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ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
According to the special theory of relativity, time is
Choose an answer
absolute quantity
not absolute quantity
constant quantity
none of these
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Question # 2
The photon of radio-waves has energy of about
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1 Me V
1 Ke v
10
-10
e v
10
10
e v
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Question # 3
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
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1890
1895
1900
1905
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Question # 4
de-Broglies hypthesis was experimentally verified by
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Maxwell
Compton
Einstein
Davison and Germer
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Question # 5
At the temperature, a body emits radiation which is principally
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of long wavelengths in the visible region
of long wavelengths in the invisible infrared region
of short wavelength in invisible ultraviolet region
none of these
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Question # 6
Due to relative motion of observer and the frame of reference of events, time always:
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Dilates itself
Contracts itself
Stretches itself
Both (A) and (C)
None of these
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Question # 7
Compton studied the scattering of x-rays by loosely bound electrons from:
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NaCl crystal
Graphite crystal
Zirconia
Copper crystal
None of these
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Question # 8
A black body is
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an ideal absorber
an ideal radiator
both of them
none of them
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Question # 9
The Nobel Prize on the explanation of photoelectric effect was awarded to:
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Max. Planck
Maxwell
Bohr
Rutherford
None of these
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Question # 10
The value of the plank's constant 'h' is given by
Choose an answer
1.6 x 10
-19
J
1.67 x 10
-27
Kg
6.63 x 10
34
Js
6.63 x 10
-34
Js
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Question # 11
The inside cavity of the black body is
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painted white
painted silver
blackened with soot
painted red
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Question # 12
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
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decreases
first increases then decreases
increases
any one of them
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Question # 13
The concept of direction and position are purely
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absolute
relative
absolute or relative
none of these
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Question # 14
According to the Max plank, energy is redialed or absorbed in
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discrete packets
continuous waves
either of them
none of these
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Question # 15
Strictly speaking, the earth is:
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An accelerated frame of reference
A non-inertial frame of reference
An inertial frame of reference
A non-accelerated frame of reference
Both (A) and (B)
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Question # 16
Electromagnetic radiation or photons interact with matter in
Choose an answer
two distinct ways
three distinct ways
four distinct ways
five distinct ways
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