हिंदी
सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Power spent by a body depends on the time for which it does work. - Physics

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प्रश्न

Power spent by a body depends on the time for which it does work.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य

उत्तर

True.

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अध्याय 4: Energy - Objective questions [पृष्ठ ७६]

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सेलिना Concise Physics [English] Class 8 ICSE
अध्याय 4 Energy
Objective questions | Q 1.5 | पृष्ठ ७६

संबंधित प्रश्न

When do we say that work is done?


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

A sailboat is moving due to wind energy.


Why is a jack screw provided with a long arm?


A coolie does no work against the force of gravity while carrying a luggage on a road.


State the S.I. unit of energy.


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)


Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.


How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.


Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.


Nm is the unit of .......


Complete the following sentences:

 1 H.P. = ........ W.


Give two examples of kinetic energy.

Write the S.I. units of power.

What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.


In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?


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.


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

An engine is pulling a train.


A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.


A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?


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