ECAT Pre Engineering Physics Chapter 19 MCQ Test With Answer

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

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Physics ECAT Pre Engineering Chapter 19 Dawn of Modern Physics

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Question # 1

Davision and Germer performed experiment to verify

Question # 2

The Nobel Prize on the explanation of photoelectric effect was awarded to:

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

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

Question # 5

Photoelectrons are emitted when ultraviolet light falls on:

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

According to the de-Brogile relation, an object of large mass and ordinary speed has

Question # 10

With the help of 50 K v electron microscope, a resolution of

Question # 11

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

Question # 12

When low energy photon interact with a metal,which of the following effect is likely to be taken place

Question # 13

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

Question # 14

Newton's law of motion do not hold in

Question # 15

According to the special theory of relativity

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Sr.# Question Answer
1 The special theory of relativity treats problems invoving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
2 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
3 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
4 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
5 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
6 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
7 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
8 The concept of direction and position are purely
A. absolute
B. relative
C. absolute or relative
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 Converse of pair production is known as
A. Compton effect
B. annihilation of matter
C. photoelectric effect
D. none of these
11 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
12 The idea of quantization of energy was proposed by:
A. Einstein
B. Max.Planck
C. Maxwell
D. Bohr
13 In the compton's effect, it is found that the wavelength of incident x-rays is
A. greater than the wavelength of scattered x-rays
B. equal to the wavelength of scattered x-rays
C. less than the wavelength of scattered x-rays
D. any one of these
14 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
15 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

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