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 concept of direction is purely:

Question # 2

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 # 3

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

Question # 4

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

Question # 5

the dilation of time applies to the timing processes which are:

Question # 6

Electromagnetic radiation or photons interact with matter in

Question # 7

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

Question # 8

Compton was awarded Nobel prize in physics in

Question # 9

At the temperature, a body emits radiation which is principally

Question # 10

When a position comes close to an electron they annihilate into

Question # 11

The positron was discovered by:

Question # 12

Position was discovered by Carl Anderson in

Question # 13

According to the Max plank, energy is redialed or absorbed in

Question # 14

The Einstein's changes in length, mass and time are not observed in common life because

Question # 15

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

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Wave nature of particle was proposed by
A. Einstein
B. Plank
C. De-Brogile
D. Max well
2 In order to produce pair production, a photon must have a energy
A. 0.511 Me v
B. 0.256 Me v
C. 1.02 Me v
D. 0.956 Me v
3 G.P. Thomson observer experimentally that electrons and neutrons possess
A. particle-like properties
B. wave-like properties
C. neither particle nor wave like properties
D. none of these
4 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
5 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
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 The concept of direction is purely:
A. Absolute
B. Relative
C. Relative to stars always
D. Relative to the sun always
8 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
9 The photoelectric effect, the maximum energy of photoelectrons depends on the
A. particular metal surface
B. frequency of incident light
C. both of them
D. none of them
10 The mass of an object will be doubled at speed
A. 1.6 x 108ms-1
B. 2.6 X 108ms-1
C. 2.6 x 107ms-1
D. 2.6 x 109ms-1

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