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ECAT Physics Online Test MCQs With Answers
Question # 1
On a cold morning a metal surface will fell colder to touch than a wooden surface, because
Choose an answer
Metal has high specific heat
Metal has high thermal conductivity
Metal has low specific heat
Metal has low thermal conductivity
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Question # 2
If the velocity time graph is a straight line parallel to the time-axis, then it means:
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The body is moving with uniform velocity
The body is moving with uniform acceleration
The body is at rest
None of these
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Question # 3
The disorder in the system increases due to the
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removal of heat
addition of heat
removal or addition of heat
none of them
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Question # 4
If the flow is incompressible and the flow is steady then the mass of the fluid through the pipe
Choose an answer
increases
decreases
becomes zero
is conserved
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Question # 5
In half wave rectification
Choose an answer
both halves of the input voltage is used
only one half of the input voltage is used
either of these
none of these
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Question # 6
The minimum charge on any object can not be less than
Choose an answer
1.6 x 10
-19
C
3.2 x 10
-19
C
1.0 C
4.8 x 10
-19
C
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Question # 7
The Boltzman constant has the value
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1.38 x 10
-23
JK
-1
1.28 x 10
-23
JK
-1
1.38 x 10
-26
JK
-1
1.28 x 10
-26
JK
-1
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Question # 8
Since the absolute scale is independent of the property of the working substance, hence, can be applied at
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very high temperature
very low temperature
any one of them
none of them
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Question # 9
When charged particle is projected perpendicular to a uniform magnetic field its trajectory is
Choose an answer
circular
elliptical
cycloid
straight line
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Question # 10
The SI unit of magnetic induction is
Choose an answer
Weber
Weber/meter
Henry
Tesla
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Question # 11
In bringing an electron towards another electron, electrostatic potential energy of system
Choose an answer
Decreases
Increases
Remains uncharged
Becomes zero
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Question # 12
The force which opposes the applied force producing the displacement in the spring is called
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restoring force
periodic force
centripetal force
resistive force
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Question # 13
The force experienced by an electron projected in a magnetic field B with a velocity V is given by
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F=e(V x B)
F= -e(V x B)
F= e(B x V)
Both a and c
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Question # 14
Electromagnetic waves transmit energy equal to
Choose an answer
1/2 mv
2
m
o
c
2
hf/c
hf
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Question # 15
The quantity F x t is called as
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momentum
velocity
acceleration
impulse
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Question # 16
An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:
Choose an answer
100 m/sec
140 m/sec
1960 m/sec
196 m/sec
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Question # 17
Transverse waves can be set up:
Choose an answer
Solids
Liquids
Gases
All of them
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Question # 18
The CRO deflects the beam of electrons, when they passes through uniform
Choose an answer
electric field
gravitational field
magnetic flax
magnetic field
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Question # 19
Curie is a unit of
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reluctance
resistivity
binding energy
radioactivity
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Question # 20
The basis to define a temperature scale that is independent of material properties is provided by
Choose an answer
carbon cycle
nitrogen cycle
Carnot cycle
irreversible cycle
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Question # 21
Lorentz force is defined as
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q(E + V x B)
q(E x B + V)
q(E x V + B)
q(E x B)
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Question # 22
Most practical applications of electricity involve
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Charges at rest
Charges in motion
Electrons at rest
Atoms in motion
Molecules in motion
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Question # 23
Distance traveled by a body falling from rest in the first, second and third second is in the ration of
Choose an answer
1 : 2 : 3
1 : 3 : 5
1 : 4 : 9
None of the above
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Question # 24
A body starting from rest covers a distance of 0.45 Km and acquires a velocity of 300 Kmh
-1
. its acceleration will be
Choose an answer
7.71 m s
-2
0.5m s
-2
0.15m s
-2
0.092m s
-2
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Question # 25
In a transistor, collector current is controlled by
Choose an answer
Collector voltage
Base current
Collector resistance
All of the above
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Question # 26
When a body is moving on a surface, the force of friction is called
Choose an answer
Static friction
Dynamic friction
Limiting friction
Rolling friction
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Question # 27
The year when A.H. compton was awarded Nobel Prize is:
Choose an answer
1923
1927
1931
1935
None of these
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Question # 28
For a fixed force, larger is the mass of a body the
Choose an answer
greater is its acceleration
smaller is its acceleration
smaller is its weight
zero is its acceleration
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Question # 29
The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be
Choose an answer
1 : 2
4 : 1
1 : 4
2 : 1
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Question # 30
The three equation of motions are useful only for
Choose an answer
linear motion with increasing acceleration
line motion with uniform acceleration
linear motion with zero acceleration
linear motion with varying acceleration
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Question # 31
The volume of given mass of a gas will be doubled at atmosphere pressure if the temperature of the gas is changed from 150
°C to
Choose an answer
300
°C
573
°C
600
°C
743
°C
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