1.
What are polyatomic ions?
2. What is meant by the term chemical formula?
3. State the law of conservation of energy.
4. How would you choose between two characteristics to be used for developing a hierarchy in classification?
5. Why are the ceilings of concert halls curved?
6. What would happen if all the oxygen present in the environment is converted to ozone?
7. Prove that v= υ λ , where the symbols have their usual meanings.
8. What is a conservative forces? Give an example.
9. Distinguish between loudness and intensity of sound .
10. What are the advantages of the Periodic Table?
11. Explain the formation of Al 3+ ion and why is it formed?
12. What are the major divisions of the kingdom planate ? What is the basis of these divisions?
13. Explain giving reasons why:
(a) Balanced diet is necessary for maintaining heal thy body.
(b) Health of an organism depends upon the surround
ing environmental conditions.
(c) Our surrounding area should be free of stagnant water.
14. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
15. When a wave travels from one medium to another, the wavelength changes but not the frequency. The wavelength of sound disturbance 30 c m in air and of the wave velocity is 340 m/s. What will be the wavelength of this disturbanc e in Helium? The speed of sound in helium is 970 m/s and 1450 m/s in water?
16. Derive an expression for the kinetic energy at what height will its kinetic energy and potential energy be equal?
17. Nita’s mother fell ill and the doctor diagnosed her with pernicious anemia. She felt lethargic and did not have the energy to do work. Nita helped her mother in household work till she recovered.
Answer the following questions based on the above i nformation:
(i) Name the vitamin whose deficiency caused pernic ious anaemia.
(ii) What changes do you think the doctor might hav e made to her diet?
(iii) Mention the values shown by Nita.
18. List any three human activities that you think woul d lead to air pollution.
19. A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick? (b) what is the sickness ?
20. Describe the three main characteristics that are us ed for a hierarchical classification.
21. What types of energy transformation takes place in the following:
(i) Electric heater (ii) Solar battery (iii) Dynamo (iv) Steam engine and (v) Hydroelectric power station?
22. What is a mole? What is the unit of mole? How many molecules are there in a certain mass of a substance?
23.State the effect on the loudness and pitch of t he sound from the loudspeaker when:
(i) the amplitude increases but the frequency of th e sound stays the same.
(ii) the amplitude stays the same but the frequency increases.
24. Why is it necessary to conserve natural resources? How can they be conserved?
2. What is meant by the term chemical formula?
3. State the law of conservation of energy.
4. How would you choose between two characteristics to be used for developing a hierarchy in classification?
5. Why are the ceilings of concert halls curved?
6. What would happen if all the oxygen present in the environment is converted to ozone?
7. Prove that v= υ λ , where the symbols have their usual meanings.
8. What is a conservative forces? Give an example.
9. Distinguish between loudness and intensity of sound .
10. What are the advantages of the Periodic Table?
11. Explain the formation of Al 3+ ion and why is it formed?
12. What are the major divisions of the kingdom planate ? What is the basis of these divisions?
13. Explain giving reasons why:
(a) Balanced diet is necessary for maintaining heal thy body.
(b) Health of an organism depends upon the surround
ing environmental conditions.
(c) Our surrounding area should be free of stagnant water.
14. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
15. When a wave travels from one medium to another, the wavelength changes but not the frequency. The wavelength of sound disturbance 30 c m in air and of the wave velocity is 340 m/s. What will be the wavelength of this disturbanc e in Helium? The speed of sound in helium is 970 m/s and 1450 m/s in water?
16. Derive an expression for the kinetic energy at what height will its kinetic energy and potential energy be equal?
17. Nita’s mother fell ill and the doctor diagnosed her with pernicious anemia. She felt lethargic and did not have the energy to do work. Nita helped her mother in household work till she recovered.
Answer the following questions based on the above i nformation:
(i) Name the vitamin whose deficiency caused pernic ious anaemia.
(ii) What changes do you think the doctor might hav e made to her diet?
(iii) Mention the values shown by Nita.
18. List any three human activities that you think woul d lead to air pollution.
19. A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick? (b) what is the sickness ?
20. Describe the three main characteristics that are us ed for a hierarchical classification.
21. What types of energy transformation takes place in the following:
(i) Electric heater (ii) Solar battery (iii) Dynamo (iv) Steam engine and (v) Hydroelectric power station?
22. What is a mole? What is the unit of mole? How many molecules are there in a certain mass of a substance?
23.State the effect on the loudness and pitch of t he sound from the loudspeaker when:
(i) the amplitude increases but the frequency of th e sound stays the same.
(ii) the amplitude stays the same but the frequency increases.
24. Why is it necessary to conserve natural resources? How can they be conserved?
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