This document contains practice questions from lessons on atoms and molecules, structure of atoms, diversity in living organisms, why we fall ill, and natural resources. It includes 50 multiple choice questions across these topics from chemistry and biology, with the question followed by the answer. The questions test knowledge of concepts like atomic structure, chemical formulas, chloroplast structure in plants, infectious vs. non-infectious diseases, and ecosystem producers and consumers.

1. Holiday Homework (2014 -
15)
MCQs Practical Questions based on following
lessons:
 Atoms and Molecules.
(Chemistry)
 Structure of Atom.
(Chemistry)
 Diversity in living organisms.
(Biology)
 Why do we fall ill ? (Biology)
 Natural Resources. (Biology)

2. Atom and Molecules
1) Name the Indian philosopher who found the “the smallest
invisible particles of matter” as parmanu:
(a) Pakudha Katyayama
(b) Maharishi Kanad
(c) Aryabhatt
(d) Democritus
Answer: (a) Pakudha Katyayama.

3. 2) The number value 6.022 ×10²³ is also called
(a) Dalton’s number
(b) Avagadro’s number
(c) Atomic number
(d) Mass number
Answer: (b) Avagadro’s number.

4. 3) The number of moles for 52g of ‘He’ is:
( Atomic mass of ‘He’: 4u)
(a) 6.022× 10²³
(b) 13
(c) 52
(d) 1
Answer: (b) 13.

5. 4) Formula for Magnesium Chloride is:
(a) MgCl
(b) Mg2Cl
(c) MgCl2
(d) MgCl4
Answer: (c) MgCl2.

6. 5) The percentage of Hydrogen in H2O molecule is:
(a) 5.55
(b) 11.11
(c) 44.45
(d) 88.89
Answer: (b) 11.11.

7. Structure of Atom
1) Proton was discovered by:
(a) Ruther ford
(b) Goldstein
(c) Chadwick
(d) J.J Thomson
Answer: (b) Goldstein.

8. 2) Canal rays are:
(a) Negative charged particles
(b) Positive charged particles
(c) Beam of neutrons
(d) Gamma radiation.
Answer: (b) Positive charged particles.

9. 3) ᾳ - particles are:
(a) Negative charged particles
(b) Positive charged particles Beam of neutrons
(c) Beam of neutrons
(d) Gamma radiation
Answer: (a) Negative charged particles.

10. 4) ᾳ - particle is:
(a) A hydrogen nucleus
(b) A helium nucleus
(c) A proton
(d) A electron
Answer: (b) A helium nucleus.

11. 5) Two elements ‘X’ and ‘Y’ have the same atomic mass but their atomic
numbers are 20 and 21 respectively. ‘X’ and ‘Y’ are:
(a) Isobars
(b) Isotones
(c) Isomers
(d) Isotopes
Answer: (d) Isotopes.

12. Periodic Table Of Elements.

13. Diversity in living organisms
1) Chloroplast in Spirogyra is:
(a) Spirally arranged or ribbon shaped with pyrenoids
(b) Spirally arranged without pyrenoids
(c) Circular
(d) Cup –Shaped
Answer: (a) Spirally arranged or ribbon shaped with pyrenoids.

14. 2) Needle shaped structure inPinus plant is:
(a) Leaf
(b) Shoot
(c) Stem
(d) Reproductive part
Answer: (a) Leaf.

15. 3) Which among the following produce seeds?
(a) Thallophyta
(b) Bryophyta
(c) Pteridophytes
(d) Gymnosperms
Answer: (d) Gymnosperms.

16. 4) Which of the following called “Amphibians of Plant kingdom”.:
(a) Bryophytes
(b) Algae
(c) Pteridophytes
(d) Gymnosperms
Answer: (a) Bryophytes.

17. 5) Which one is a true fish?
(a) Jellyfish
(b) Starfish
(c) Dogfish
(d) Silverfish
Answer: (c) Dogfish.
(Note: Jellyfish is a coelenterate, Starfish is an echinoderm and
Silverfish is an insect.)

18. Why do we fall ill?
1) Which one of the following is an infectious disease?
(a) Diphtheria
(b) Diabetes
(c) Hypertension
(d) Cancer
Answer: (a) Diphtheria.

19. 2) Elephantiasis disease can have
(a) Short-term affect on our health
(b) No affect on our health
(c) Long term affect on our health
(d) Some times bad affect on our health
Answer: (c) Long term affect on our health.

20. 3) Ascaris worm lives in which part of human body?
(a) Kidneys
(b) Liver
(c) Small Intestine
(d) Large Intestine
Answer: (c) Small Intestine.

21. 4) Microbes which enter the body through nose most likely affect:
(a) Liver
(b) Heart
(c) Brain
(d) Lungs
Answer: (d) Lungs.

22. 5) Which of the following is a viral infection?
(a) Diphtheria
(b) Influenza
(c) Cholera
(d) Typhoid
Answer: (b) Influenza.

23. Natural Resource
1) Corbett National park is famous for:
(a) Neel Gai
(b) Snakes
(c) Rhinoceros
(d) Tiger
Answer: (d) Tiger.

24. 2) Green plants of an ecosystem are called:
(a) Producers
(b) Decomposers
(c) Consumers
(d) None of these
Answer: (a) Producers.

25. 3) Energy flow in the ecosystem is:
(a) Unidirectional
(b) Bidirectional
(c) Multidirectional
(d) None of these
Answer: (a) Unidirectional.

26. 4) Two important groups for detritivores are:
(a) Animal and plants
(b) Prokaryotes and Algae
(c) Prokaryotes and fungi
(d) None of these
Answer: (c) Prokaryotes and fungi.

27. 5) In which sphere of the environment Ozone layer is located?
(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Thermosphere
Answer: (b) Stratosphere.

28. DNA