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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
A convex lens acts as diverging lens when the object is placed:
Choose an answer
Between F and 2F
At 2F
With focal length
Beyond 2F
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Question # 2
A current of 1.6 A is passed through a solution of CuSO
4. How many Cu
2+
ions are liberated in one minute?
Choose an answer
3 x 10
20
3 x 10
10
6 x 10
20
6 x 10
10
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Question # 3
Centripetal acceleration is also called _______ acceleration:
Choose an answer
Tangential
Radial
Angular
None of them
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Question # 4
The amplifier which us used to perform mathematical operations electronically is known as
Choose an answer
calculator
OP-AMP
computer
any one of them
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Question # 5
The output voltage of half wave rectification is in the form of
Choose an answer
a smooth curve
a smooth wave
pulses
all of the above
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Question # 6
Transverse waves can be set up:
Choose an answer
Solids
Liquids
Gases
All of them
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Question # 7
Conversion of alternating current into direct current is called
Choose an answer
amplification
rectification
conduction
polarization
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Question # 8
While describing the motion of a simple pendulum, the frictional effects are
Choose an answer
taken into account
completely ignored
partially ignored
none of them
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Question # 9
Inertia mass and gravitational mass are
Choose an answer
opposite
identical
identical when there is no friction
all of them
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Question # 10
Referring to above figure, a changing current in coil P can be produced:
Choose an answer
At the instant the switch is closed
At the instant the switch is opened
With the help of rheostat
All of these
None of these
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Question # 11
Braking radiation causes:
Choose an answer
Continuous spectrum
Line Spectrum
Band spectrum
Discrete specturm
All of these
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Question # 12
Average KE of a gas molecule has:
Choose an answer
Direct relation with absolute temperature and inverse relation with pressure
Direction relation with both absolute temperature and pressure
Inverse relation with both absolute temperature and pressure
None of these
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Question # 13
The product of the pressure and volume of an ideal gas is
Choose an answer
A constant
Approximately equal to the universal gas constant
Directly proportional to its temperature
Inversely proportional to its temperature
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Question # 14
An amount of water of mass 20 g at 0
°C is mixed with 40 g of water at 10
°C. Final temperature of mixture is
Choose an answer
-20
°C
6.67
°C
5
°C
0
°C
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Question # 15
If the distance between two charges is doubled, the force between them will become
Choose an answer
Double
Half
Three times
One fourth
One third
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Question # 16
Light year is a unit of:
Choose an answer
Time
Distance
Velocity
Intensity of light
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Question # 17
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 # 18
Electromagnetic waves transport:
Choose an answer
Energy only
Momentum only
Both A and B are correct
None of is correct
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Question # 19
When two objects come to common temperature, the body is said to be in:
Choose an answer
Static equilibrium
Dynamic equilibrium
Thermal equilibrium
None of these
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Question # 20
The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called
Choose an answer
Mutual induction
Mutual inductance
Capacitance
Self inductance
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Question # 21
The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called
Choose an answer
diamagnetic substances
ferromagnetic substances
paramagnetic substances
all of them
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Question # 22
The amplitude of oscillation of each atom in a metallic crystal rises with the
Choose an answer
rise in temperature
decrease in temperature
even temperature remains constant
all of them
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Question # 23
Two point charges A and B separated by a distance R attract each other with a force of 12 x 10
-3
N. The force between A and B when the charges on them are doubled and distance is halved
Choose an answer
1.92 N
19.2 N
12 N
0.192 N
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Question # 24
On a cold morning a metal surface will fell colder to touch than a wooden surface, because
Choose an answer
Metal has high specific heat
Metal has high thermal conductivity
Metal has low specific heat
Metal has low thermal conductivity
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Question # 25
The closed loop gain of the non-inverting amplifier is given by
Choose an answer
G = R
2
/R
1
G = -R
2
/R
1
G = 1 - R
2
/R
1
G = 1 + T
2
/R
1
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Question # 26
Magnetic lines of force:
Choose an answer
Cannot intersect at all
Intersect at infinity
Intersect within magnet
Intersect at Neutral Point
None of these
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Question # 27
The motion of molecules in gases is:
Choose an answer
Orderly
Random
Circular
All of these
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Question # 28
The rain drop falling from the sky reach the ground with
Choose an answer
Constant terminal velocity
Constant gravitational acceleration
Variable acceleration
acceleration greater than g
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Question # 29
A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?
Choose an answer
0.1 m/s
10 m/s
1 m/s
0.01 m/s
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Question # 30
If the length of the conductor is double and its cross sectional area is halved, its conductance will
Choose an answer
Increase four fold
Become one-fourth
Become one-half
Remains unchanged
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Question # 31
When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called
Choose an answer
incompressible
compressible
viscous
non viscous
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