मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

Work done by a boy depends on the time in which he does work.

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प्रश्न

Work done by a boy depends on the time in which he does work.

पर्याय

  • True

  • False

MCQ
चूक किंवा बरोबर
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उत्तर

 False.

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पाठ 4: Energy - Objective questions [पृष्ठ ७६]

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सेलिना Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Objective questions | Q 1.4 | पृष्ठ ७६

संबंधित प्रश्‍न

A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)


A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.


Choose one or more correct alternatives.

For work to be performed, energy must be ______.

  1. transferred from one place to another
  2. concentrated
  3. transformed from one type to another
  4. destroyed

Is the motion of moon around the earth in circular path an accelerated motion?


Name the physical quantity whose MKS units are kgm2s-3.


Give an example 
Chemical energy changes to heat energy.


How is horse power related to the S. I. unit of power?


A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?


A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.


A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.


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