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

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

Question # 2

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 # 3

The unit of work function is:

Question # 4

Wien's constant is measured in:

Question # 5

Pair production is the phenomenon in which

Question # 6

When a platinum wire is heated, it appears yellow at

Question # 7

The special theory of relativity is based on:

Question # 8

The concept of direction is purely:

Question # 9

The idea of quantization of energy was proposed by:

Question # 10

de-Broglies hypthesis was experimentally verified by

Question # 11

Which of the following is not an example of intertial frame

Question # 12

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

Question # 13

In photoelectric effect the energy of ejected electrons depend on

Question # 14

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

Question # 15

Photocell is a device which converts

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 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
2 When platinum wire is heated, it appears cherry red at
A. 1600°C
B. 900°C
C. 1100°C
D. 1300°C
3 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
4 The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:
A. Wien's constant
B. Stefen's constnat
C. Planck's constant
D. Boltzmann's constant
5 Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
A. ON switch
B. off switch
C. function switch
D. none of these
6 The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes
A. 2 mo
B. 1.67 mo
C. 0.67 mo
D. 2.67 mo
7 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
8 de-Broglies hypthesis was experimentally verified by
A. Maxwell
B. Compton
C. Einstein
D. Davison and Germer
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 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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