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

A high temperature, the proportion of shorter wavelengths radiation, emitted by the body

Question # 2

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

Question # 3

Photoelectrons are emitted when ultraviolet light falls on:

Question # 4

The special theory of relativity is based on:

Question # 5

Compton derived an expression to find compton shift by applying to the process, the law of conservation of:

Question # 6

Davision and Germer performed experiment to verify

Question # 7

Position was discovered by Carl Anderson in

Question # 8

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

Question # 9

Photoelectric effect takes place with a photon of:

Question # 10

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

Question # 11

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

Question # 12

When a position comes close to an electron they annihilate into

Question # 13

Which of the following phenomenon proves the particle nature of light

Question # 14

The value of the Stephen's constant for black body radiations is given by

Question # 15

The nature of radiations emitted by a hot body depends upon its:

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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)
2 When a platinum wire is heated, it appears orange red at
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
3 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
4 The energy of the 4th orbit in hydrogen atom is
A. 2.5 ev
B. - 3.5 ev
C. -0.85 ev
D. -13.6 ev
5 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
6 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
7 Photoelectrons are emitted when ultraviolet light falls on:
A. Casium
B. Silver
C. Potassium
D. Any of these
8 Electromagnetic -radiation means:
A. Photons
B. protons
C. Electrons
D. Mesons
9 In photoelectric effect the energy of ejected electrons depend on
A. The frequency
B. The intensity
C. Both frequency and intensity
D. None of these
10 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
A. 1.66 m
B. 1.0 m
C. 0.66 m
D. 2.66 m

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