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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
The general theory of relativity treats problems involving
Choose an answer
inertial frame of references
accelerating frame of references
both of these
none of these
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Question # 2
The machines which deals with the objects moving with velocities approaching that of light is called:
Choose an answer
Relativistic mechanics
Wave mechanics
Quantum
Statics mechanics
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Question # 3
Referring to above figure, due to change in current in the coil P, the change in magnetic flux:
Choose an answer
Is associated with coil P
Is associated with coil S
Causes an induced current is coil S
All of these
None of these
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Question # 4
When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:
Choose an answer
Starts increasing
Starts decreasing
Becomes constant
Is called escape velocity
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Question # 5
The efficiency of petrol engine is usually not more than 25% to 30% because of
Choose an answer
friction
heat losses
both of them
none of them
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Question # 6
When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates
Choose an answer
Decreases
Increases
No change
May increase or decresase
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Question # 7
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 # 8
The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
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3 more neutrons
3 more electrons
3 more protons
3 more ions
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Question # 9
To see the minor details of the object by microscope, it should have:
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High magnifying power
High resolving power
Am objective of larger focal length
None of these
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Question # 10
From the theory of relativity, momentum p of the photon is related to energy as
Choose an answer
p = hfc
p = hf/c
p = f(hc,f)
p = cf/h
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Question # 11
The property of light which does not change with the nature of the medium is:
Choose an answer
Frequency
Amplitude
Wavelength
None of these
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Question # 12
At low speeds, the drag force is
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proportional to speed
inversely proportional to speed
not simply proportional to speed
none of them
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Question # 13
A 2 kg block is held 1 m above floor for 50 seconds. The work done is:
Choose an answer
Zero
10.2 J
100 J
980 J
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Question # 14
The decrease in velocity per unit time is called:
Choose an answer
Variable Acceleration
Average Acceleration
Retardation
None of these
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Question # 15
In equation F=ma, then mass 'm' is
Choose an answer
rest mass
variable mass
inertial mass
gravitational mass
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Question # 16
The flow of an ideal fluid is
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streamline flow
incompressible flow
non-viscous
all of the above
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Question # 17
Direction of motion ______ in circular motion:
Choose an answer
Changes off and on
Changes continuously
Does not change
None of them
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Question # 18
A body moving with an acceleration of 5 m/sec
2
started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?
Choose an answer
150 m
250 m
350 m
400 m
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Question # 19
When a nucleus emits an alpha particle, it atomic mass decreased by
Choose an answer
2
1
4
3
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Question # 20
Pressure may be define as _______ per second per unit area:
Choose an answer
Change in force
Change in momentum
Change in energy
Work done
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Question # 21
The energy of the 4th orbit in hydrogen atom is
Choose an answer
2.5 ev
- 3.5 ev
-0.85 ev
-13.6 ev
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Question # 22
If a mass of 10 gm is suspended from a spring of k = 9.8 Nm
-1
, then the extension will be:
Choose an answer
1 cm
1 m
10 mm
None of these
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Question # 23
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 # 24
A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:
Choose an answer
The coil is destroyed
The coil is Rotated
The coil is neither destroyed nor rotated
Both (A) and (B)
None of these
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Question # 25
A projectile on its path gets divided into two pieces at its highest point. Which is true?
Choose an answer
Momentum increases
Momentum decreases
Kinetic energy increases
Kinetic energy decreases
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Question # 26
If work is done at the rate of 2 k j per second, then total work done is half an hour will be:
Choose an answer
0.5 Kwn
2 Kwh
1 Kwh
None of these
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Question # 27
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 # 28
Heavy water is made of one oxygen atom and two atoms of:
Choose an answer
Protium
Deuterium
Tritium
Any of these
None of these
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Question # 29
During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with
Choose an answer
maximum speed
zero speed
maximum speed
none of them
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Question # 30
The current through a metallic conductor is due to the motion of
Choose an answer
protons
neutrons
electrons
free electrons
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Question # 31
The displacement of body executing SHM is
Choose an answer
x
o
coswt
x
o
sinwt
x
o
sin
2
wt
Both A, B
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