(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

State four ways for the judicious use of energy.

MULTIPLE CHOICE TYPE:

The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun

Renewable source of energy is:

Name two examples in which the mechanical energy of a system remains constant.

A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s⁻²).

Name the energy changes for the following:
electric ball 

Name the energy changes for the following:
 bicycle brakes

Name the energy change for the following:

pendulum

Name the energy changes for the following 
human body    

Name the energy changes for each of the following cases:
 dynamo

The following are some of the energy transformations.
A. Electrical to light
B. Work to heat
C. Chemical to light
D. Electrical to sound
E. Mechanical to electrical
Identify the energy transformation that takes place in the following by inserting the corresponding letter in the shape provided.
(i)    A candle flame                       
(ii)    A torch is lighted                    
(iii)    A microphone is used in a meeting
(iv)    A cycle dynamo                        
(v)    A piece of metal is being filed 

Identify the type of energy possessed by the body in the following:

A coiled spring of the toy car.