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NAT II Physical Science Physics MCQs With Answers
Question # 1
A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?
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10 A
5 A
33.3 A
3.33 A
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Question # 2
In case of p-n junction diode, at high value of reverse bias, the current rises sharply. The value of reverse bias is known as:
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Cut off voltage
Zener voltage
Inverse voltage
Critical voltage
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Question # 3
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 # 4
The twinkling of stars is due to
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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 these
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Question # 5
In Which case does the potential energy decreases?
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On compressing a spring
On stretching a spring
One moving a body against gravitational force
One the rising of an air bubble in water
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Question # 6
A body moving in circular motion with constant speed has
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Constant velocity
Constant acceleration
Constant kinetic energy
Constant displacement
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Question # 7
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 # 8
The dimensional formula for the modulus of elasticity is same as that for:
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Stress
Strain
Velocity
Surface tension
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Question # 9
Ball pen function on the principle of
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Viscosity
Boyle's law
Gravitational force
Surface tension
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Question # 10
The sieman is the SI unit of
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Resistance
Specific Resistance
Conductance
Inductance
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Question # 11
When the length of a microscope tube increases, its magnifying power
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Decreases
Increases
May increases or decreases depending on the observer and the place of observation
Does not change
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Question # 12
An ideal choked (used along with fluorescent tube) would be
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A pure resistor
A pure capacitor
A pure inductor
A combination of an inductor and a capacitor
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Question # 13
Velocity of sound in a diatomic as is 300 m/sec, what is its rms velocity?
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400 m/sec
40 m/sec
430 m/sec
300 m/sec
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Question # 14
A ten-ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts:
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1310 W
670 W
810 W
1210 W
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Question # 15
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie
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Ultraviolet
Infrared
Visible
X-ray
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Question # 16
A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h. His average speed will be
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40 km/h
48 km/h
50 km/h
60 km/h
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