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Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
Strictly speaking, the earth is:
Choose an answer
An accelerated frame of reference
A non-inertial frame of reference
An inertial frame of reference
A non-accelerated frame of reference
Both (A) and (B)
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Question # 2
If the velocity time graph is a straight line parallel to time-axis, then it means that:
Choose an answer
The body is moving with uniform velocity
The body is moving with uniform acceleration
The body is at rest
None of above
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Question # 3
The ultimate source of money sources of energy is:
Choose an answer
Sun
Air
Water
Petroleum
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Question # 4
Micheal Faraday and joseph Henry belong respectively to:
Choose an answer
USA and England
England and France
England and USA
USA and France
None of these
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Question # 5
The penetration power of
β-particle is
Choose an answer
zero
less than
α-particle
equal to
α-particle
greater than
α-particle
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Question # 6
The nucleus/nuclei of hydrogen is/are:
Choose an answer
Proton
Deuteron
Triton
All of these
None of these
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Question # 7
In an adiabatic process the work is done at the expense of the
Choose an answer
energy supplied to the system
energy gained from the surroundings
internal energy
none of them
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Question # 8
Whenever a covalent bond breaks, it creates:
Choose an answer
An electron
A hole
An electron-hole pair
A positron
All of these
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Question # 9
Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:
Choose an answer
Maximum
Minimum
Zero
Very small
None of these
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Question # 10
Astrophysics is a branch of physics, which deals with:
Choose an answer
Sub-atomic particles
Stars and galaxies
Light and sound
Music
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Question # 11
The bands below the valence band are
Choose an answer
completely filled and play active part in conduction process
completely filled and plays no part in conduction process
completely filled and play active part in conduction process
not completely filled and play no part in conduction process
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Question # 12
Electrolysis is the study of conduction of electricity through:
Choose an answer
Solids
Liquids
Gases
Plasma
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Question # 13
What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10
-2
Wb, and change in current is 0.01 A?
Choose an answer
2 H
3 H
1/2 H
Zero
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Question # 14
A process in which no heat enters or leaves the system is called
Choose an answer
isochoric process
isothermal process
adiabatic process
none of them
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Question # 15
Which one of the following has larger value of relative permitivity E
r
at room temperature?
Choose an answer
Vaccum
Air
Glass
Water
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Question # 16
The time interval during which the Voltage source changes its polarity once is known as:
Choose an answer
Time period T
Half the time period
Quarter the time period
Two third of the time period
None of these
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Question # 17
In describing function of digital systems, 1 represents:
Choose an answer
Closed switch
True Statement
Lighted bulb
Only (B) and (C)
All are true
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Question # 18
During the upward motion of the projectile, the vertical component of velocity:
Choose an answer
Decreases
Increases
Remains constant
None of these
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Question # 19
Which one is the least multiple
Choose an answer
Pico
Femto
Nano
Atto
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Question # 20
The molecules or ions in a crystalline solids are
Choose an answer
static
not static
randomly moving
all of them
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Question # 21
10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?
Choose an answer
Each have same number of molecules
Don't have same number of molecules
Can't be predicted
None
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Question # 22
The number of vibrating body at any instant from its equilibrium position is called
Choose an answer
displacement
frequency
amplitude
time period
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Question # 23
The space around the earth in which its gravitational force acts on a body is called
Choose an answer
Electric Field
Gravitational field
Magnetic field
Conservative field
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Question # 24
Nucleus of a hydrogen atom may contain:
Choose an answer
One neutron only
Two protons and one neutron
Two protons and two neutrons
Aany of above
One proton only
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Question # 25
Direction of motion _________ in circular motion
Choose an answer
Changes off and on
Changes continously
Does not change
None of them
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Question # 26
In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases
Choose an answer
90
° - 120
°
20
° and 140
°
120
° and 240
°
120
° and 140
°
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Question # 27
In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.
Choose an answer
photo diode
light emitting diode
photo voltaic cell
all of them
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Question # 28
The solids are classified as:
Choose an answer
Metals
Crystalline
Amorphous
Polymeric
All except (A)
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Question # 29
When the bob of simple pendulum is at mean position, its K.E will be
Choose an answer
maximum
minimum
zero
all of them
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Question # 30
The principle of superposition states that
Choose an answer
The total displacement due to several waves is the sum of the displacement due to those waves acting individually
Two stationary waves superimpose to give two progressive waves
A diffraction pattern consists of many interference patterns superimposed on one another
Two progressive waves superimpose to give a stationary wave
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Question # 31
The consumption of energy by a 1000 watt heter in half an hour is:
Choose an answer
5 Kwh
0.5 Kwh
2.5 Kwh
3.2 Kwh
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