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

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

Question # 2

There is no way to detect:

Question # 3

Which one of the following physical quantities changes with relativistic speed

Question # 4

When a platinum wire is heated, it appears white at

Question # 5

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

Question # 6

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 7

Compton was awarded Nobel prize in physics in

Question # 8

Which of the following is not an example of intertial frame

Question # 9

The value of the plank's constant 'h' is given by

Question # 10

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

Question # 11

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 12

The concept of direction and position are purely

Question # 13

Davision and Germer performed experiment to verify

Question # 14

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

Question # 15

Photoelectrons are emitted when ultraviolet light falls on:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these
2 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
A. thermoionic electrons
B. free electrons
C. photoelectrons
D. slow electrons
3 Which of the following is not an example of intertial frame
A. a body placed on the surface of earth
B. a body placed in a car moving with uniform velocity
C. a body placed in a car moving with same acceleration
D. none of these
4 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4
5 Which of the following phenomenon proves the particle nature of light
A. interference
B. diffraction
C. photoelectric effect
D. none of these
6 An inertial frame is that frame in which
A. a>0
B. a=0
C. a<0
D. none of these
7 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1
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 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935
10 Practically the quantity v/c is always:
A. less than one
B. Equal to one
C. Greater then one
D. all of these

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