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

Question # 2

The Stephen-Boltzmann law for the black body radiation is given by

Question # 3

A black body is

Question # 4

From the theory of relativity, momentum p of the photon is related to energy as

Question # 5

The concept of direction is purely:

Question # 6

Which of the following is not an example of intertial frame

Question # 7

When a platinum wire is heated, it appears white at

Question # 8

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

Question # 9

Electromagnetic radiation or photons interact with matter in

Question # 10

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 11

Practically the quantity v/c is always:

Question # 12

The general theory of relativity treats problems involving

Question # 13

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 14

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

Question # 15

A particle having mass and charge equal to that of an electron is called:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
2 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
3 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these
4 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
5 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
6 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
7 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
8 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
9 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
10 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928

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