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

If a material object moves with the speed of light 'C' its mass becomes

Question # 2

The energy of photon 'E' is proported to

Question # 3

Photoelectric effect takes place with a photon of:

Question # 4

Which of the following phenomenon proves the particle nature of light

Question # 5

According to the special theory of relativity, a moving clock

Question # 6

The special theory of relativity is based on:

Question # 7

0.1 kg mass will be equivalent to the energy

Question # 8

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

Question # 9

If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be

Question # 10

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

Question # 11

When a platinum wire is heated, it appears orange red at

Question # 12

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

Question # 13

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

Question # 14

The mass of an object will be doubled at speed

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in
A. 1916
B. 1919
C. 1921
D. 1923
2 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
3 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
4 The special theory of relatively treats the problems involving:
A. Inertial frames of reference
B. Non-inertial frames
C. Non-accelerated frame
D. Botha (A) and (C)
5 The way through which electromagnetic radiations or photons interact with matter depends upon their:
A. Wavelength
B. Frequency
C. Energy
D. Temperature
6 Max plank received the Nobel Prize in physics for his discovery of energy quanta in
A. 1900
B. 1906
C. 1912
D. 1918
7 If a material object moves with the speed of light 'C' its mass becomes
A. Equal to its rest mass
B. Four times of its rest mass
C. Double of its rest mass
D. Infinite
8 Compton was awarded Nobel prize in physics in
A. 1921
B. 1923
C. 1925
D. 1927
9 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
10 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
A. maximum frequency
B. minimum frequency
C. threshold frequency
D. all of these

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