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ECAT Physics Online Test MCQs With Answers
Question # 1
The special theory of relativity treats problems invoving
Choose an answer
inertial frame of references
accelerating frame of references
both of these
none of these
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Question # 2
According to the Bernoulli's theorem the pressure velocity are
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equal to each other
proportional to each other
inversely proportional to each other
none of them
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Question # 3
Motional emf is called motional:
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Electromagnetic force and is measured in newtons
Electromotive force and is measured in volt
Electromotive force and is measured in newtons
Electromagnetic force and is measured in volts
None of these
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Question # 4
A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be
Choose an answer
Zero
g
-g
V + g
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Question # 5
The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called
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diamagnetic substances
ferromagnetic substances
paramagnetic substances
all of them
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Question # 6
Average value of A.C voltage during one cycle is
Choose an answer
1
Zero
Maximum
Variable
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Question # 7
Davision and Germer performed experiment to verify
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de-Brogile hypothesis
theory of relativity
Newton's law of gravitation
Mass-energy relation
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Question # 8
Conversion of A.C. into D.C. is called:
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Reftification
Amplification
Electric induction
Magnetic induction
None of these
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Question # 9
If a ball comes back to its starting point after bouncing off the wall several times, then its
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total displacement is zero
average velocity is zero
none of them
both of them
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Question # 10
The ratio of the gravitational force F
g
to the electrostatic force F
e
between two electrons at the same distance apart is approximately
Choose an answer
9.8
24 x 10
19
24 x 10
42
24 x 10
-44
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Question # 11
At higher frequency of the alternating current, the capacitive reactance X
c
Choose an answer
Increases
Decreases
Remains the same
Increases only when the voltage increases
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Question # 12
A dirty carpet is to be cleaned by heating. This is in according with______law of motion.
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First
Second
Third
None of these
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Question # 13
A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
Choose an answer
64 W
80 W
100 W
125 W
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Question # 14
Magnetic flux and flux density are related by
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Flux density = flux x area
Flux density = flux / area
Flux density = flux - area
None of these
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Question # 15
According to the special theory of relativity
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mass and energy are same entities
mass and energy are same entities but interconverible
mass and energy are different entities but interconverible
mass and energy are different entities but non-interconveritble
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Question # 16
On a cold morning a metal surface will fell colder to touch than a wooden surface, because
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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 # 17
When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called
Choose an answer
energy bands
energy shells
states
all of them
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Question # 18
Neutron was disvovered by:
Choose an answer
Rutherford in 1920
Chadwick in 1922
Bohr in 1913
Compton in 1927
None of these
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Question # 19
To display a digit of EIGHT, the number of ON LED'S are:
Choose an answer
Two
Three
Five
Seven
Eight
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Question # 20
The R
1
= infinity and R
2
= 0, then the gain of non-inverting amplifier is
Choose an answer
zero
infinity
one
any one of these
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Question # 21
The pressure will be low where the speed of the fluid is
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Zero
High
Low
Constant
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Question # 22
If the distance between two charges is doubled, the force between them will become
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Double
Half
Three times
One fourth
One third
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Question # 23
There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as
Choose an answer
maximum frequency
minimum frequency
threshold frequency
all of these
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Question # 24
If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is
Choose an answer
360 m/s
306 m/s
331 m/s
340 ms
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Question # 25
Referring to above figure, a changing current in coil P can be produced:
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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 # 26
the symbol to be used in relativity problems denotes:
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Dilated time
Proper time
Life time
Half time
None of these
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Question # 27
A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)
Choose an answer
2
1
0.5
1.5
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Question # 28
Split rings act as
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Vibrator
Resistor
Motor
Commulator
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Question # 29
When radioactive nucleus emits a
β-particle, the proton-neutron ratio
Choose an answer
decrease
increase
same
none of these
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Question # 30
The earth's potential is taken as
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Negative
Positive
Zero
Infinite
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Question # 31
A massive object falls through a fluid:
Choose an answer
Faster
Slower
Slowest
None
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