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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
Teh consumption of energy by a 1000 watt heater in half an hour is:
Choose an answer
5 Kwh
0.5 Kwh
2.5 Kwh
3.2 Kwh
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Question # 2
Ohm's law states that
Choose an answer
The current through a resistor is directly proportional to the applied voltage
The voltage across a resistor is directly proportional to the current passing through it
Resistance is the constant of proportionality between the voltage and current
all of these
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Question # 3
The curve representing an isothermal process is called
Choose an answer
adiabat
isotherm
fixed temperature
none of them
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Question # 4
If the acceleration of a body is negative, then slope of the velocity-time graph will be:
Choose an answer
Zero
Positive
Negative
Infinity
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Question # 5
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 # 6
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 # 7
A mass of 5kg moves with an acceleration of 10m s
-2
force applied is
Choose an answer
10
N
50
N
2
N
20
N
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Question # 8
The magnitude of the displacement is a line from initial position to final position which is
Choose an answer
straight
curved
either be curved or straight
none of them
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Question # 9
The velocity of sound in air not effected by changes in
Choose an answer
Moisture contents in air
Temperature of air
The atmosphere pressure
The composition of air
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Question # 10
The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is
Choose an answer
Q=V/C
Q=C/V
Q=1/2CV
Q=CV
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Question # 11
Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of
Choose an answer
photoelectric effect
pair production
Compton effect
uncertainty principle
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Question # 12
Moment of linear momentum is called.
Choose an answer
Moment arm
Moment of inertia
Inertia
Angular momentum
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Question # 13
When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called
Choose an answer
thermoionic electrons
free electrons
photoelectrons
slow electrons
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Question # 14
Depletion region contains:
Choose an answer
Protons
Positive ions
Negative ions
Both (B) and (C)
Both (A) and (C)
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Question # 15
The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90
° with the force of the smaller magnitude, then their magnitudes are
Choose an answer
3, 15
4, 14
5, 13
6, 12
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Question # 16
The value of threshold frequency for different metals is
Choose an answer
different
same
may be different or may be same
none of these
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Question # 17
Which of the following is most suitable as the core of transformer
Choose an answer
Soft iron
Alinco
Steel
None of these
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Question # 18
Which one is the least multiple:
Choose an answer
Pico
Femto
Nano
Atto
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Question # 19
Pressure exerted by a gas is
Choose an answer
Independent of density of the gas
Inversely proportional to the density of the gas
Directly proportional to the square of the density of the gas
Directly proportional to the density of the gas
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Question # 20
Total number of turns on 0.15 m length solenoid is 300. the value of n is:
Choose an answer
Greater than 300
Smaller than 300
Equal to 300
Any of (A) or (B)
Any of (A) or(C)
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Question # 21
When a water droplet falling freely through air, the drag force on water droplet increases with th
Choose an answer
decrease in speed
increase in speed
pressure
none of them
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Question # 22
Force is a:
Choose an answer
Scalar quantity
Base quantity
Derived quantity
None of these
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Question # 23
The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is
Choose an answer
100 ev
10
6
e v
10
3
e v
1.0 e v
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Question # 24
For measuring large currents, an ordinary galvanometer cannot be used without proper, then both relates with each other as
Choose an answer
modification
voltage
current
resistance
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Question # 25
One radian is equal to:
Choose an answer
30.3
°
45.3
°
50.3
°
57.3
°
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Question # 26
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 # 27
Under the elastic region, the deformation produced in the material, the deformation produced in the material will be
Choose an answer
permanent
temporary
either of them
none of them
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Question # 28
During the positive half-cycle in the half-wave rectification,the diode
Choose an answer
does not conduct
conducts
either of these
neither of these
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Question # 29
For the normal operation of the transistor, its
Choose an answer
emitter-base and collector base junctions are forward biased
emitter-base junction is reversed biased and collector base junction is forward biased
emitter-base junction is forward biased and collector-base junction is reverse biased
any one of these
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Question # 30
According to Rutherford atomic model, the positive charge in an atom
Choose an answer
is concentrated at its centre
is in the form of positive electron at same distance from its centre
is spread uniformly through its volume
none of these
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Question # 31
The velocity of a body at any instant of its motion is known as
Choose an answer
average velocity
instantaneous velocity
uniform velocity
none of them
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