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ECAT Physics Chapter 19 Dawn of Modern Physics Online Test MCQs With Answers
Question # 1
The unit of work function is:
Choose an answer
Joule
Electron volt
That of threshold frequency
Both (A) and (B)
None of these
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Question # 2
The mass of an object will be doubled at speed
Choose an answer
1.6 x 10
8
ms
-1
2.6 X 10
8
ms
-1
2.6 x 10
7
ms
-1
2.6 x 10
9
ms
-1
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Question # 3
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 # 4
S.I. unit of planks constant is
Choose an answer
J-s
-1
J.s
J.s
-2
J.s
2
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Question # 5
When low energy photon interact with a metal,which of the following effect is likely to be taken place
Choose an answer
pair production
photoelectric
Compton effect
None of these
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Question # 6
Practically the quantity v/c is always:
Choose an answer
less than one
Equal to one
Greater then one
all of these
None of these
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Question # 7
the dilation of time applies to the timing processes which are:
Choose an answer
Physical
Chemical
Biological
All of these
None of these
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Question # 8
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 # 9
A photon is considered to have
Choose an answer
Momentum
Energy
Wavelength
All of the above
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Question # 10
Photoelectrons are emitted when ultraviolet light falls on:
Choose an answer
Casium
Silver
Potassium
Any of these
None of these
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Question # 11
As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:
Choose an answer
Smaller
Lerger
Same
Much larger
None of these
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Question # 12
The threshold frequency of sodium is 6 x 10
6
MHz. The cut-off wavelength for this metal will be
Choose an answer
500 m
500 nm
500 km
500 cm
None of these
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Question # 13
Pair production is the phenomenon in which
Choose an answer
matter is converted into energy
energy is converted into matter
light is converted into electrical energy
electrical energy is converted into light
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Question # 14
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 # 15
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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