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Online Tests
Physics General Science Test Hard Mode MCQs With Answers
Question # 1
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 # 2
Ball pen function on the principle of
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Viscosity
Boyle's law
Gravitational force
Surface tension
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Question # 3
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 # 4
Center of mass is a point
Choose an answer
Which is geometric center of a body
From which distance of particles are same
Where the whole mass of the body is supposed to be centered
Which is the origin of reference frame
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Question # 5
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
0.73 I
o
I
o
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Question # 6
A particle moving in a magnetic field has increase in its velocity then its radius of the circle
Choose an answer
Decreases
Increases
Remains the same
Becomes half
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Question # 7
The structure of solids is investigated by using
Choose an answer
Cosmic Rays
X-rays
Intra red Radiation
y-rays
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Question # 8
When we apply reverse bias to a junction diode it
Choose an answer
Lowers the potential barrier
Raises the potential barrier
Increase the majority carrier current
Decrease the majority carrier current
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Question # 9
Absolute temperature can be calculated by
Choose an answer
Mean square velocity
Motion of the molecule
Both (A) and (B)
None of these
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Question # 10
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie
Choose an answer
Ultraviolet
Infra red
Visible
X-ray
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Question # 11
Angular momentum is
Choose an answer
Vector (axial)
Vector (polar)
Scalar
None of these
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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
A conducting wire is drawn to double its length. Final resistivity of the material will be
Choose an answer
Double of the original one
Half of the original one
One-fourth of the original one
Same as original one
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Question # 14
Quantity that remains unchanged in a transformer is
Choose an answer
Voltage
Current
Frequency
None of these
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Question # 15
The fundamental unit which has same power in the dimensional formula of surface tension and viscosity is:
Choose an answer
Mass
Length
Time
None
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Question # 16
Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is
Choose an answer
Zero
5N
25N
150N
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Question # 17
To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined
Choose an answer
Parallel
Antiparallel
At angle 60
°
Perpendicular to each other
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Question # 18
The dimensional formula of torque is:
Choose an answer
[ML
2
T
-2
]
{MLT
-2
]
[ML
-1
T
-2
]
[ML
-2
T
-2
]
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Question # 19
For obtaining appreciable extension, the wire should be
Choose an answer
Short and thin
Long and thin
Short and thick
Long and thick
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Question # 20
In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45
°
, the value of inductive reactance will be
Choose an answer
R/4
R/2
R
Cannot be found with the given data
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Question # 21
Which quantity is increased in step-down transformer?
Choose an answer
Current
Voltage
Power
Frequency
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Question # 22
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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