set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Audio signal cannot be transmitted because

a) the signal cannot be amplified for distance communication

b) the transmitting antenna length is very small to design

c) the signal has more noise

d) the transmitting antenna length is very large and impracticable

Question : 2

Match List-I with List-II and select the correct answer using the code given below the lists.

a) A – 4 ; B – 2 ; C – 3 ; D – 1

b) A – 2 ; B – 1 ; C – 4 ; D – 3

c) A – 3 ; B – 4 ; C – 1 ; D – 2

d) A – 2 ; B – 4 ; C – 1 ; D – 3

Question : 3

Geothermal energy is

a) energy stored as heat in the earth

b) amount of energy obtained from coal and petroleum inside earth crust.

c) energy of magma inside the earth crust

d) amount of minerals obtained from earth crust

Question : 4

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)

Question : 5

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.

a) 2 and 3

b) 1 and 3

c) 1 and 2

d) 1, 2 and 3

Question : 6

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