(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

Figure (a) shows the displacement-time graph for the motion of a body. Use it to calculate the velocity of the body at t = 1 s, 2 s and 3 s, and then draw the velocity-time graph in Figure (b) for it.

(a)	(b)

What is meant by the renewable and non-­renewable sources of energy? State two differences between them, giving two examples of each

Select the renewable and non-renewable sources of energy from the following :

1. Coal
2. Wood
3. Water
4. Diesel
5. Wind
6. Oil

Why is the use of wood as a fuel not advisable although wood is a renewable source of energy?

Name five renewable and three non-renewable sources of energy.

Renewable source of energy is :

What is meant by the efficient use of energy?

State two ways to save the energy.

How does the proper insulation of home save energy?

Which of the following device is most efficient for the lighting purpose?

LED, CFL, fluorescent tube light, Electric bulb.

Give an example to explain that the use of modem eco-friendly technology is more efficient and less polluting.

Describe three ways for the efficient use of energy.

What social initiatives must be taken for the sensitive use of energy?

The most non-polluting and efficient lighting device is :

IEA is the short form of :

Why should we conserve the non-renewable sources of energy?

State the main difference between the renewable and non-renewable sources of energy.

Explain why is it no wise to regard wood as a renewable sources of energy.

Why are fossil fuels called non-renewable sources of energy?

Why is charcoal considered better fuel than wood?