ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

Try The MCQ's Test For ECAT Physics Chapter 19 Dawn of Modern Physics

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ECAT Physics Chapter 19 Dawn of Modern Physics

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Question # 1

In photoelectric effect the energy of ejected electrons depend on

Question # 2

The energy of the 4th orbit in hydrogen atom is

Question # 3

The nature of radiations emitted by a hot body depends upon its:

Question # 4

Position was discovered by Carl Anderson in

Question # 5

The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is

Question # 6

There is no way to detect:

Question # 7

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 8

A photon is considered to have

Question # 9

Which one of the following physical quantities changes with relativistic speed

Question # 10

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 11

In order to produce pair production, a photon must have a energy

Question # 12

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 13

The unit of work function is:

Question # 14

The value of threshold frequency for different metals is

Question # 15

Converse of pair production is known as

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
2 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
3 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
4 A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m
5 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
6 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of
A. 2 cm/s
B. 20 cm/s
C. 200 cm/s
D. 2000 cm/s
9 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
10 The energy of a photon is represented by
A. h/c2
B. h/T
C. hc2
D. hf/c2

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