1.
Define atomicity.
2. What is an ion?
3. Define average power.
4. In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and whi ch will have the largest number of organisms?
5. Which wave property determines(a) loudness, (b) pitch?
6. If there is no atmosphere around the Earth, what will happen to its temperature?
7. Establish the relation for a wave that velocity = frequency wavelength × .
8. State the difference between Power and energy?
9. What is SONAR? Write its working?
10. Why is atomic number is more important than atomic weight in predicting the chemical properties of elements?
11. Define valency by taking examples of silicon and oxygen.
12. What is classification? What is the need of classification? What is the basis of classification?
13. Explain giving reasons why:
(a) Balanced diet is necessary for maintaining health body.
(b) Health of an organism depends upon the surrounding environmental conditions.
14. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.
15. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies ? Take the speed of sound in air as 344 -1 ms .
16. In the force - displacement graph, calculate the wo rk done during
(a) the interval 0
(b) the interval 2
17. Government officials often go from one house to another every year and request people to take their infants to the Pulse Polio booths to administ er polio drops to them. However, in a particular colony there were six infants but only f our were taken to the booth.
Answer the following questions based on the above i nformation:
(i) Why does the Government take active part in adm inistrating polio drops to all infants?
(ii) What values are being ignored by people who do not take their infants to the pulse Polio booth?
(iii) Government officials go from house-to-house f or promoting polio drops vaccination. Besides doing their office duty, which values are p romoted through their actions?
18. Write in detail what happens when water gets pollut ed.
19. List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
20. Thallophyta, Bryophyta and Pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘Phanerogams’. Discuss wh y. Draw one example of a gymnosperm.
21. A light and a heavy object have the same momentum, find out the ratio of their kinetic energies. Which one has a larger kinetic energy?
22. State the Postulates of Dalton Theory?
23. Represent graphically any two separate diagrams in each case:
(i) Two sound waves having the same amplitude but d ifferent frequencies.
(ii) Two sound waves having the same frequency but different amplitudes. (iii) Two sound waves having different amplitudes a nd also different wavelengths.
24. How has industrialisation led to an increase in air pollution? What steps should be taken to check air pollution?
2. What is an ion?
3. Define average power.
4. In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and whi ch will have the largest number of organisms?
5. Which wave property determines(a) loudness, (b) pitch?
6. If there is no atmosphere around the Earth, what will happen to its temperature?
7. Establish the relation for a wave that velocity = frequency wavelength × .
8. State the difference between Power and energy?
9. What is SONAR? Write its working?
10. Why is atomic number is more important than atomic weight in predicting the chemical properties of elements?
11. Define valency by taking examples of silicon and oxygen.
12. What is classification? What is the need of classification? What is the basis of classification?
13. Explain giving reasons why:
(a) Balanced diet is necessary for maintaining health body.
(b) Health of an organism depends upon the surrounding environmental conditions.
14. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.
15. A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies ? Take the speed of sound in air as 344 -1 ms .
16. In the force - displacement graph, calculate the wo rk done during
(a) the interval 0
(b) the interval 2
17. Government officials often go from one house to another every year and request people to take their infants to the Pulse Polio booths to administ er polio drops to them. However, in a particular colony there were six infants but only f our were taken to the booth.
Answer the following questions based on the above i nformation:
(i) Why does the Government take active part in adm inistrating polio drops to all infants?
(ii) What values are being ignored by people who do not take their infants to the pulse Polio booth?
(iii) Government officials go from house-to-house f or promoting polio drops vaccination. Besides doing their office duty, which values are p romoted through their actions?
18. Write in detail what happens when water gets pollut ed.
19. List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
20. Thallophyta, Bryophyta and Pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘Phanerogams’. Discuss wh y. Draw one example of a gymnosperm.
21. A light and a heavy object have the same momentum, find out the ratio of their kinetic energies. Which one has a larger kinetic energy?
22. State the Postulates of Dalton Theory?
23. Represent graphically any two separate diagrams in each case:
(i) Two sound waves having the same amplitude but d ifferent frequencies.
(ii) Two sound waves having the same frequency but different amplitudes. (iii) Two sound waves having different amplitudes a nd also different wavelengths.
24. How has industrialisation led to an increase in air pollution? What steps should be taken to check air pollution?
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