set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

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.

Question : 4

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.

a) 2-3-1

b) 3-2-1

c) 1-2-3

d) 1-3-2

Question : 5

________ is used as a fuel in space ships.

a) Alcohol

b) Petrol

c) Hydrogen

d) Diesel

Question : 6

Einstein’s photoelectric equation states that hν = $W_0 + E_k$ in this equation, $E_k$ refers to the

a) Mean kinetic energy of the emitted electrons

b) Maximum kinetic energy of the emitted electrons

c) Kinetic energy of all the emitted electrons

d) Minimum kinetic energy of the emitted electrons