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

Converse of pair production is known as

Question # 2

Compton was awarded Nobel prize in physics in

Question # 3

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 4

The general theory of relativity treats problems involving

Question # 5

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Question # 6

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 7

When platinum wire is heated, it appears cherry red at

Question # 8

The way through which electromagnetic radiations or photons interact with matter depends upon their:

Question # 9

Victor de-Brogile received the Nobel prize in physics in

Question # 10

The inside cavity of the black body is

Question # 11

There is no way to detect:

Question # 12

Practically the quantity v/c is always:

Question # 13

Davision and Germer performed experiment to verify

Question # 14

The concept of direction is purely:

Question # 15

As the light shines on the metal surface, the electrons are ejected

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
2 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the
A. number of photoelectrons
B. size of the photoelectrons
C. charge on photoelectrons
D. K.E of photoelectrons
3 With the help of 50 K v electron microscope, a resolution of
A. 0.5 to 1 m to possible
B. 1 m to 10 m is possible
C. 0.5 to 1 nm is possible
D. 1 to 10 nm is possible
4 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
5 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
6 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
7 If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
A. 2.120°A
B. 0.212°A
C. 21.2°A
D. 0.14°
a
8 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson
9 The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
A. Lummer
B. Planck
C. Pringsheim
D. Both (A ) and (B)
10 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo

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