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Online Tests
ECAT Pre General Science Physics Online Test MCQs With Answers
Question # 1
Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:
Choose an answer
Is smaller than
Is greater than
Becomes equal to
None of these
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Question # 2
Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:
Choose an answer
Not affected due to its size
Twice that of small size ball
Four times that of small size ball
1/4th of that of small size ball
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Question # 3
Most of the geysers occur in:
Choose an answer
Volcanic regions
Magnetic regions
Northern region
None of these
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Question # 4
When the different streamlines cannot cross each other, then this condition is known as
Choose an answer
continuity condition
turbulent flow condition
steady flow condition
none of them
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Question # 5
The dot product of electric field intensity E and vector area A is called
Choose an answer
Electric potential
Electric flux
Electric field
Magnetic field
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Question # 6
The power factor of resonant series circuit is
Choose an answer
1
0
-1
0.5
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Question # 7
In magnet-coil experiment, emf can be produced by:
Choose an answer
Keeping the coil stationary and moving the magnet
Keeping the magnet stationary and moving the coil
Relative motion of the loop and magnet
Any one of above
All above
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Question # 8
The photocopying process is called:
Choose an answer
Geography
Sonography
Xerography
Zerography
None of these
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Question # 9
An isochoric process is one which take place at
Choose an answer
Constant internal energy
Constant entropy
Constant volume
Constant pressure
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Question # 10
If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:
Choose an answer
Power
Work
Pressure
None of these
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Question # 11
Neutron was disvovered by:
Choose an answer
Rutherford in 1920
Chadwick in 1922
Bohr in 1913
Compton in 1927
None of these
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Question # 12
If the two charges in Coulomb's law have double distance between them, then electric force
Choose an answer
Becomes two-fold
Becomes four-fold
Remains the same
None of these
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Question # 13
Practically the quantity v/c is always:
Choose an answer
less than one
Equal to one
Greater then one
all of these
None of these
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Question # 14
A digital system deals with quantities which has discrete values:
Choose an answer
Two in number
One in number
Three in number
Four in number
None of these
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Question # 15
Resolving power in mth order diffraction for grating is given by:
Choose an answer
R = N/m
R = m/N
R = N x m
None of these
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Question # 16
The resistance offered by a fluid to a solid moving inside it is called:
Choose an answer
Drag force
Surface force
Viscosity
None of these
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Question # 17
The arrangement or molecules or atoms in a crystalline solid can be studied by using:
Choose an answer
Chemical methods
Neutrons
X-ray techniques
Copper atoms
Both (A) and (B)
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Question # 18
The waves which propagate out in the space due to oscillations of electric and magnetic fields are called:
Choose an answer
Mechanical waves
Electromagnetic waves
Matter waves
All of them
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Question # 19
The vector is space has:
Choose an answer
One Component
Two Compnents
Three Components
Non of these
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Question # 20
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 # 21
An emf is set up in a conductor when it
Choose an answer
Is kept in a magnetic field
Is kept in an electric field
Moves across a magnetic field
Both A and B
None of these
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Question # 22
Inertial frame of references are those frame of references which are moving with
Choose an answer
increasing velocity
decreasing velocity
constant velocity
all of them
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Question # 23
The minimum resistance that can be obtained by connecting 5 resistance of 1/4
Ω
each is
Choose an answer
4/5
Ω
5/4
Ω
20
Ω
0.05
Ω
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Question # 24
The relationship between Boltzmann constant k with R and N
A
is given as:
Choose an answer
k = RN
A
k =R/N
A
k = NR/N
A
None of these
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Question # 25
The velocity of falling raindrops attains limited value because of
Choose an answer
Up thrust of air
Air currents of the earth atmosphere
Surface tension effect
Viscous force exerted by air
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Question # 26
Capacitance of two or more capacitors
Choose an answer
Increases in series combination
Increases in parallel combination
Remains unchanged
None of the above
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Question # 27
Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
Choose an answer
ON switch
off switch
function switch
none of these
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Question # 28
If the absolute uncertainty of an instrument is 0.0a1 cm, then its least count will be :
Choose an answer
0.005 cm
0.01 cm
0.02 cm
0.001 cm
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Question # 29
If a force of 0.05 N produces an elongation of 20 mm in string, then its spring constant will be:
Choose an answer
250 N m
-1
25 N m
-1
2.5 N m
-1
None of these
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Question # 30
If a ball comes back to its starting point after bouncing off the wall several times, then its
Choose an answer
total displacement is zero
average velocity is zero
none of them
both of them
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Question # 31
The unit of spring constant is:
Choose an answer
J-sec
Metre
Nm
-1
None of these
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