EASY
Earn 100

Explain the example of energy conversion from light to chemical.

Important Questions on Work and Energy

EASY
Science>Physics>Work and Energy>Transformation of Energy
A marble P of mass m lies at rest on the edge of a perfectly horizontal surface of a table of height h, as shown in the figure. A second identical marble Q having same mass moving at a speed u strikes it perfectly elastically. The speed acquired by marble P after the collision is (In an elastic collision, momentum as well as kinetic energy are conserved)
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MEDIUM
Science>Physics>Work and Energy>Transformation of Energy

Name a machine that converts electrical energy into mechanical energy.

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Science>Physics>Work and Energy>Transformation of Energy
The temperature of the water at the bottom of a water fall is higher than that of the water at the top, because :
EASY
Science>Physics>Work and Energy>Transformation of Energy
In a simple Pendulum the displacement is equal to amplitude. Then kinetic energy will be
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Science>Physics>Work and Energy>Transformation of Energy
An electric motor converts:
EASY
Science>Physics>Work and Energy>Transformation of Energy
In any physical or chemical process, the total energy:
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Science>Physics>Work and Energy>Transformation of Energy
Describe in your words the law of conservation of energy.
EASY
Science>Physics>Work and Energy>Transformation of Energy
State the energy changes in the case of a ceiling fan while in use.
HARD
Science>Physics>Work and Energy>Transformation of Energy
Name the device that converts electrical energy into mechanical energy. Draw its diagram and label the parts.
EASY
Science>Physics>Work and Energy>Transformation of Energy
Which device is used to convert mechanical energy into electrical energy? Draw a neat diagram and label the parts of this device.
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Science>Physics>Work and Energy>Transformation of Energy
An electric device which converts electric energy into mechanical energy is called
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Science>Physics>Work and Energy>Transformation of Energy
State the energy changes in the case of an electric iron while in use.
EASY
Science>Physics>Work and Energy>Transformation of Energy
What do you understand by the term 'transformation of energy'? Explain with an example.
MEDIUM
Science>Physics>Work and Energy>Transformation of Energy
State and explain the law of conservation of energy. Explain with an example.
EASY
Science>Physics>Work and Energy>Transformation of Energy

Name a device or gadget which converts: Heat energy to mechanical energy.

EASY
Science>Physics>Work and Energy>Transformation of Energy

Name the appliances which work under the following energy transformation.

a. Sound energy into electrical energy.

b. Heat energy into mechanical energy.

 

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Science>Physics>Work and Energy>Transformation of Energy
What is the form of energy transformation in a microphone? 
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Science>Physics>Work and Energy>Transformation of Energy
Name the sequence of energy changes taking place in setting a truck in motion.
EASY
Science>Physics>Work and Energy>Transformation of Energy
Mention how energy changes from one form to the other in a thermal power station.
HARD
Science>Physics>Work and Energy>Transformation of Energy
State the law of conservation of energy. Prove that energy remains conserved for a freely falling mass m.