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Online Tests
ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
A high temperature, the proportion of shorter wavelengths radiation, emitted by the body
Choose an answer
decreases
first increases then decreases
increases
any one of them
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Question # 2
Max Planck received the Nobel Prize for his discovery of energy quants in:
Choose an answer
1718 AD
1918 AH
1818 AD
1918 AD
None of these
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Question # 3
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 # 4
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 # 5
The general theory of relativity treats problems involving
Choose an answer
inertial frame of references
accelerating frame of references
both of these
none of these
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Question # 6
The energy of photon 'E' is proported to
Choose an answer
The magnetic field H
The electric field E
Both the electric and magnetic field H and E
Frequency
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Question # 7
The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
Choose an answer
Lummer
Planck
Pringsheim
Both (A ) and (B)
Both (A) and (C)
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Question # 8
The Nobel Prize on the explanation of photoelectric effect was awarded to:
Choose an answer
Max. Planck
Maxwell
Bohr
Rutherford
None of these
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Question # 9
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
Choose an answer
pair production
Compton effect
photoelectric effect
relativity
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Question # 10
Newton's law of motion do not hold in
Choose an answer
an accelerated frame of reference
an unaccelerated frame of reference
both of these
none of these
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Question # 11
Photocell is a device which converts
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chemical energy into electrical energy
electrical energy into light energy
heat energy into electrical energy
light energy into electrical energy
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Question # 12
When platinum wire is heated, then at the temperature of 500
o
C, it becomes:
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Yellow
Orange red
Dull red
White
Cherry red
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Question # 13
The special theory of relatively treats the problems involving:
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Inertial frames of reference
Non-inertial frames
Non-accelerated frame
Botha (A) and (C)
Both (B) and (C)
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Question # 14
Due to relative motion of observer and the frame of reference of events, time always:
Choose an answer
Dilates itself
Contracts itself
Stretches itself
Both (A) and (C)
None of these
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Question # 15
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 # 16
The idea of quantization of energy was proposed by:
Choose an answer
Einstein
Max.Planck
Maxwell
Bohr
Rutherford
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