Advertisements
Advertisements
Question
State two advantage of producing hydroelectricity.
Advertisements
Solution
Advantages of producing the hydroelectricity:
1. It does not produce any environmental pollution.
2. It is a renewable source of energy.
RELATED QUESTIONS
An electron emitter must have _____________ work function and ___________ melting point.
What are the two kinds of mechanical energy?
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Give two examples of work done.
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
What is the difference between renewable and non-renewable resources?
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
