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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
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 # 2
When a constant potential difference is applied across the conductor, the drift velocity of electrons:
Choose an answer
Increases
Decreases
Remains the constant
Either of these
None of these
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Question # 3
Bernoulli's equation is based upon law of conversation
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Mass
Momentum
Energy
None of these
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Question # 4
Plan of a coil makes an angle of 20
º with the lines of magnetic field. The angle between B and vector area of plane of coil is:
Choose an answer
Also 20
º
70
º
90
º
180
º
None of these
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Question # 5
Lyman series in the spectrum of hydrogen exists in the :
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Infra-red region
Visible region
Ultraviolet region
Both(A) and (B)
None of these
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Question # 6
Vibratory motion is always under
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Applied force
Restoring force
Periodic force
Gravitational force
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Question # 7
The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
Choose an answer
voltmeters
resistance
electrode
current
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Question # 8
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 # 9
To sources are said to be coherent if they have:
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Same amplitude
Same wavelength
Definite phase relation with each other
None of them
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Question # 10
With the help of 50 K v electron microscope, a resolution of
Choose an answer
0.5 to 1 m to possible
1 m to 10 m is possible
0.5 to 1 nm is possible
1 to 10 nm is possible
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Question # 11
Work done is maximum when angle between force and displacement is:
Choose an answer
0
°
90
°
180
°
None of these
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Question # 12
Mechanical waves on the surface of a liquid are
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Transverse
Longitudinal
Torsional
both transverse and longitudinal
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Question # 13
A field in which the work done is moving a body along closed path is zero is called:
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Nuclear filed
Conservative field
Gravitational field
Non-conservative field
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Question # 14
Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s
2
Choose an answer
0.064 m
640 cm
64 cm
64 m
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Question # 15
Truth of kinetic energy is confirmed by:
Choose an answer
Diffusion of gases
Brownian motion
Both A and B
None of these
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Question # 16
An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current
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Decreases
Increases
Does not change
Momentarily goes to zero
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Question # 17
The field in which work done is moving body between two points depends upon the path followed is called:
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Conservative filed
Non-conservative field
Electric field
None of these
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Question # 18
A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:
Choose an answer
0
°
30
°
60
°
90
°
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Question # 19
Which one of the following is an example of resonance
Choose an answer
swing
tuning a radio
microwave oven
all of them
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Question # 20
If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity
Choose an answer
Fringe width will decrease
Fringe width will increase
Fringe width will remain unchanged
Fringe will become less intense
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Question # 21
When a conductor is moved across a magnetic field, the redistribution of charge sets up:
Choose an answer
Magnetic field
Electrostatic field
Electromagnetic field
All of these
None of these
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Question # 22
According to slok's law, drag force depends on
Choose an answer
Radius of the spherical body
Terminal velocity of body
Coefficient of viscosity
All of above
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Question # 23
The capacitance of a parallel plate capacitor depends upon
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Area of the plates
Separation between the plates
Medium between the plates
All of the above
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Question # 24
In deriving the Bernoulli's equation, we assume that the fluid is
Choose an answer
incompressible
no viscous
flows in a steady manner
all of them
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Question # 25
The value of the input resistance of OP-AMP is of the order of
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few ohms
few hundred ohms
several kilo ohms
several maga ohms
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Question # 26
The loudness and pitch of a sound note depends on
Choose an answer
Intensity and velocity
Frequency and velocity
Intensity and frequency
Frequency and number of harmonic
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Question # 27
The consumption of energy by a 1000 watt heter in half an hour is:
Choose an answer
5 Kwh
0.5 Kwh
2.5 Kwh
3.2 Kwh
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Question # 28
What is the current is a 2 x 10
6
ohm resistor having a potential difference of 2 x 10
3
volts?
Choose an answer
10
-1
A
10
-2
A
10
-4
A
1 mA
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Question # 29
The restoring force is ______ amd opposite to the applied force within _____:
Choose an answer
Equal, elastic limit
Different, the walls of the laboratory
Different, elastic limit
None of these
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Question # 30
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 # 31
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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