Everyday Science · Physics in Everyday Life · page 5 of 21
Work & Energy MCQs with Answers
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- 41.
A wire of initial length L and radius r is stretched by a length l, another wire of same material but with initial length 2L and radius 2r is stretched by length 2l. The ratio of the stored elastic energy per unit volume in the first and second wire is _?
- 42.
The work done by a constant source of 1 kW power (that is 1000 J per second) in one hour is _?
- 43.
Which of the following is an example of the law of conservation of energy?
- 44.
If a force of 6N displaces an object 2m in the direction of force, then work done will be ?
- 45.
Kilowatt hour is a unit of which physical quantity?
- 46.
If the room is air tight the heat absorption at constant volume is 1.4 × 10⁶ J and delivers the power of 2 KW, the time to provide the energy is _?
- 47.
The potential energy of a certain spring when stretched through a distance 'S' is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance 'S' will be _?
- 48.
A 100 kg man runs up a hill through a height of 4 m in seconds. How much work does he do against gravitational force?
- 49.
A nurse is pushing a wheelchair with an 80 kg patient sitting on it. How much work is done by the patient's weight?
- 50.
The heat energy dissipated by a 40-watt heater in 1 hour is?