ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

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Question # 1

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

Question # 2

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 3

Compton was awarded Nobel prize in physics in

Question # 4

Converse of pair production is known as

Question # 5

According to the special theory of relativity, time is

Question # 6

Wave nature of particle was proposed by

Question # 7

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

Question # 8

There is no way to detect:

Question # 9

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

Question # 10

The photon of radio-waves has energy of about

Question # 11

The mass of an object will be doubled at speed

Question # 12

When a platinum wire is heated, it appears yellow at

Question # 13

The inside cavity of the black body is

Question # 14

Which one of the following physical quantities changes with relativistic speed

Question # 15

The existence of position was predicted by Dirace in

Question # 16

the dilation of time applies to the timing processes which are:

Question # 17

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

Question # 18

Electromagnetic -radiation means:

Question # 19

The special theory of relativity is based on the

Question # 20

The energy of a photon is represented by

Question # 21

Position was discovered by Carl Anderson in

Question # 22

The general theory of relativity treats problems involving

Question # 23

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

Question # 24

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 25

Which of the following phenomenon proves the particle nature of light

Question # 26

A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is

Question # 27

Wien's constant is measured in:

Question # 28

The year when A.H. compton was awarded Nobel Prize is:

Question # 29

The value of threshold frequency for different metals is

Question # 30

S.I. unit of planks constant is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
3 A photon is considered to have
A. Momentum
B. Energy
C. Wavelength
D. All of the above
4 According to the Max plank, energy is redialed or absorbed in
A. discrete packets
B. continuous waves
C. either of them
D. none of these
5 There is no way to detect:
A. Absolute uniform motion
B. Accelerated motion
C. State rest
D. State of motion
6 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
7 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
8 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
9 According to the special theory of relativity, a moving clock
A. runs faster
B. runs slower
C. neither runs faster nor slower
D. all of these
10 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928

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