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

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

Question # 2

Photoelectric effect takes place with a photon of:

Question # 3

The energy of photon 'E' is proported to

Question # 4

The unit of work function is:

Question # 5

When a position comes close to an electron they annihilate into

Question # 6

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

Question # 7

A photon is considered to have

Question # 8

Max Planck received the Nobel Prize for his discovery of energy quants in:

Question # 9

The inside cavity of the black body is

Question # 10

According to the special theory of relativity, a moving clock

Question # 11

Davision and Germer performed experiment to verify

Question # 12

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

Question # 13

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

Question # 14

Strictly speaking, the earth is:

Question # 15

According to the de-Brogile relation, an object of large mass and ordinary speed has

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 When low energy photon interact with a metal,which of the following effect is likely to be taken place
A. pair production
B. photoelectric
C. Compton effect
D. None of these
2 The year when A.H. compton was awarded Nobel Prize is:
A. 1923
B. 1927
C. 1931
D. 1935
3 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
4 If a body reaches a speed equal to the speed of light, then its mass will became
A. zero
B. very small
C. infinity
D. none of these
5 When the atomic particle are moving with velocities approaching that of light:
A. Newton's laws become valid
B. Relativistic effects become prominent
C. Botha(A) and (B) are valid
D. Neither (A)nor (B)
6 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
7 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
8 When a platinum wire is heated, it appears dull red at about
A. 500°C
B. 900°C
C. 1100°C
D. 1300°C
9 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
10 A particle having mass and charge equal to that of an electron is called:
A. Proton
B. Positron
C. Pion
D. Pi-meson

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