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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
Which of the following is scalar quantity?
Choose an answer
Electric potential
Velocity
Momentum
Force
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Question # 2
1 amu is equal to.
Choose an answer
1.66 x 10
-24
kg
1.66 x 10
-19
kg
1.66 x 10
-24
kg
1.66 x 10
-27
kg
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Question # 3
The smooth or steady streamline flow is known as
Choose an answer
laminar flow
turbulent flow
both of them
none of them
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Question # 4
The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec
-2
comes out to be
Choose an answer
980 N
580 N
1380 N
Zero
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Question # 5
The size of the domain is such that they can contain
Choose an answer
10
2
to 10
4
atoms
10
4
to 10
8
atoms
10
8
to 10
12
atoms
10
12
to 10
16
atoms
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Question # 6
Absolute zero is considered as that temperature at which:
Choose an answer
All liquid become gases
All gases become liquid
Water freezes
None of these
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Question # 7
Which of the following can become a good temporarily magnet
Choose an answer
iron
steel
both of them
none of them
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Question # 8
The resistance of the given conductor can be increased by
Choose an answer
Increasing the area
Changing resistivity
Decreasing the length
None of the above because change does not matter because in any case the volume remains the same
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Question # 9
Wave nature of particle was proposed by
Choose an answer
Einstein
Plank
De-Brogile
Max well
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Question # 10
In the study of thermodynamics, which gas is considered as the working substance
Choose an answer
real gas
ideal gas
any gas may be ideal or real
none of them
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Question # 11
If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s
2
)
Choose an answer
9.8 m/s
19.6 m/s
39.2 m/s
98.0 m/s
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Question # 12
Compton shift refers to:
Choose an answer
Photon
Meson
Proton
Positron
Both (B) and (D)
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Question # 13
Work done on a body by gravity in lifting it up to certain height is
Choose an answer
Maximum
Minimum
Zero
Negative
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Question # 14
In a semi-conductor material, current flows due to
Choose an answer
positive charge
negative charge
both of them
none of them
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Question # 15
Silicon can be obtained from
Choose an answer
Lead
Uranium
An isotope of oxygen
Sand
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Question # 16
The gavanometer constant of a moving coil galvanometer is given by
Choose an answer
K=BAN/C
K=BN/CA
K=NAC/B
K=C/BAN
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Question # 17
The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:
Choose an answer
Greater than
Less than
Equal to
None of these
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Question # 18
In a transistor, if the central region is p-type then this type of transistor is known as
Choose an answer
p-n-p transistor
n-p-n transistor
either of these
none of these
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Question # 19
If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
Choose an answer
2 : 1
4 : 1
1 : 4
3 : 4
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Question # 20
In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:
Choose an answer
Greater than
Equal to
Smaller than
None of these
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Question # 21
The wave form of S.H.M will be
Choose an answer
square wave
sine wave
rectified wave
saw-tooth wave
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Question # 22
The RMS value of alternating current is:
Choose an answer
0.7 times at the peak value
0.5 times the peak value
0.7 times the Instantaneous value
Equal to maximum voltage
None of these
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Question # 23
Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is
Choose an answer
Less than atmospheric pressure
Much less than atmospheric pressure
Greater than atmospheric pressure
Much greater than atmospheric pressure
Both C and D
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Question # 24
The mass of fluid passing through any cross-section per unit time is called
Choose an answer
electric flux
magnetic flux
mass flux
none of them
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Question # 25
An alpha particle is accelerated through a potential difference of 10
6
volt. Its kinetic energy will be
Choose an answer
1 MeV
2 MeV
4 MeV
8 MeV
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Question # 26
At constant temperature, if the density of the gas is increased, its pressure will:
Choose an answer
One kg of a substance
Unit volume of a substance
One mole of a substance
None of these
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Question # 27
The distance covered by a body in unit time is called.
Choose an answer
Displacement
speed
Velocity
Both B and C
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Question # 28
The magnetic field inside a solenoid can be increased by:
Choose an answer
Increasing n
Decreasing I
Increasing I
By using iron core within solenoid
All correct except (B)
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Question # 29
A body with frequency of would complete one vibration in:
Choose an answer
f seconds
1/f seconds
1 second
f
2
second
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Question # 30
Two forces of 10N and 8N are applied simultaneously to a body. The maximum value of their resultant is:
Choose an answer
20 N
-2 N
18 N
36 N
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Question # 31
Which force is not a conservative force?
Choose an answer
Frictional force
Gravitational force
Electric force
Elastic spring force
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