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Online Tests
Physics General Science Test Hard Mode MCQs With Answers
Question # 1
Which of the following sources give discrete emission spectrum?
Choose an answer
Incandescent electric bulb
Sun
Mercury vapour lamp
Candle
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Question # 2
Planck's constant has the dimensions of:
Choose an answer
Energy
Momentum
Frequency
Angular momentum
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Question # 3
Light appears to travel in straight lines since
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It is not absorbed by the atmosphere
It is reflected by the atmosphere
Its wavelength is very small
Its velocity is very large
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Question # 4
In a capacitive circuit
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Current leads voltage by phase of π/2
Voltage leads current by phase of π/2
Current and voltage are in same phase
Sometime current and sometime voltage leads
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Question # 5
The twinkling of stars is due to
Choose an answer
The fact that stars do not emit light continuously
The refractive index of the earth's atmosphere fluctuate
Intermittent absorption of star light by its own atmosphere
None of them
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Question # 6
A sun rise or sun set, the sun looks reddish because.
Choose an answer
The sun is coldest at these times
Of the effects of reflection and refraction
The sun is hottest at these times
Of the scattering of light
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Question # 7
Which of the modulus of elasticity is involved in compressing a rod to decrease its length?
Choose an answer
Young's modulus
Bulk modulus
Modulus of rigidity
None of the above
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Question # 8
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be
Choose an answer
0.1 watt
1 watt
10 watt
100 watt
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Question # 9
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie
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Ultraviolet
Infra red
Visible
X-ray
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Question # 10
The contrast in the fringes in any interference pattern depends on
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Fringe width
Intensity ratio of the sources
Distance between the slits
Wavelength
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Question # 11
Which of the following is the only vector quantity
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Temperature
Energy
Power
Momentum
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Question # 12
The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV?
Choose an answer
28
7
4
1
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Question # 13
The motion without consideration of its cause is studied in
Choose an answer
Kinematics
Mechanics
Statics
Modern Physics
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Question # 14
In a voltmeter the conduction takes place due to
Choose an answer
Electrons only
Holes only
Electrons and holes
Electrons and ions
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Question # 15
If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
Choose an answer
Increasing by a factor of 2
Decreasing by a factor of 2
Decreasing by a factor of 4
Unchanged
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Question # 16
Angular momentum is
Choose an answer
Vector (axial)
Vector (polar)
Scalar
None of these
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Question # 17
The temperature at which the speed of sound becomes double as was at 27
°
C is
Choose an answer
273
°
C
0
°
C
927
°
C
1027
°
C
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Question # 18
Which of the following sources give discrete emission spectrum?
Choose an answer
Incandescent electric bulb
Sun
Mercury vapour lamp
Candle
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Question # 19
Copper and germanium are cooled to 70K from room temperature, then
Choose an answer
Resistance of copper increases while that of germanium decreases
Resistance of copper decreases while that of germanium increases
Resistance of both decreases
Resistance of both increases
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Question # 20
Mechanical waves on the surfaces of a liquid are
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Transverse
Longitudinal
Torsional
both transverse and longitudinal
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Question # 21
Which of the following four statement is false?
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A body can have zero velocity and still be accelerated
A body can have a constant velocity and still have a varying speed
A body can have a constant speed and still have a varying velocity
The direction of the velocity of a body can change when its acceleration is constant
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Question # 22
The half-life of a radio-isotope is 5 years. The fraction of atoms decayed in this substance after 15 years will be
Choose an answer
1
3/4
7/8
5/8
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