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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:
Choose an answer
Longitudinal waves
Transverse waves
Water waves
Complex waves
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Question # 2
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 # 3
A photon is considered to have
Choose an answer
Momentum
Energy
Wavelength
All of the above
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Question # 4
Direction of motion _________ in circular motion
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Changes off and on
Changes continously
Does not change
None of them
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Question # 5
When a conductor moved with its length parallel to the lines of magnetic fled:
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An emf is induced across its ends
Emf induced is similar to that of a battery
Emf passes through the conductor
Both A and B
None of these
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Question # 6
The cause of mirage observed in deserts in bright sunlight is due to
Choose an answer
Refraction of light
Reflection of light
Scattering of light
Total internal reflection of light
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Question # 7
The surface destiny of charge is defined is:
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Charge per volume
Mass per volume
Charge per area
Mass per area
Both (B) and (C)
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Question # 8
If the two charges in Coulomb's law have double distance between them, then electric force
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Becomes two-fold
Becomes four-fold
Remains the same
None of these
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Question # 9
The highest efficiency of a heat engine whose low temperature is 17
°C and the high temperature is 200
°C is
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70%
100%
35%
38%
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Question # 10
Work is a Quantity
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Vector
Scalar
Non-physical
None of these
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Question # 11
One radian is equal to:
Choose an answer
30.3
°
45.3
°
50.3
°
57.3
°
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Question # 12
When velocity of moving body is doubled, the quantity which is also doubled is its:
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K.E.
Acceleration
Momentum
P.E.
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Question # 13
Which one of the following physical quantities changes with relativistic speed
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Length
Mass
Time
All of the above
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Question # 14
Velocity is a
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scalar quantity
vector quantity
constant quantity
none of them
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Question # 15
If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is
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2 : 1
4 : 1
1 : 4
3 : 4
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Question # 16
Structure of the nucleus was explained by
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J.J Thomson
Bohr
Millikan
Rutherford
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Question # 17
dimensions are the same for:
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Work and energy
Force and weight
None of these
Both a and b
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Question # 18
A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about
Choose an answer
80 m
20 m
160 m
40 m
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Question # 19
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 # 20
Two forces each of the magnitude F act perpendicular to each other. The angle made by the resultant force with the horizontal will be:
Choose an answer
30
°
45
°
60
°
90
°
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Question # 21
The number of "Earth stations" which transmit signals to satellites and receive signals from them are:
Choose an answer
3
24
126
200
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Question # 22
An electronic computer is basically a vast arrangement of electronic switches which are made from
Choose an answer
Resistors
Transistors
N -type crystals
P-Type crystals
Capacitors
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Question # 23
The shell closer to the nucleus is called:
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N shell
L shell
K shell
M shell
O shell
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Question # 24
Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:
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Rope
Coil of spring
Water
All of them
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Question # 25
In solids, only following type/s of wave can travel:
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Transverse
Longitudinal
Both A and B
None of them
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Question # 26
The Space around the Earth within which it exerts a force of attraction on other bodies is known as
Choose an answer
Nuclear field
Conservative field
Electric field
Gravitational field
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Question # 27
Coulomb force, when any material medium is placed between two charges
Choose an answer
Increases
Decreases
Remain unchanged
None of these
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Question # 28
The L-C parallel circuit the capacitor draws a
Choose an answer
leading current
lagging current
main current
none of these
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Question # 29
Which one of the following phenomenon cannot be explained on the bases of Huygen's theory
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Refraction
Reflection
Diffraction
Formation of spectrum
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Question # 30
The maximum possible error in the reading of an instrument is ______ its least count.
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Half of
Quarter of
Equal to
Double than
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Question # 31
According to the special theory of relativity
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mass and energy are same entities
mass and energy are same entities but interconverible
mass and energy are different entities but interconverible
mass and energy are different entities but non-interconveritble
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