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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Write True Or False Potential Energy Changes into Kinetic Energy When It is Put to Use

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प्रश्न

Write true or false of the following statement.

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

विकल्प

  • True

  • False

MCQ
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उत्तर

True.

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अध्याय 3: Energy - Objective Questions

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एस.एस. शोम Concise Physics [English] Class 7 ICSE
अध्याय 3 Energy
Objective Questions | Q 1.4

संबंधित प्रश्न

State the unit of energy and define it.


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

What is energy?


Define the term efficiency of a machine.


Answer the following in a word or two or in a sentence.

Write the formula for calculating the efficiency of a machine.


Give a reason for the following.

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


Define the term 'watt'.


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.

The capacity that an object has for doing work is called ______.


A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)


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