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

When a platinum wire is heated, it appears yellow at

Question # 2

Wave nature of particle was proposed by

Question # 3

The value of the plank's constant 'h' is given by

Question # 4

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 # 5

In process of annihilation of matter, the two photons produced move in opposite direction to converse

Question # 6

With the help of 50 K v electron microscope, a resolution of

Question # 7

The photon of radio-waves has energy of about

Question # 8

According to the special theory of relativity

Question # 9

The special theory of relativity is based on the

Question # 10

Practically the quantity v/c is always:

Question # 11

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

Question # 12

Compton studied the scattering of x-rays by loosely bound electrons from:

Question # 13

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Position was discovered by Carl Anderson in
A. 1920
B. 1925
C. 1928
D. 1932
2 Photocell is a device which converts
A. chemical energy into electrical energy
B. electrical energy into light energy
C. heat energy into electrical energy
D. light energy into electrical energy
3 The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is
A. 100 J
B. 1.6 x 10-17J
C. 100 eV
D. 1.6 x 10-17eV
4 Compton studied the scattering of x-rays by loosely bound electrons from:
A. NaCl crystal
B. Graphite crystal
C. Zirconia
D. Copper crystal
5 Compton shift refers to:
A. Photon
B. Meson
C. Proton
D. Positron
6 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
7 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)
8 According to the special theory of relativity
A. mass and energy are same entities
B. mass and energy are same entities but interconverible
C. mass and energy are different entities but interconverible
D. mass and energy are different entities but non-interconveritble
9 The energy of photon 'E' is proported to
A. The magnetic field H
B. The electric field E
C. Both the electric and magnetic field H and E
D. Frequency
10 The Stephen-Boltzmann law for the black body radiation is given by
A. E = T2
B. E = -T2
C. E = T4
D. E = -T4

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