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

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

Question # 2

Which of the following is not an example of intertial frame

Question # 3

In photoelectric effect the energy of ejected electrons depend on

Question # 4

The special theory of relativity treats problems invoving

Question # 5

When platinum wire is heated, it appears cherry red at

Question # 6

An intertial frame of reference is a frame of reference which is

Question # 7

Absolute motion cannot be detected

Question # 8

The special theory of relativity is based on:

Question # 9

The energy of the 4th orbit in hydrogen atom is

Question # 10

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

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

According to the special theory of relativity

Question # 15

If a body reaches a speed equal to the speed of light, then its mass will became

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Absolute motion cannot be detected
A. in its own frame of references
B. in a different frame of references
C. both in its frame and different frame of references
D. none of these
2 The special theory of relativity is based on:
A. Four postulates
B. Three postulates
C. Two postulates
D. One postulate
3 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)
4 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
5 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
A. classical mechanics
B. Newtonian mechanics
C. quantum mechanics
D. statistical mechanics
6 An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is
A. 1.66 x 10-29m
B. 1.74 x 10-10cm
C. 17.4 x 10-6m
D. 1.74 x 10-10m
7 When platinum wire is heated, then at the temperature of 500 oC, it becomes:
A. Yellow
B. Orange red
C. Dull red
D. White
8 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
9 If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:
A. Newton
B. Joule
C. Joule-Sec
D. Joule-s-1
10 At the temperature, a body emits radiation which is principally
A. of long wavelengths in the visible region
B. of long wavelengths in the invisible infrared region
C. of short wavelength in invisible ultraviolet region
D. none of these

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