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प्रश्न
What is the difference between renewable and non-renewable resources?
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उत्तर
| Renewable Sources | Non-renewable Sources |
| 1. The resources that can be renewed by reproduction are called renewable resources. | 1. The resources that are present in fixed quantities are called non-renewable. |
| 2. Renewable resources are inexhaustible. | 2. Non-renewable resources are exhaustible. |
| 3. Renewable resources are not affected by human activities. | 3. Non-renewable resources are affected by human activities. |
| 4. They are the non-conventional sources. | 4. They are the conventional sources. |
| 5. Example: Wind energy, solar energy, and hydro energy. | 5. Example: Coal, petroleum, and natural gas. |
संबंधित प्रश्न
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Give reasons for the following. No work is done if a man is pushing against a wall.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
In case of negative work, the angle between the force and displacement is :
Give two examples of work done.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
