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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

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

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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

उत्तर

 False.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
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

State the S.I. unit of energy.


1 J = ______ calorie.


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 vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)


A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


What are the quantities on which the amount of work done depends? How are they related to work?


Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.


A boy does work when he pushes against a brick wall. (yes/no).


Write an expression for the work done against gravity.


Give two examples of kinetic energy.

Name the physical quantity which is equal to the energy of a body.

What are the physical parameters on which the kinetic energy of a body depends?

What type of energy is possessed by a flowing water?

Is P.E. a vector or a scalar quantity?

Define the unit 'watt'. How is it related to horse power?

The truck has to apply a force of 3000 N to overcome friction while moving with a uniform speed of 36 kmhr-1. What is the power developed by the truck?

(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?


If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Suma is swimming in a pond.


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