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Online Tests
ECAT Pre General Science Physics Online Test MCQs With Answers
Question # 1
The image of an object 5 mm length is only 1 cm high. The magnification produced by lens is:
Choose an answer
1
0.2
2
0.1
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Question # 2
If the displacement of a body executing S.H.M is plotted against time, then the curve is known as
Choose an answer
frequency of S.H.M
period of S.H.M
wave form
none of them
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Question # 3
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 # 4
The resistance of 20 cm long wire is 10
Ω
. When the length is changed to 40 cm. The new resistance is
Choose an answer
10
Ω
20
Ω
30
Ω
40
Ω
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Question # 5
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 # 6
The conduction band in a solid
Choose an answer
may be empty
cannot be empty
should be filed
all of them
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Question # 7
An ideal choke (used along with fluorescent tube) would be
Choose an answer
A pure resistor
A pure capacitor
A pure inductor
A combination of an inductor and a capacitor
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Question # 8
Since the absolute scale is independent of the property of the working substance, hence, can be applied at
Choose an answer
very high temperature
very low temperature
any one of them
none of them
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Question # 9
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 # 10
When the surfaces are coated with a lubricant, then they
Choose an answer
Stick to each other
Slide upon each other
Roll upon each other
None of these
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Question # 11
A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
Choose an answer
2R
4R
16R
Zero
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Question # 12
According to Huygen's principle
Choose an answer
light travels in straight line
Light is a transvers wave
Light has dual nature
All points on the primary wave-front are the sources of secondary wavelets
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Question # 13
The expression for restoring force is
Choose an answer
F=ma
F=kx
F= -kx
Kx=ma
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Question # 14
The range of particle depends upon the factor
Choose an answer
charge, mass and energy of particle
density of medium
ionization potential of the atoms
all the above
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Question # 15
Substances that do not flow easily have
Choose an answer
large coefficient of viscosity
small coefficient of viscosity
either of them
none of them
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Question # 16
At the starting point of the free fall motion of an object, its acceleration will be
Choose an answer
maximum
minimum
zero
none of them
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Question # 17
Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
Choose an answer
3R
Ω
2R/4
Ω
R/3
Ω
2R/3
Ω
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Question # 18
The horizontal component of a projectile moving with initial velocity of 500 ms
-1
at an angle 60
° to x-axis is
Choose an answer
500 ms
-1
1000 ms
-1
250 ms
-1
Zero
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Question # 19
The waveform of alternating voltage is a:
Choose an answer
Square
Rectangular
Saw-tooth
Sinusoidal
None of these
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Question # 20
If force and displacement are in opposite direction, the work done is taken as
Choose an answer
Positive work
Negative work
Zero work
Infinite work
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Question # 21
Peak value of alternative current is:
Choose an answer
one of its Instantaneous value
Equal to its RMS value
The same as its peak-to-peak value
Both (B) and (C)
None of these
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Question # 22
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 # 23
To hear a clear echo, the reflecting surface must be at a minimum distance of
Choose an answer
10 m
16.5 m
33 m
66 m
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Question # 24
The number of vibration in two seconds can be expressed as
______ of frequency of vibration is f:
Choose an answer
f
2 f
3 f
1/2 f
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Question # 25
Magnetic effect of current is used:
Choose an answer
In electric motor
To detect current
To measure current
All of these
None of these
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Question # 26
The force exerted by the fluid in a hydraulic pump on the piston is 10 cm
2
, the fluid pressure on the piston is, in N/cm
2
Choose an answer
20
200
2000
20,000
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Question # 27
Density is defined as:
Choose an answer
Mass per volume
Volume per mass
Mass X volume
Mass per length
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Question # 28
Work is always done on a body when:
Choose an answer
A force acts on it
It moves through certain distance
None of A or B is correct
Both A and B is correct
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Question # 29
The electric field, magnetic field and the direction of their propagation are mutually
Choose an answer
perpendicular
parallel
none of these
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Question # 30
In the same medium, velocity of the wave:
Choose an answer
Goes on increasing
Remains constant
Goes on decreasing
None of these
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Question # 31
The power dissipation in a pure inductive or capacitance circuit is
Choose an answer
maximum
positive
zero
none
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