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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
The maximum stress that a material can withstand, is known as
Choose an answer
plastic point
elastic limit
yield point
ultimate tensile strength
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Question # 2
The liquid which conduct current is known as
Choose an answer
heating effect
chemical energy
electrolyte
ohm's law
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Question # 3
The basic circuit element in a d.c. circuit is a/an
Choose an answer
Inductor
Resistor
Capacitor
Battery
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Question # 4
The counter, which also provides the power to the G.M. tube is called:
Choose an answer
Thin mica window
thin glass window
Airy window
Wooden window
None of these
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Question # 5
Resistance of a conductor is increased, the currant will
Choose an answer
Decrease
Increase
Remain the same
None of these
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Question # 6
Diameter of the atom is of the order of
Choose an answer
10
-10
m
10
-12
m
10
-15
m
10
-9
m
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Question # 7
Which of the following diodes can operate in the reverse biased condition
Choose an answer
photo diode
light emitting diode
photo voltaic cell
none of these
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Question # 8
The chemical properties of all the isotopes of an elements are
Choose an answer
same
different
slightly different
none of these
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Question # 9
A body is moving through a viscous medium eventually comes to rest because of:
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Force of gravity
Force of friction
Its weight
Both A and C
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Question # 10
A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be
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2 R
R
R/2
R/4
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Question # 11
The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by
Choose an answer
F =q(v/B)
F=q
2
(v x B)
F=q(v x B)
F= vx B
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Question # 12
Where the streamlines are very far apart from each other, the pressure will be
Choose an answer
low
zero
high
all of them
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Question # 13
The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at
Choose an answer
100 K
273 K
0 K
-273 K
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Question # 14
A body whose momentum is constant must have constant
Choose an answer
Acceleration
Velocity
Force
None of these
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Question # 15
The efficiency of petrol engine is usually not more than 25% to 30% because of
Choose an answer
friction
heat losses
both of them
none of them
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Question # 16
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 # 17
Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
Choose an answer
polonium uranium
uranium and radium
polonium and radium
none of these
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Question # 18
The value of the plank's constant 'h' is given by
Choose an answer
1.6 x 10
-19
J
1.67 x 10
-27
Kg
6.63 x 10
34
Js
6.63 x 10
-34
Js
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Question # 19
Monochromatic light means waves of:
Choose an answer
Same frequency
Same colour
Same wavelength
All of them
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Question # 20
One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is
Choose an answer
0.1 V
8 V
2 V
0.5 V
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Question # 21
According to slok's law, drag force depends on
Choose an answer
Radius of the spherical body
Terminal velocity of body
Coefficient of viscosity
All of above
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Question # 22
Laplace formula is derived from
Choose an answer
Isothermal change
Adiabatic change
Isobaric change
None of these
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Question # 23
Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:
Choose an answer
45 V
15 V
90 V
300 V
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Question # 24
If one volt is needed to cause a current of one ampere to flow in a conductor, its resistance is
Choose an answer
one ohm
one joule
one volt
one ampere
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Question # 25
When a body moves with a constant speed in a circle:
Choose an answer
No work is done on it
No acceleration is produced in the body
Velocity remains constant
None of these
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Question # 26
A process which can be retraced in exactly reverse order, without producing any change in the surroundings is called
Choose an answer
reversible process
irreversible process
any one of them
none of them
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Question # 27
The law of electromagnetic induction is related to:
Choose an answer
Coulomb
Ampere
Faraday
Lenz
None of these
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Question # 28
The maximum possible error in the reading of an instrument is ______ its least count.
Choose an answer
Half of
Quarter of
Equal to
Double than
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Question # 29
The concept of direction is purely:
Choose an answer
Absolute
Relative
Relative to stars always
Relative to the sun always
None of these
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Question # 30
The magnifier forms a virtual image of the object at:
Choose an answer
Least distance of distinct vision
Much farther than the least distance
Both A and B are correct
None of these
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Question # 31
In the formula R = N x m for diffraction grating, N denotes:
Choose an answer
No. of lines/cm
No. of lines/meter
Total number of lines
None of above
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