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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of:
Choose an answer
Newton's second law
Pascal's law
Carnot theorem
Second law of thermodynamics
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Question # 2
A ray passing through optical center of a lens, after refraction:
Choose an answer
Passes through focus
Go deviated
Retraces its path
Both B and C
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Question # 3
The velocity gained by the fluid in falling through the distance (h
1 - h
2) under the action of gravity is equal to the speed of the action of gravity is equal to the speed of the
Choose an answer
orifices
efflux
fluid
none of them
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Question # 4
The wave motion set up in any medium depends upon:
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Elasticity
Inertia
Density
All of these
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Question # 5
The crystalline structure of NaCI is
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rectangular
hexagonal
tetrahedral
cubical
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Question # 6
The lasing or active medium in He-Ne laser discharge tube is:
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Nitrogen
Helium
Hydrogen
Neon
None of these
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Question # 7
A typical rocket consumes about
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100 kg s
-1
of fuel
1000 kg s
-1
of fuel
10000 kg s
-1
of fuel
100000 kg s
-1
of fuel
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Question # 8
The value of relative permittivity of different dielectrics are:
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Equal
Different
Greater than one
Smaller than one
Both (B) and (C)
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Question # 9
Resistance of a conductor depends upon
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the quantity of current passing through it
the voltage applied between its end
its dimensions, physical state and nature of its material
all of the above
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Question # 10
When charged particle is projected perpendicular to a uniform magnetic field its trajectory is
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circular
elliptical
cycloid
straight line
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Question # 11
The frequency of free vibrations is known as
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free frequency
forced frequency
natural frequency
un-natural frequency
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Question # 12
The phase determines the
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displacement
amplitude
frequency
state of motion of vibrating body
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Question # 13
In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
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Greater than
Equal to
Smaller than
None of these
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Question # 14
In metallic crystals which of the following thing remains constant
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amplitude of oscillations
temperature of solid
average atomic positions
all of them
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Question # 15
Referring to above figure, a changing current in coil P can be produced:
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At the instant the switch is closed
At the instant the switch is opened
With the help of rheostat
All of these
None of these
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Question # 16
Angular momentum
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Scalar
Axial vector
Polar vector
At 45
° angle
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Question # 17
The temperature at which the speed of sound becomes double as was at 27
°C is
Choose an answer
273
°C
0
°C
927
°C
1027
°C
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Question # 18
In a normally biased n-p-n transistor, an electron c current I
E
flows from the
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emitter into the base
collector into the base
base into collector
none of these
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Question # 19
Which of the following can become a good temporarily magnet
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iron
steel
both of them
none of them
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Question # 20
Monochromatic light means waves of:
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Same frequency
Same colour
Same wavelength
All of them
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Question # 21
The number of countries who manage the largest satellite system is:
Choose an answer
3
24
126
200
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Question # 22
Efficiency of carnot engine is independent of the
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temperature of sink
temperature of source
nature of the working substances
none of them
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Question # 23
When we consider the average velocity of a body, then the body is moving in
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straight line
curved path
may be in a straight or curved path
none of them
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Question # 24
A choke coil is used as a resistance in
Choose an answer
d.c. circuit
a.c. circuit
d.c. potentiometer circuit
wheatstone bridge
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Question # 25
The amount of energy equivalent to 1 a.m.u is
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9.315 Mev
93.15 Mev
931.5 Mev
2.22 Mev
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Question # 26
When a shall explodes a mid-air, the total momentum of its fragments is
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less than the momentum of shell
equal to the momentum of shell
greater than the momentum of shell
none of them
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Question # 27
An object is dropped from a height of 100 m. Its velocity at the moment it touches the ground is:
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100 m/sec
140 m/sec
1960 m/sec
196 m/sec
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Question # 28
In case of planets, the necessary acceleration is provided by:
Choose an answer
Gravitational force
Coulomb force
Frictional force
None of these
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Question # 29
Amplitude is the displacement of the vibrating body from:
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One extreme position to the other extreme position
Mean position any one extreme position
Both A and B are correct
None of these
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Question # 30
The equation of continuity
A
1
V
1
= A
2
V
2
is for the flow of
Choose an answer
an ideal fluid
an incompressible fluid
a non visconcous fluid
all of the above
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Question # 31
The pressure will change in the pipe, as the fluid moves through that pipe of varying
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cross-section
height
none of them
both of them
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