मराठी

The work done on an object does not depend upon the - Science

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प्रश्न

The work done on an object does not depend upon the

पर्याय

  • displacement

  • force applied

  • the angle between force and displacement

  • the initial velocity of the object

MCQ
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उत्तर

initial velocity of the object

Explanation:

The work done on an object does not depend upon the initial velocity of the object.

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पाठ 11: Work and Energy - Multiple Choice Questions [पृष्ठ ६९]

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एनसीईआरटी एक्झांप्लर Science [English] Class 9
पाठ 11 Work and Energy
Multiple Choice Questions | Q 7. | पृष्ठ ६९

संबंधित प्रश्‍न

Write true or false of the following statement.

Potential energy changes into kinetic energy when it is put to use


Select the correct alternatives

When we rub our hands


What do you mean by conservation of mechanical energy? State the condition when does it hold.


Match the following:

 Column A   Column B
(a) Needle (1) class II lever
(b) Doorknob (2) inclined plane
(c) Ramp  (3) Class I lever
(d) Lemon crusher (4) Wheel and axle 
(e) Seesaw (5) wedge

Tick the most appropriate answer.

The force applied on a machine to do work is called the


Answer the following in short.

What do you understand by the term efficiency of a machine’?


Give a reason for the following.

The efficiency of a machine is always less than 100%.


How many joules are there in one kilowatt-hour?


Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).


Study the following activity and answer the questions.
  1. Take two aluminium channels of different lengths.
  2. Place the lower ends of the channels on the floor and hold their upper ends at the same height.
  3. Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
Questions:
  1. At the moment of releasing the balls, which energy do the balls have?
  2. As the balls roll down which energy is converted into which other form of energy?
  3. Why do the balls cover the same distance on rolling down?
    Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"?
  4. What is the form of the eventual total energy of the balls?
  5. Which law related to energy does the above activity demonstrate? Explain.

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