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

Due to relative motion of observer and the frame of reference of events, time always:

Question # 2

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

Question # 3

When a platinum wire is heated, it appears orange red at

Question # 4

S.I. unit of planks constant is

Question # 5

A photon is considered to have

Question # 6

The value of the Stephen's constant for black body radiations is given by

Question # 7

The concept of direction and position are purely

Question # 8

If a material object moves with the speed of light 'C' its mass becomes

Question # 9

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 10

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

Question # 11

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 12

When a platinum wire is heated, it appears dull red at about

Question # 13

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

Question # 14

When the atomic particle are moving with velocities approaching that of light:

Question # 15

G.P. Thomson observer experimentally that electrons and neutrons possess

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The value of the Stephen's constant for black body radiations is given by
A. 5.6 x 108Wm-2K-4
B. 5.67 x 10-8Wm-2K-4
C. 2.9 x 10-3mK
D. 2.9 x 103mK
2 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
3 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
4 From the theory of relativity, momentum p of the photon is related to energy as
A. p = hfc
B. p = hf/c
C. p = f(hc,f)
D. p = cf/h
5 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
6 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
7 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
8 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
9 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
10 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate

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