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a merry go round wiht radius of 10cm, has a rotational inertia of 20kgm^2 and an angular speed of 7 rad/s. A person steps on to the edge of the merry go round and teg angular speed decreases to 3 rad/s. What is the rotational inertia of the merry go round and person



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Answer:

1. Which one of the following statements is incorrect about the nitrogen cycle?

A. nitrogen is the most abundant gas in the atmosphere

B. atmospheric nitrogen is less reactive

C. the process of releasing nitrogen gas back into the atmosphere is called fixation

D. lightning converts atmospheric nitrogen into nitrogen oxides

2. What makes the phosphorus cycle different from the nitrogen and carbon cycles?

A. The phosphorus cycle is very slow

B. Phosphorus cannot be found in the atmosphere in the gaseous state

C. It is not an essential element for plants and animals

D. $a$ and $b$

3. Which of the following processes fix atmospheric carbon dioxide?

A. Photosynthesis

C. Burning of fossil fuels

B. Respiration

D. $b$ and $c$

4. One of the following is Naturally Occurring Greenhouse Gas?

A. Nitrous oxide

C. Methane

B. Carbon dioxide

D. Ethane

5. The result of ozone hole is

A. Acid rain

C. Global warming

B. The UV radiations the earth

D. Greenhouse effect

6. Which of the following gases contribute to the global warming?

A. Carbon monoxide

C. Sulphur dioxide

B. Carbon dioxide

D. Nitrogen dioxide

7. Which of the following is an example of impact of development activities hydrosphere?

A. Air pollution

C. Soil pollution

B. Soil erosion

D. Water pollution

8. What is the source of carbon monoxide?

A. Incomplete burning of wood

C. Fuels

B. Exhaust fumes of motor vehicles

D. All of above

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