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

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

Question # 2

Which of the following is not an example of intertial frame

Question # 3

Davision and Germer performed experiment to verify

Question # 4

The value of threshold frequency for different metals is

Question # 5

The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be

Question # 6

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

Question # 7

The unit of work function is:

Question # 8

Absolute motion cannot be detected

Question # 9

Electromagnetic -radiation means:

Question # 10

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

Question # 11

According to the special theory of relativity, time is

Question # 12

Which one of the following physical quantities changes with relativistic speed

Question # 13

A black body is

Question # 14

The special theory of relativity is based on:

Question # 15

In photoelectric effect the energy of ejected electrons depend on

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
2 Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
A. Energy only
B. Momentum only
C. Mass only
D. Charge only
3 The general theory of relativity treats problems involving
A. inertial frame of references
B. accelerating frame of references
C. both of these
D. none of these
4 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
5 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
6 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
7 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
8 According to the de-Brogile relation, an object of large mass and ordinary speed has
A. very small wavelength
B. very large wavelength
C. very small frequency
D. all of these
9 Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
A. photoelectric effect
B. pair production
C. Compton effect
D. uncertainty principle
10 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
A. pair production
B. Compton effect
C. photoelectric effect
D. relativity

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