ECAT Pre Computer Science Chapter 19 MCQ Test With Answer

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 unit of work function is:

Question # 2

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

Question # 3

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

Question # 4

When platinum wire is heated, it appears cherry red at

Question # 5

de-Broglies hypthesis was experimentally verified by

Question # 6

Absolute motion cannot be detected

Question # 7

0.1 kg mass will be equivalent to the energy

Question # 8

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

Question # 9

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

Question # 10

Converse of pair production is known as

Question # 11

When a platinum wire is heated, it appears white at

Question # 12

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

Question # 13

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 14

The concept of direction and position are purely

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
3 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
4 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
5 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
6 S.I. unit of planks constant is
A. J-s-1
B. J.s
C. J.s-2
D. J.s2
7 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
8 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
9 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
10 The Nobel Prize on the explanation of photoelectric effect was awarded to:
A. Max. Planck
B. Maxwell
C. Bohr
D. Rutherford

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