21)

Geothermal energy is

A)

Heat energy in the interior of earth

B)

energy of molten mars exists in the farm of magma inside the earth.

C)

molten lava on the surface of earth

D)

energy obtained from solar thermal electric plants

22)

In a hydropower plant

A)

Potential energy possessed by stored water is converted into electricity

B)

Kinetic energy possessed by stored water is converted into potential energy

C)

Electricity is extracted from water

D)

Water is converted into steam to produce electricity.

23)

Which is the ultimate source of energy?

A)

Water

B)

Sun

C)

Uranium

D)

Fossil fuels

24)

Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?

A)

Nuclear energy

B)

Thermal energy

C)

Solar energy

D)

Geothermal energy

25)

Ocean thermal energy is due to

A)

energy stored by waves in the ocean

B)

temperature difference at different levels in the ocean

C)

pressure difference at different levels in the ocean

D)

tides arising out in the ocean

26)

The major problem in harnessing nuclear energy is how to

A)

split nuclei?

B)

sustain the reaction?

C)

dispose off spent fuel safely?

D)

convert nuclear energy into electrical energy?

27)

Which part of the solar cooker is responsible for green house effect?

A)

Coating with black colour inside the box

B)

Mirror

C)

Glass sheet

D)

Outer cover of the solar cooker

28)

A good fuel should possess

A)

high ignition temperature

B)

moderate ignition temperature

C)

high calorific value

D)

both high calorific value and moderate ignition temperature

29)

The variety of coal which has the highest car-bon content

A)

Anthracite

B)

Peat

C)

Bituminous

D)

Lignite

30)

Which of the following is the ultimate source of energy?

A)

Water

B)

Sun

C)

Fossil fuels

D)

Uranium