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NAT II Physical Science Physics MCQs With Answers
Question # 1
A prism splits a beam of white light into its seven constituent colors. This is so because
Choose an answer
Phase of different colors is different
Amplitude of different colors is different
Energy of different colors is different
Velocity of different colors is different
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Question # 2
In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10
-19
C. The number of excess electrons on the drop is
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3.9
4
4.2
6
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Question # 3
Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (Work function = 4.2 eV)
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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 # 4
Planck's constant has the dimensions of:
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Energy
Momentum
Frequency
Angular momentum
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Question # 5
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 # 6
Who explained the origin of the Fraunhoffer lines?
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Fraunhoffer
Kirchhoff
Fresnel
Snell
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Question # 7
Electrons in the atom are held in the atom due to
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Coulomb forces
Nuclear forces
Gravitational forces
Van der Waal's forces
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Question # 8
Two electric bulbs of 200 W and 100 W have same voltage. If R
1
and R
2
be their resistance respectively then
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R
1
=2R
2
R
2
=2R
1
R
2
=4R
1
R
1
=4R
2
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Question # 9
In which case application of angular velocity is useful?
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When a body is rotating
When velocity of body is in a straight line
When velocity is in a straight line
None of these
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Question # 10
Angular momentum is
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Vector (axial)
Vector (polar)
Scalar
None of these
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Question # 11
Quantity that remains unchanged in a transformer is
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Voltage
Current
Frequency
None of these
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Question # 12
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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Question # 13
According to Stoke's law, drag force depends on
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Initial velocity
Final velocity
Terminal velocity
Instantaneous velocity
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Question # 14
The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an a.c. supply of 20 V, 50 Hz. The secondary will have an output of
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200V, 50 Hz
2V, 50 Hz
200V, 500 Hz
2V, 5 Hz
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Question # 15
Steel is preferred for making springs over copper. Why?
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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 ot be oxidized
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Question # 16
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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