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ECAT Physics Online Test MCQs With Answers
Question # 1
A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?
Choose an answer
0.1 m/s
10 m/s
1 m/s
0.01 m/s
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Question # 2
In the compton's effect, it is found that the wavelength of incident x-rays is
Choose an answer
greater than the wavelength of scattered x-rays
equal to the wavelength of scattered x-rays
less than the wavelength of scattered x-rays
any one of these
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Question # 3
The closed loop gain of the non-inverting amplifier is given by
Choose an answer
G = R
2
/R
1
G = -R
2
/R
1
G = 1 - R
2
/R
1
G = 1 + T
2
/R
1
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Question # 4
The value of the Stephen's constant for black body radiations is given by
Choose an answer
5.6 x 10
8
Wm
-2
K
-4
5.67 x 10
-8
Wm
-2
K
-4
2.9 x 10
-3
mK
2.9 x 10
3
mK
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Question # 5
There is no net transfer of energy by particle of medium in
Choose an answer
Longitudinal wave
Transverse wave
Progressive wave
Stationary wave
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Question # 6
The drag force acting on a spherical droplet of radius 10
-5
m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10
-7
m/sec. The units comes out to be:
Choose an answer
10
-16
N
10
-14
N
10
-12
N
10
-10
N
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Question # 7
The units of modulus of elasticity are
Choose an answer
Nm
-2
Nm
ms
-1
Pascal
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Question # 8
SI unit of frequency is
Choose an answer
second
hertz
revolution
vibrations/sec
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Question # 9
Electromagnetic waves emitted by hot bodies are called:
Choose an answer
Photoelectrons
Alpha rays
Thermal radiation
None of these
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Question # 10
Bernoulli's equation is important in the field of
Choose an answer
Electrical circuit
Magnetism
Photoelectric effect
Flow of fluids
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Question # 11
When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as
Choose an answer
acceptor
donor
either of them
none of them
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Question # 12
The pressure will change in the pipe, as the fluid moves through that pipe of varying
Choose an answer
cross-section
height
none of them
both of them
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Question # 13
In an A.C circuit with resistor only, the current and voltage have a phase angle of
Choose an answer
90
°
0
°
180
°
none of these
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Question # 14
Change in momentum is one second called.
Choose an answer
Impulse
Force
Energy
Work
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Question # 15
Fidelity refers to
Choose an answer
Reproduction of original sound
Reproduction of original image
Reproduction of music
Reproduction of a CD from original copy
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Question # 16
An object undergoes S.H.M has maximum acceleration when its displacement form the means position
Choose an answer
maximum
zero
half of the maximum value
one third of the maximum value
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Question # 17
A change in position of a body from its initial position to its final position is known as
Choose an answer
relative motion
displacement
distance
acceleration
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Question # 18
Shock absorber of the car is an example of
Choose an answer
resonance
forced oscillations
interference
damped oscillations
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Question # 19
If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be
Choose an answer
0.1 watt
1 watt
10 watt
100 watt
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Question # 20
Where the streamlines are very far apart from each other, the pressure will be
Choose an answer
low
zero
high
all of them
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Question # 21
Glass and high carbon steel are the examples of
Choose an answer
brittle substances
ductile substances
plastic substances
elastic substances
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Question # 22
The first super conductor was discovered in
Choose an answer
1811
1890
1901
1911
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Question # 23
10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
Choose an answer
Each have same number of molecules
Don't have same number of molecules
Can't be predicted
None
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Question # 24
A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after
Choose an answer
10 s
20 s
5 s
40 s
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Question # 25
when the deformation produced in the material become permanent, this type of behaviour is called
Choose an answer
proportionality
elasticity
plasticity
none of them
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Question # 26
The fourth band is a:
Choose an answer
Silver band
Red band
Gold band
Either A or C
Either A or B
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Question # 27
The SI unit of permitivity is
Choose an answer
Nm
2
C
2
N
-1
m
-2
C
2
NmC
2
Nm
2
C
-1
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Question # 28
Examples of moderators used in a fission reactor is/are:
Choose an answer
Water
Heavy water
Carbon
Hydrocarbon
All of these
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Question # 29
The value of resistivity is the least for:
Choose an answer
Copper
Aluminimum
Silver
Tungsten
Iron
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Question # 30
When transistors are used in digital circuits they usually operate in the
Choose an answer
Active region
Breakdown region
Saturation and cutoff regions
Linear region
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Question # 31
The capacitance of a parallel plate capacitor depends upon
Choose an answer
Area of the plates
Separation between the plates
Medium between the plates
All of the above
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