ICSE CLASS X Boards Revison MCQs with Solutions | Physics WORK,POWER,ENERGY Chapter 2 | 2021 Semester 1

 

 

 

1 . A catapult throws a stone of mass 0.10 kg with a velocity of 30 m/s. If 25% of the P.E. of the elastic band is wasted during transmission, find the magnitude of the potential energy.

2. In a hydroelectric power station, 1000 kg of water is allowed to drop a height of 100 min 1 s. If the conversion of potential energy to electric energy is 60%, calculate the power output.

3. The heart of a deer chased by a tiger beats 200 times in a minute and does a work of 1.4 joules per beat. What is the power of heart?

4. An accelerated electron has energy of 9.6 * 10^(-19) J. Express energy in electron volts (eV).