Science One Liners

1
The heat-resistant variety of glass is _____ glass. — Pyrex
The synthetic fibre that is known as artificial silk is _____.
— Rayon
In the process of vulcanization, natural rubber is heated with _____.
— Sulphur
Bagasse, a by-product of the sugar manufacturing industry, is used in
the manufacture of ______. — Paper
The first synthetic fibre made by the human was _____. — Nylon
Sensitive instruments can be shielded from external magnetic effects by
surrounding them with a _____ shield. — Brass
A mixture of water and alcohol can be separated by _______.
— Distillation
Ordinary cooking oil can be converted into vegetable ghee by the process
of ______. — Hydrogenation
Light energy gets converted into chemical energy in the process of ______.
— Photosynthesis
A substance that readily changes into vapour without need of heating is
said to be highly _____. — Volatile
The final products of combustion of ethane are ______ and water.
— Carbon doixide
The process by which an organic compound breaks down into simpler
compounds on heating to high temperatures is known as ______.
— Pyrolysis
The hydrometer is an instrument used to measure _____ of liquids.
— Specific gravity
The kilohertz is a unit that measures the ____ radiowave frequencies.
— electromagnetic
A ringing bell cannot be heard on the surface of moon. Why?
— The moon does not have any atmosphere to propagate sound waves.
What is ballistics? — It is the science of projectiles.
Give one element which is used in making semiconductor devices.
— Germanium.
Name the instrument used to measure radioactivity.
— Geiger Counter.
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2
What is “Electrum”?
— It is a natural alloy of gold and silver. (55% to 85%)
What is “metrology”?
— It is the scientific study of weights and measures.
The filament of an electric bulb is made of ________ — Tungsten
Water has maximum density at _______ (temperature) — 4° C
The chemical formula of Plaster of Paris may be given as ______.
— CaSO4,2H2O
The element most abundantly found in the earth’s crust is ______.
— Aluminium
The form of phosphorus used in making safety matches is ______.
— Red phosphorus
The element present in the largest amount in rocks and minerals is
______. — Silicon
The purest form of iron is called _____. — Wrought iron
An alloy that finds use in making heating elements for electric heating
devices is _____. — Nichrome
Water is a good solvent of ionic salts because it has a high ____ moment.
— dipole
A superconductor is characterised by ____ permeability. — Zero
The main constituents of pearls are calcium carbonate and _____.
— Magnesium carbonate
Mesons are found in ____ rays. — Cosmic
The age of ancient geological formations is generally estimated by the
_____ method. — Carbon dating
The ____ is employed as a moderator in a nuclear reactor.
— Graphite
Amalgams are alloys that contain ____ as one of the constituents.
— mercury
The property of a substance to absorb moisture from the air on exposure
is called _____. — Deliquescence
The element that is obtained from sea weeds is _____. —
Iodine
Radioactive disintegration of uranium ultimately results in the formation
of _____. — Lead

3
Radioactive pollutant had been in the news, owing to its occurrence in
building materials is ______. — Thorium
_____ is positively charged particles emitted by radioactive elements?
— Alpha rays
The dynamo is a device used for converting ____ energy into ____
energy. — Mechanical; electrical
The jet plane engine works on the principle of _____ momentum.
— Linear
A sailor in a submarine can see objects on the surface of the sea with
the help of a ______ — Periscope
The device that separates light into its component wavelengths is the
_____. — Interferometer
The working of the quartz cyrstal in the watch is based on the _____
effect. — Piezo
Thermo-couple is used to convert heat energy into ______ energy.
— electrical
______ occurs due to elongation of the eye balls.
— Shortsightedness
People have eyes of different colours e.g. brown, black or blue, depending
upon the particular pigment present in the ____. — Iris
The biological death of a patient means death of tissues of the _____.
— Brain
The membrane that protects the developing embryo from desiccation is
_____. — Amnion
The unit of classification of plants and animals is _____. — Species
The pH of human blood is between _____. — 7.5-8
A person suffering from protanopia or colourblindness, has difficulty in
distinguishing between the _____ and ____ colours. — green; red
The clotting of blood vessels is called _____. — thrombosis
The life of an RBC (red blood corpuscle) in the human blood is approxi
mately ____ days. — 120
The RBCs (red blood corpuscles) are formed in the _____.
— bone marrow
The ‘graveyard of RBCs’ would refer to the ____. — spleen
The gland in the human body popularly called the ‘Adam’s apple’ is the
____ gland. — thyroid

4
The _____ produces the cortisone hormone in humans. — adrenal
The saliva that is excreted by the salivary glands contains an enzyme
called ____. — ptyalin
When the lens of the eyes becomes foggy, the disease indicated is ______.
— Cataract
The blood pressure in humans is connected with the _____ gland.
— Adrenal
The human skin layer is rendered impervious to water by ______.
— Keratin
The image formed on the retina of the eye is _______ and inverted.
— real
The rate of metabolism is directly regulated by the ____ gland.
— thyroid
_____ hours food takes in a normal human being to reach the end of
the intestine for complete absorption. — 12
The form of heart disease characterised by an inadequate supply of blood
to the heart is known as _____. — Angina
A person suffering from ______ would be advised to wear cylindrical
glasses. — Astigmatism
The colour of the skin is due to the presence of a substance called
______. — Melanin
The inspection and dissection of a human body after death is called
____. — Autopsy
Veins differ from arteries primarily in their ____ to control the direction
of flow. — Valves
Impure blood from all parts of the body enters the heart through the ____.
— Right auricle
The development of sex organs in humans is controlled by the ____
gland. — Pituitary
The human skull comprises ____ bones. — 5
What does the ‘funny bone’ refer to a _____. — nerve
The element present in the largest amount in the human body is ____.
— Oxygen
_____ is the diploid number of chromosomes in the human body.
— 46
From _____ stage of the silkmoth silk is obtained. — Cocoon

5
______ is used in the manufacture of bread because of its ability to produce
CO2
. — Yeast
The bats are able to fly in the dark because their wings produce _____.
— Ultrasonic waves
The ant can see the objects all around it due to the presence of _____
eyes. — Compound
The only snake that builds a nest is the _____. — King cobra
The organs that perform the same function, while being morphologically
different, are called _____ organs. — Analogous
With a rise in temperature, the speed of sound _____. — Increases
From which part of the plant is turmeric obtained? — Stem
A substance that can act both as an acid and a base is known as ____.
— Amphoteric
Cyanide acts as a poison by directly affecting the ____ and respiratory
system. — Cardiac
Drugs used for relieving pain is called _____. — Analgesics
Epilepsy is a disease of the ____ system. — Nervous
The disease that is characterized by an inflammation of the membranes
covering the brain and spinal cord is _____. — Meningitis
Amnesia is related to the loss of ______. — Memory
A cricket ball will get thrown to the maximum distance, if it is flung at
an angle of _____. — 45°
The X-ray can be employed as a means of treatment in the case of ____
diseases. — Cancerous
The Blight disease of potato can be cured by _______.
— Bordeaux mixture
The cotton fibre is extracted from the _____ of the plant. — Seed
The cell organelle that functions as the powerhouse of a living cell
is______. — Mitochondria
The metal whose ion is involved in stomatal regulation in plants is
_______. — Potassium
Animal semen for the breeding of animals remains fertile for a long
time at _____ temperature. — -196° C
Pulse crops are able to fix atmospheric nitrogen owing to their _____.
— Root nodules

6
The plastids that make the flowers and fruits conspicuous to animals,
for the purposes of pollination and dispersal, are _____.
— Chromoplasts
The part of the cell that is essential for the synthesis of protein is _____.
— Ribosome
Herbicides are the usual method employed for the elimination of _____.
— Weeds
For safe storage to be ensured, the moisture content of foodgrain at the
time of harvesting should not be higher than _____ per cent.
— 14%
The preservative used in tomato sauce is sodium — Benzoate
The presence of _____ makes cork cells impervious to water.
— Suberin
Who was the scientist who had first recognized and named the nucleus?
— Robert Brown
_______ are tumour-inducing genes. — Oncogenes
What fraction of the total sun’s rays reaching the earth is used up by
the plants in the process of photosynthesis is _____ per cent. — 1%
The term used to denote several individuals of a species living
together in a locality is _____. — Biocommunity
The ten per cent law pertaining to the transfer of energy in a food
chain had been given by _____. — Kindemanns
For plant metabolism, sulphur, calcium and magnesium constitute _____.
— Macronutrients
Nitrogen fixation is performed by ____ algae. — Blue-green
Cross-pollination, the process of deposition of pollen on the stigma of
another, is called ______. — Allogamy
Biodegradable water may normally be converted into useful substances
with the help of _____. — Bacteria
Nutrients get recycled in the atmosphere with the help of certain
microorganisms called _____. — Decomposers
The species to which humans belong is ____. — Homo sapiens
Life is believed to have appeared to earth about ____ billion year ago.
— 3.6
Compared with the human chromosome number of 46, the chimpanzee,
gorilla and orangutan have _____ chromosome. — 48

7
The evolution of the human species took place mainly in the continent
of ______. — Africa
The telegraphic code had been developed by ____. — Samuel Morse
The laws of electrolysis had been propounded by ____. — Faraday
The Indian scientists who is identified with the measurement of plant
growth is _____. — Meghnad Saha
The recipient of the Nobel Prize for the development of wireless telegraphy
was ______. — Marconi
Ornithology is the study of _____. — Birds
Gun powder had been invented by _____. — Roger Bacon
What is the study of life in outer space called _____. — Exobiology
Entomology refers to the study of ________. — Insects
The average salt content of sea water is ______ per cent. — 3.5%
Dr Hargobind Khurana is credited with the discovery of the synthesis of
_____. — Genes
Petrology refers to the study of the ______ in the earth’s crust.
— Rocks
The transistor had been invented by _____. — Shockley
A person standing in front of a mirror, upon finding that his image is
larger than himself may conclude that the mirror is _____.
— Concave
The time period of a pendulum, when taken to the moon, would _____.
— Increase
When cream is separated from milk, the density of milk _____.
— Increases
In a lamp, oil rises up the wick because of the _______.
— capillary action
Cream gets separated from milk being churned due to ____ force.
— Centrifugal
Burns caused by steam are much more severe than those caused by even
boiling water because steam contains ____ heat.
— latent
The sitting sun looks oval in shape because of _____ of the sun rays.
— Refraction
A shaving blade, when placed gently on water, floats because of _____.
— Surface tension

8
If the same force a acts upon two bodies, one heavy and one light, for the
same time, then both the bodies acquire the same ______.
— Momentum
When the speed of a body is doubled, its kinetic energy becomes _____.
— Quadrupled
A person climbing a hill bends forward in an attempt to increase _____.
— stability
The science dealing with the study of phenomena at very low temperatures
is known as _____. — Cyrogenics
The part of the sun that is visible during total solar eclipse is called
______. — Corona
The technique of recording and reproducing tridimensional images of
object is called ______. — Holography
The device used for measuring the depth of the sea is called ____.
— Fathometer
Residential houses generally get 220 V AC. The value 220 represents
____ voltage. — Effective
Radiocarbon dating is a technique used to estimate the age of fossils. To
estimate the age of the earth, one would employ _____ dating
— Uranium dating
Pollination by insects is called _____. — Ontomophily
The organ whose malfunctioning results in jaundice, and to which excessive
consumption of alcoholic drinks causes damage, is the _____.
— Liver
The worm that enters the intestine by penetrating the skin is _____.
— Hookworm
The phenomenon of ‘red snow’ in some arctic and alpine areas occurs
due to growth of a/an ____. — algae
The phenomenon of some plants developing fruits without fertilization
is called _____. — Parthenocarpy
A ______ is a substance that increases the speed of reaction.
— catalyst
‘Gobar gas’ contains in a predominant proportion ______.
— Methane
Natural rubber is made strong and bouncy by adding to it ______.
— Sulphur

9
The smallest possible unit of a chemical compound is ______.
— Molecule
The phenomenon involved in the process of dialysis, used on patients
with affected kidneys, is _______. — Osmosis
The most abundant element in the human body is _______.
— Oxygen
The particles that display a dual nature of being both particles and waves
are _____. — Electrons
In the earth’s crust, aluminium is found as _______. — Bauxite
The liquid used as the refrigerant in refrigerators is ______.
— Liquid ammonia
The substance that the body usually loses during dehydration is ______.
— Sodium chloride
The National Chemical Laboratory is situated in _______.
— Pune
A medicinal substance given to prevent a disease, or against the intake
of poisons is called _____. — Antidote
The compound used in anti-malarial drugs is ______.
— Chloroquin
Carbon, graphite and diamond are together called _____.
— Allotropes
The metal among the following that pollutes the air of a big city is _____.
— Lead
The type of glass is used in making lenses and prisms is _____.
— Flint glass
The catalytic properties of a substance may be best defined as a
phenomenon of _____. — Adsorption
The unit for measuring the pitch of frequency of sound is ______.
— Decibel
The nautical mile is a unit of distance used in _____.
— Navigation
In an engine run on diesel, ignition is caused through _____.
— Compression
The component of an electronic watch that corresponds to the pendulum
of a pendulum clock is the ______. — Crystal oscillator
Reflex actions are a function of the autonomous ______ system.

10
— Nervous
Oil from the germanium plant, used in making perfumes, is extracted
from its ______. — Stems
The organ in the human body that accumulates iodine is the _____ gland.
— Thyroid
The sugar that is present in considerable amount in the blood is _____.
— Glucose
The maximum temperature that the human skin can tolerate without
getting blisters is ______. — 40° C
The strongest of all muscles in the human body is the ______ muscles.
— Thigh
The chromosomal abnormalities present in unborn child (while still in
his mother’s womb) may be found by a technique called ______.
— Amniocentesis.
Water that contains calcium and magnesium is called _________ water.
— Hard.
Mycology refers to study of ______. — Fungi.
The normal speed of sound is _______. — 332 m/sec.
The double Helix structure of DNA molecule had been proposed by _______
and ______. — Watson, Kirck.
Light waves are ______ in nature. — electromagnetic.
_______ techniques can be used to establish the paternity of child.
— DNA finger printing.
Soap is prepared by boiling causative soda with ______. — fats.
The greenish-yellow colour seen on the hard boiled egg is due to the
formation of ______. — Hydrogen Sulphide.
Camel uses its hump for storing ______. — fats
The virus of AIDS affects the growth of _______ in blood.
— T-cells
The chemical employed as a fixer in photography is ______.
— Sodium Thiosulphate
Kilowatt is a unit of _______. — Power
Tape of tape recorder is coated with _______.
— Ferromagnetic powder.
Name at least four human diseases caused by viruses.

11
— Chicken pox , measles, rabies and poliomyelitismall-pox
had been eliminated from the planet earth.
Give the names of five hormone-producing glands-present in the human
body.
— Thyroid, Pituitary, Suprarenal, Pancreas and Testis.
In which year was small-pox eradicated?
— In May 1980, WHO formally announced that small-pox
had been eliminated from the planet earth.
Second largest human organ. — Liver
The weight of copper contained in the average human brain:
— 6 mg
Human face has ________ bones — 14
Who held more than 1300 patents for his inventions?
— Thomas Alva Edison
What is the drug used to increase the output of urine?
— diuretic
The hardest natural substance — Diamond
The two elements that give water a salty taste
— Sodium and Chloride
Yellow fever is a disease carried by: — mosquitoes
What regulates the amount of glucose in blood? — Insulin
How many adrenal glands are there? — Two
Electricity flows from (negative to positive/positive to negative)
— negative to positive
_______ is the natural sugar in the milk. — Lactose
Hereditary diseases such as haemophilia are caused by defective _______.
— genes
The life expectancy of a blue whale? — 90 years
The number of wings on a housefly? — Two pairs (4 wings)
Cats spend _____ hours asleep a day. — 16
A kilowatt is 1000 watts. What about a megawatt?
— 1,000,000 watts
Give the common name for iron oxide. — Rust
What is the common name for ‘rubella’ — German measles
How long does our body take to digest an apple?
— About an hour and a half

12
German silver is an alloy of copper, zinc and _____. — nickel
Monazite is an ore of _______. — Thorium
Old written material, that cannot be read easily, can be read by ________
rays. — Infrared
Chronometer measures ________. — Time
Very small intervals of time can be accurately measured by _______.
— Atomic clocks
The electrolyte in an ordinary dry cell is ______.
— Ammonium chroride
A foreign particle that stimulates the formation of antibodies is called a/
an ______. — Antigen
In humans the body temperature is regulated by the ____ gland.
— Hypothalamus
The function of the tongue in snakes is to _____ the food.
— Smell
In the skin of which area have maximum density of sweat glands ______.
— Armpits
An enzyme that works in an acidic medium is _______. — Pepsin
Plants utilize nitrogen in the form of _____. — Nitrate
A deficiency of iron in the diet causes ______. — Anaemia
The healing of wounds can be hastened by vitamin ______. — K
Wilson’s disease is caused by an excess in the human body of _____.
— Copper
Vitamin B-complex represents a group of __________ vitamins.
— 11
The specific test for the detection of tuberculosis is the _____ test.
— Mantoux’s
Transfer of genetic information from one generation to the other is
accomplished by the ______. — DNA
The study of the relation of plants and animals to their surroundings
is called _______. — Ecology
‘Origin of Species’ is a path breaking book written by ______.
— Charles Darwin.
The complete conversion of glucose in the presence of oxygen into carbon
dioxide and water, with release of energy is called ______.
— Aerobic respiration

13
Ergotism is caused due to consumption of ________.
— Contaminated grains.
The unit for measuring the distance of stars from the earth is _____.
— Light year
The science of growing grapes in the Mediterranean region is called
______. — Viticulture.
The major chemical compound found in human kidney stones is ______.
— Calcium Oxalate.
One astronomical unit is the average distance between the earth and the
_____. — Sun
Unit of electric current is ______. — Ampere.
The water content in cow’s milk is approximately _____ per cent.
— 80%
Yeast is a good source of vitamin _____. — B complex.
The spherical shape of small drop of rain is due to ________.
— Surface Tension
The metal that is generally mixed with gold to make ornaments is _______.
— Copper
The SIM card is used in _______. — Cellular Phones.
At _________ temperature all molecular motion ceases.
— Absolute zero/-273° K.

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