Modern And Space Physics, Sources Of Energy - Category Wise Question And Answer Practice Test With Solutions

Question : 16 [NDA]

Sun emits energy in the form of electromagnetic radiation. The following help in the generation of solar energy. Arrange them in the right sequence beginning from the starting of the cycle :

1. Hydrogen is converted to helium at very high temperatures and pressures.
2. The energy finds its way to sun's surface.
3. A vast quantity of energy is generated by nuclear fusion.

Select the correct answer using the code given below.

a) 2-3-1

b) 3-2-1

c) 1-2-3

d) 1-3-2

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Question : 17

An AM broadcasting station has a vertical telescopic transmitting antenna and a receiver has a vertical telescopic antenna. The receiver will respond to:

a) Magnetic component of the electromagnetic wave produced by antenna

b) Both electric and magnetic components of the electromagnetic wave produced by antenna

c) Electric component of the electromagnetic wave produced by antenna

d) 50% of both components of the electromagnetic wave produced by antenna

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Question : 18

Consider the following statements :

1. Short wave bands are used for transmission of radio waves to a large distance.
2. Short waves are reflected by ionosphere.
3. A pure semiconductor has negative temperature coefficient of resistance.

Which of the above statements are correct?

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

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Question : 19

Select the correct answer using the codes given below the lists: Code (A) (B) (C) (D)

a) (A) → (2); (B) → (1); (C) → (4); (D) → (3)

b) (A) → (3); (B) → (1); (C) → (2); (D) → (4)

c) (A) → (3); (B) → (2); (C) → (1); (D) → (4)

d) (A) → (4); (B) → (2); (C) → (3); (D) → (1)

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Question : 20

Tidal energy is a

a) form of energy which is obtained from the river in the form of tidal waves

b) form of energy which is obtained from the lake in the form of tidal waves

c) form of energy obtained from kinetic energy of moving ocean water

d) form of energy which is obtained from the ocean in the form of tidal waves.

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