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 energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

Question # 2

Victor de-Brogile received the Nobel prize in physics in

Question # 3

de-Broglies hypthesis was experimentally verified by

Question # 4

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

Question # 5

As the light shines on the metal surface, the electrons are ejected

Question # 6

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

Question # 7

According to the special theory of relativity, time is

Question # 8

G.P. Thomson observer experimentally that electrons and neutrons possess

Question # 9

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

Question # 10

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

Question # 11

The photon of radio-waves has energy of about

Question # 12

Intensity of light determines the:

Question # 13

According to the special theory of relativity, a moving clock

Question # 14

When a position comes close to an electron they annihilate into photons such that

Question # 15

The concept of direction and position are purely

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by
A. Max plank
B. Newton
C. Einstein
D. J.J. Thomson
2 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
3 The value of threshold frequency for different metals is
A. different
B. same
C. may be different or may be same
D. none of these
4 Which one of the following physical quantities changes with relativistic speed
A. Length
B. Mass
C. Time
D. All of the above
5 When a platinum wire is heated, it appears yellow at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
6 According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
A. Remains constant
B. Decreases
C. Increases to infinity
D. Reduced to zero
7 A black body is
A. an ideal absorber
B. an ideal radiator
C. both of them
D. none of them
8 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
9 Newton's law of motion do not hold in
A. an accelerated frame of reference
B. an unaccelerated frame of reference
C. both of these
D. none of these
10 The unit of work function is:
A. Joule
B. Electron volt
C. That of threshold frequency
D. Both (A) and (B)

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