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Physics General Science Test Hard Mode MCQs With Answers
Question # 1
Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)
Choose an answer
3.2 x 10-21 J
3.2 x 10-19 J
7 x 10-25 J
9 x 10-32 J
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Question # 2
The peak voltage in a 200 volt A.C supply is nearly
Choose an answer
220
253
311
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Question # 3
Steel is preferred for making springs over copper.Whey?
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Steel is cheaper
Young's modulus of steel is more than that of copper
Young's modulus of copper is more than that of steel
Steel is less likely to be oxidized
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Question # 4
A bullet is short from a rifle. As a result the rifle recoils, The kinetic energy of rifle as compared to that of bullet is
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Less
Greater
Equal
Cannot be concluded
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Question # 5
What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?
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12
6
3
2
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Question # 6
The part of a transistor which is heavily doped to produce large number of majority carriers is
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Emitter
Base
Collector
Any of the above depending on nature of transistor.
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Question # 7
What remains constant when the earth revolves around the sun?
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Angular momentum
Linear momentum
Angular kinetic energy
Linear kinetic energy
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Question # 8
The magnetic moment of a circular coil carrying current is
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Directly proportional to the length of the wire in the coil
Inversely proportional to the length of the wire in the coil
Directly proportional to the square of the length of the wire in the coil
Inversely proportional to the square of the length of the wire in the coil
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Question # 9
Mechanical waves on the surface of a liquid are
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Transverse
Longitudinal
Torsional
Both transverse and longitudinal
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Question # 10
When boron is added as an impurity to silicon the resulting material is
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n type conductor
n type semiconductor
p-type conductor
p-type semiconductor
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Question # 11
The average power dissipation in a pure capacitor in AC circuit is
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1/2 CV
2
CV
2
2CV
2
Zero
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Question # 12
The smooth or steady stream-line flow is know as
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Laminar flow
Turbulent flow
Both a and b
None of the above
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Question # 13
The half-life of a radio-isotope is 5 years. The fraction of atoms decayed in this substance after 15 years will be
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1
3/4
7/8
5/8
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Question # 14
For obtaining appreciable extension, the wire should be
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Short and thin
Long and thin
Short and thick
Long and thick
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Question # 15
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are
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Energy, momentum and mass
Energy
Energy and mass
Energy and linear momentum
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Question # 16
In a common base transistor circuit, the current gain is 0.98. On changing the emitter current by 5.00 mA, the change in collector current is
Choose an answer
0.916 mA
2.45 mA
4.9 mA
5.1 mA
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Question # 17
The angle between rectangular components of a vector is
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0
°
60
°
90
°
120
°
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Question # 18
To make the frequency double of an oscillator, we have to
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Double the mass
Half the mass
Quadruple the mass
Reduce the mass to one fourth
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Question # 19
When boron is added as an impurity to silicon, the resulting material is.
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n type conductor
n type semiconductor
p-type conductor
p-type semiconductor
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Question # 20
Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is
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0
°
60
°
120
°
180
°
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Question # 21
When we apply reverse bias to a junction diode, it
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Lowers the potential barrier
Raise the potential barrier
Increase the majority carrier current
Increase the minority carrier current
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Question # 22
Absolute temperature can be calculated by
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Mean square velocity
Motion of the molecule
Both A and B
None of these
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