Energy Test - 7...

In bringing a charge of 10 milli coulombs from infinity to a point at which potential is 12v, work done is-

A pendulum rocks back and forth. In an ideal setting, this motion would go on perpetually without loss of mechanical energy. Realistically, if you held a pendulum up and made it go in motion, it would slow to a stop.

What is responsible for the pendulum gradually losing mechanical energy? Ignore the mass of the string holding the pendulum bob in motion.

In an electric motor, the conversion of energy that takes place is:

A battery, left idle is-

Which of the following statement is not correct?

The capacity of a body is called ______ .

Energy is-

A ball is placed on a compressed spring. On releasing the spring, the ball flies away. Then which of the following is not incorrect?

Conversion by electric heater is-

Water falls from a height 500 m. What will be the rise in temperature of water at bottom if whole energy remains in the water?

If the amount of heat of a system is given 35 J so work done on the system is 15J, so change in internal energy of the system is-

The device which converts electrical energy into heat energy is called-

in a hydroelectric power plant more electrical power can be generated when water falls from a greater height due to-

A helicopter takes off from the ground and rises vertically. It then hovers at a constant height above the ground.

Energy changes takes place during the gain in height, sequence will be-

A ball of mass 7kg and another of mass 21kg are dropped together from a 60 feet tall building. What will be the ratio of their kinetic energy after a fall of 30 feet?