen .
a) CFC b)UV radiations c)CO2 d)O2 ( b )
5. Depletion of ozone layer in the atmosphere causes cancer of
a) skin b)stomach c)blood d)lungs ( a)
6. Carboxy haemoglobin is formed when haemoglobin combines with
a) carbon dioxide b)CFCs c)carbon monoxide d)none of these ( a)
7. Why are trees grown along road sides?
a) to absorb noise c)to take in carbon dioxide
b) to trap dust and soot d)all of these
30. Chapter-20
Pollution of water
1. Potable water is the water which is
a) Obtained from a river b)obtained from a lake
c) Used for washing clothes d) Pure and fit for drinking (d)
8. When domestic sewage / fertilisers is released into rivers , the growth of algae and bacteria
is
a) promoted b)not affected c)inhibited d)None of the above (a)
9. The pollutants in water can be recognized by
a) bad taste b)offensive odour c)growth of aquatic weed d)all the above (d)
10. Which of the following is not a feature of potable water?
a) It must be clean, colourless and odourless.
b) It must be free from bacteria
c) It must have excessive sodium ,calcium and magnesium
d) It must contain dissolved oxygen and carbon dioxide (c)
11. A pond contains clean water. Which of the following activities will produce least pollution of
water?
a) Washing clothes in the pond c)domestic waste
b) industrial waste d)Swimming in the pond (d)