set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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

Question : 3

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 : 4

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

Question : 5

The active component in an IC are

a) Capacitors

b) Transistors and diodes

c) Resistors

d) None of these

Question : 6

Which one of the following is correct? The wavelength of the X-rays

a) is longer than the wavelength of the yellow sodium light

b) is longer than the wavelength of radio waves

c) is longer than the wavelength of sound waves

d) is of the order of 0.1 nanometer