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 A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

Question # 2

Converse of pair production is known as

Question # 3

According to the special theory of relativity, a moving clock

Question # 4

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

Question # 5

Practically the quantity v/c is always:

Question # 6

Electromagnetic radiation or photons interact with matter in

Question # 7

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

Question # 8

When a platinum wire is heated, it appears yellow at

Question # 9

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

Question # 10

Due to relative motion of observer and the frame of reference of events, time always:

Question # 11

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

Question # 12

A black body is

Question # 13

Electromagnetic -radiation means:

Question # 14

The special theory of relativity is based on:

Question # 15

In the compton's effect, it is found that the wavelength of incident x-rays is

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ECAT Physics Chapter 19 Important MCQ's

Sr.# Question Answer
1 Max Planck received the Nobel Prize for his discovery of energy quants in:
A. 1718 AD
B. 1918 AH
C. 1818 AD
D. 1918 AD
2 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
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 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
5 Electromagnetic radiation or photons interact with matter in
A. two distinct ways
B. three distinct ways
C. four distinct ways
D. five distinct ways
6 The photon of radio-waves has energy of about
A. 1 Me V
B. 1 Ke v
C. 10-10e v
D. 1010e v
7 Intensity of light determines the:
A. Energy of each photon
B. Number of photons
C. Speed of photons
D. Size of photons
8 If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers
A. larger
B. shorter
C. equal
D. none of these
9 The existence of position was predicted by Dirace in
A. 1920
B. 1925
C. 1930
D. 1928
10 Victor de-Brogile received the Nobel prize in physics in
A. 1925
B. 1929
C. 1932
D. 1935

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