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

The inside cavity of the black body is

Question # 2

At the temperature, a body emits radiation which is principally

Question # 3

Victor de-Brogile received the Nobel prize in physics in

Question # 4

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

Question # 5

According to the Max plank, energy is redialed or absorbed in

Question # 6

A black body is

Question # 7

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

Question # 8

In the compton's effect, it is found that the wavelength of incident x-rays is

Question # 9

Photoelectrons are emitted when ultraviolet light falls on:

Question # 10

The photoelectric effect, the maximum energy of photoelectrons depends on the

Question # 11

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

Question # 12

When a position comes close to an electron they annihilate into photons such that

Question # 13

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

Question # 14

The existence of position was predicted by Dirace in

Question # 15

Compton was awarded Nobel prize in physics in

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ECAT Chapter 19 Important MCQ's

Sr.# Question Answer
1 The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
A. 500 m
B. 500 nm
C. 500 km
D. 500 cm
2 As the light shines on the metal surface, the electrons are ejected
A. slowly
B. instantaneously
C. either of these
D. none of these
3 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 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
6 According to Einstein, with the great increase in the speed of the body the relativistic length of the body
A. Remains constant
B. Decreases
C. Increases
D. Reduces to zero
7 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford
8 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
9 A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
A. decreases
B. first increases then decreases
C. increases
D. any one of them
10 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

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