Physics - Study Mode

[#1166] Parabolic mirrors are used in
Correct Answer

(A) Car headlights

Explanation

Solution: Parabolic mirrors are used in car headlights.

[#1167] Which alternative energy source is exhaustible?
Correct Answer

(D) Geothermal energy

Explanation

Solution: The alternative energy source which is exhaustible is geothermal energy.

[#1168] Which of the following is a Non Renewable Resource of Energy?
Correct Answer

(C) Natural Gas

Explanation

Solution: Most non-renewable energy sources are fossil fuels: coal, petroleum, and natural gas. Carbon is the main element in fossil fuels. For this reason, the time period that fossil fuels formed (about 360-300 million years ago) is called the Carboniferous Period.

[#1169] Which of the following is a renewable resource of energy?
Correct Answer

(D) All of the above

Explanation

Solution: All of the above are renewable resource of energy.

[#1170] The group of solar cells joined together in a definite pattern is called a
Correct Answer

(D) Solar cell panel

Explanation

Solution: A single solar cell can produce only a small amount of electricity. In those cases where more electrical power is needed, a large number of solar cells are joined in series. This group of solar cells is called a ‘solar cell panel’. Thus, a solar cell panel consists of a large number of solar cells joined together in a definite pattern.