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Physics General Science Test Hard Mode MCQs With Answers
Question # 1
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
Choose an answer
Cut off voltage
Zener voltage
Inverse voltage
Critical voltage
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Question # 2
Steel is preferred for making springs over copper.Whey?
Choose an answer
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 # 3
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
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0.1 watt
1 watt
10 watt
100 watt
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Question # 4
The structure of solids is investigated by using
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Cosmic Rays
X-rays
Intra red Radiation
y-rays
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Question # 5
The average binding energy of a nucleon inside an atomic nucleus is about
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8 MeV
8 eV
8 Joules
8 ergs
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Question # 6
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 # 7
A sun rise or sun set, the sun looks reddish because.
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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 # 8
Choose the correct statement
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Both an ammeter and voltmeter should have small resistance
Both an ammeter and a voltmeter should have large resistance
An ammeter should have large resistance and a voltmeter should have small resistance
An ammeter should have small resistance and a voltmeter should have large resistance
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Question # 9
If the earth were to rotate faster than its present speed the weight of an object will
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Increase at the equator but remain unchanged at the poles
Decrease at the equator but remain unchanged at the poles
Remain unchanged at the decrease but decrease at the poles
Remain unchanged at the equator but increase at the poles
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Question # 10
What is the ratio of r.m.s velocity for O
2
to H
2
?
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1/4
4
√4 : 1
1 : √4
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Question # 11
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 # 12
Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is
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Zero
5N
25N
150N
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Question # 13
A voltmeter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance in series will be
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2000 ohm
4000 ohm
6000 ohm
8000 ohm
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Question # 14
The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:
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Mass
Length
Time
None
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Question # 15
The time period of a simple pendulum is 2 seconds. If its length is increased by 4 times, then its period becomes
Choose an answer
16 s
12 s
8 s
4 s
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Question # 16
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 # 17
Ultra-violet radiation of 6.2 eV falls on an aluminium surface. K.E. of fastest electron 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 # 18
Planck's constant has the dimensions of:
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Energy
Momentum
Frequency
Angular momentum
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Question # 19
Which one of the following is a simple harmonic motion?
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Wave moving through a string fixed at both ends
Earth spinning about its own axis
Ball bouncing between two rigid vertical walls
Particle moving in a circle with uniform speed
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Question # 20
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 # 21
In an L-R circuit, time constant is that time in which current grows from zero to the value
Choose an answer
0.63 I
o
0.50 I
o
0.37 I
o
I
o
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Question # 22
A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum
Choose an answer
Becomes zero
Increases
Decreases
Remains the same
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