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An electric heater converts electrical energy into sound energy.

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Important Questions on Temperature and Its Measurement

MEDIUM
Science>Physics>Temperature and Its Measurement>Heat and Temperature

Name a machine that converts electrical energy into mechanical energy.

EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
Describe in your words the law of conservation of energy.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
In a simple Pendulum the displacement is equal to amplitude. Then kinetic energy will be
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
State the energy changes in the case of a ceiling fan while in use.
HARD
Science>Physics>Temperature and Its Measurement>Heat and Temperature
Name the device that converts electrical energy into mechanical energy. Draw its diagram and label the parts.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
In any physical or chemical process, the total energy:
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
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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EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
Which device is used to convert mechanical energy into electrical energy? Draw a neat diagram and label the parts of this device.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
An electric motor converts:
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
State the energy changes in the case of an electric iron while in use.
MEDIUM
Science>Physics>Temperature and Its Measurement>Heat and Temperature

Name the energy transfer which occur when a torch is on.

EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
Name the energy transfer which occur when there is a picture on a television screen.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
What do you understand by the term 'transformation of energy'? Explain with an example.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
Describe the energy transformations that take place when a ball is thrown up in the air, reaches the maximum height, descends and finally hits the ground.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature

Name the energy transfer which occur when someone speaks into a microphone.

EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature

Name the appliances which work under the following energy transformation.

a. Sound energy into electrical energy.

b. Heat energy into mechanical energy.

 

MEDIUM
Science>Physics>Temperature and Its Measurement>Heat and Temperature
What kind of energy transformations take place at a coal-based thermal power station?
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature
State the energy change in the battery, when it is connected to an electric bulb.
EASY
Science>Physics>Temperature and Its Measurement>Heat and Temperature

Where does a pendulum have maximum 

a. potential energy and 

b. kinetic energy.

MEDIUM
Science>Physics>Temperature and Its Measurement>Heat and Temperature
State and explain the law of conservation of energy. Explain with an example.