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ECAT Physics Online Test MCQs With Answers
Question # 1
A massive object falls through a fluid:
Choose an answer
Faster
Slower
Slowest
None
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Question # 2
β-particles are easily deflected by collisions than heavy
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α-particles
β-particles
γ-particles
none of these
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Question # 3
If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?
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60 W bulb
100 W bulb
Both equally
None of these
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Question # 4
Resistor is a device which convert electric energy to
Choose an answer
Heat energy
Chemical energy
Elastic energy
All of the above
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Question # 5
If the time period a simple pendulum is 2 s, its frequency would be
Choose an answer
2 Hz
1.5 Hz
1.0 Hz
0.5 Hz
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Question # 6
The first super conductor was discovered in
Choose an answer
1811
1890
1901
1911
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Question # 7
The material in the form of wire or rod or plate which leads the current into or cut of the electrolyte is known as
Choose an answer
voltmeters
resistance
electrode
current
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Question # 8
In a transistor, the central region is called
Choose an answer
collector
emitter
base
none of them
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Question # 9
The nature of thermal radiation is similar to:
Choose an answer
Ultraviolet rays
Light rays
Both of them
None of these
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Question # 10
SI unit of wave length is:
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Kilometer
Metre
Centimetre
Hertz
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Question # 11
For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to
Choose an answer
Four times
Thrice
Once
Twice
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Question # 12
Most practical applications of electricity involve
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Charges at rest
Charges in motion
Electrons at rest
Atoms in motion
Molecules in motion
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Question # 13
A reversible cycle is the one in which
Choose an answer
some of the changes are reversible
all of the changes are reversible
all of the changes are irreversible
none of them
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Question # 14
The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10
-15
is
Choose an answer
9 x 10
5
V
9 V
8 x 10
6
V
80 V
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Question # 15
The efficiency of diesel engine is
Choose an answer
25%
25 - 30%
35%
35 - 40%
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Question # 16
The value of relative permittivity of different dielectrics are
Choose an answer
Equal
Different
Greater than one
Smaller than one
Both B and C
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Question # 17
When current passes through a solenoid coil, it behaves like a
Choose an answer
loop
circle
bar magnet
none of these
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Question # 18
A beam of electrons is provided by an
Choose an answer
electron gun
Suppray
Injection
None of these
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Question # 19
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 # 20
In gases, the charge carriers are:
Choose an answer
Electrons
Positive ions
Negative ions
Both A and C
Both A and B
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Question # 21
The smooth or steady streamline flow is known as
Choose an answer
laminar flow
turbulent flow
both of them
none of them
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Question # 22
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 # 23
Conversion of alternating current into direct current is called
Choose an answer
amplification
rectification
conduction
polarization
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Question # 24
Heat travels through vacuum by
Choose an answer
Conduction
Convection
Radiation
Both A and B
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Question # 25
0.10 cm can be written as:
Choose an answer
1.0 x 10
-2
m
1.0 x 10
-3
cm
1.0 x 10
-4
cm
1. x 10
-4
m
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Question # 26
In an A.C circuit with resistor only, the current and voltage have a phase angle of
Choose an answer
90
°
0
°
180
°
none of these
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Question # 27
The second law of thermodynamics is concerned with the circumstances in which
Choose an answer
heat can be converted into work
direction of flow of heat
none of them
both of them
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Question # 28
The practical application of the phenomenon of Mutual induction is
Choose an answer
Transformers
Generator
Motor
All of these
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Question # 29
If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be
Choose an answer
Increasing by a factor of 2
Decreasing by a factor of 2
Decreasing by a factor of 4
Unchanged
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Question # 30
Flurescent screen is a screen where visible spot
Choose an answer
vanishes
is made
becomes small and large
none of these
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Question # 31
We cannot utilize the heat contents of oceans and atmosphere because
Choose an answer
there is no reservoir at the same temperature
there is no reservoir at the temperature lower than any one of two
there is no reservoir at the temperature higher than any one of two
none of them
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