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ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
the symbol to be used in relativity problems denotes:
Choose an answer
Dilated time
Proper time
Life time
Half time
None of these
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Question # 2
A particle of mass 5.0 mg moves with a speed of 8.0 m/s. Its de-Brogile wavelength is
Choose an answer
1.66 m
1.66 x 10
-10
m
1.66 x 10
-29
cm
1.66 x 10
-29
m
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Question # 3
0.1 kg mass will be equivalent to the energy
Choose an answer
9 x 10
15
J
5 x 10
8
J
6 x 10
16
J
9 x 10
-16
J
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Question # 4
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 # 5
Victor de-Brogile received the Nobel prize in physics in
Choose an answer
1925
1929
1932
1935
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Question # 6
Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
Choose an answer
ON switch
off switch
function switch
none of these
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Question # 7
According to the special theory of relativity, a moving clock
Choose an answer
runs faster
runs slower
neither runs faster nor slower
all of these
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Question # 8
de-Broglies hypthesis was experimentally verified by
Choose an answer
Maxwell
Compton
Einstein
Davison and Germer
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Question # 9
The Einstein's changes in length, mass and time are not observed in common life because
Choose an answer
We dont observer then seriously
The masses are too large
Their speed is too small than the speed of right
All of the above
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Question # 10
Compton derived an expression to find compton shift by applying to the process, the law of conservation of:
Choose an answer
Energy only
Momentum only
Mass only
Charge only
Both (A) and (B)
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Question # 11
The existence of position was predicted by Dirace in
Choose an answer
1920
1925
1930
1928
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Question # 12
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 # 13
When a platinum wire is heated, it appears yellow at
Choose an answer
1600°C
900°C
1100°C
1300°C
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Question # 14
An inertial frame is that frame in which
Choose an answer
a>0
a=0
a<0
none of these
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Question # 15
Position was discovered by Carl Anderson in
Choose an answer
1920
1925
1928
1932
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Question # 16
In order to produce pair production, a photon must have a energy
Choose an answer
0.511 Me v
0.256 Me v
1.02 Me v
0.956 Me v
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