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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
A railway engine (mass 10
4
kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is
Choose an answer
3,600 N
7,200 N
10,000 N
100,000 N
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Question # 2
The vector representation of force experience give the direction of
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magnetic field
current
length of conductor
force
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Question # 3
Si units of time period is
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second
hertz
revolution
vibration/sec
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Question # 4
A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is
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C
C/2
Zero
2C
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Question # 5
The equation of continuity is
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A
1
A
2 = V
1
V
2
A
1/
V
1 =
A
2/
V
2
V
1/
A
1=
V
2/
A
2
A
1
V
1 =
A
2
V
2
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Question # 6
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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Question # 7
The phenomenon of generation of induced emf is called:
Choose an answer
Electrostatic induced
Magnetic induced
Electromagnetic induced
Electric induced
Both A and C
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Question # 8
If one newton force acts on a body and displaces the body through 1m work done on body is
Choose an answer
1 dyne
1 joule
1KJ
1 Watt
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Question # 9
In a heat engine, heat is supplied by the
Choose an answer
cold reservoir
sink
hot reservoir
none of them
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Question # 10
The focal length of convex lens having magnifying power of 5.55 is:
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5.5 cm
5 cm
4.5 cm
6 cm
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Question # 11
If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get
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diffraction
beat
interference
resonance
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Question # 12
Within each domain, the magnetic field of all the spinning electrons are
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parallel
antiparallel
perpendicular
all of them
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Question # 13
If the two charges in Coulomb's law have double distance between them, then electric force
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Becomes two-fold
Becomes four-fold
Remains the same
None of these
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Question # 14
At the present time, the main frontiers of fundamental science are
Choose an answer
2
3
4
5
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Question # 15
Which of the following is not an example of intertial frame
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a body placed on the surface of earth
a body placed in a car moving with uniform velocity
a body placed in a car moving with same acceleration
none of these
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Question # 16
The inside cavity of the black body is
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painted white
painted silver
blackened with soot
painted red
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Question # 17
According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area
Choose an answer
decreases
increases
becomes zero
none of them
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Question # 18
Radioactivity was discovered by
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Rutherford
Henri Becqureal
Maxwell
James Chadwick
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Question # 19
A full-scale deflection is obtained in a galvanometer with a current of few
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ampere
volts
milliampere
ohm
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Question # 20
Escape velocity from surface of Moon as compared to that from Earth surface is:
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Greater
Smaller
Equal
None of thes
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Question # 21
Gaussian surface is always:
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Rectangular
Spherical
Cylindrical
Box shape
Any of these
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Question # 22
The example of reversible process is
Choose an answer
an explosion
changes occur suddenly
slow compression of a gas
all of them
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Question # 23
Distance to nearest galaxy from earth is
Choose an answer
10
10
m
10
15
m
10
40
m
10
30
m
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Question # 24
The value of the metastable state for Neon is
Choose an answer
20.66eV
20.61eV
19.23eV
18.70eV
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Question # 25
Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
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11.0 ohm
1.0 ohm
7.0 ohm
3.0 ohm
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Question # 26
If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be
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1/3 V
2/3 V
3/2 V
3V
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Question # 27
The angular speed of a particle moving along a circular path is 5 Pie rad sec
-1
, Its period of motion is:
Choose an answer
2.5 sec
0.06 sec
15.7 sec
0.4 sec
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Question # 28
In which of the following components, pn-junction is used
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light emitting diode
photo diode
photo voltaic cell
all of these
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Question # 29
Taking the earth to be a spherical conductor of diameter 12.8 x 10
3
km. Its capacity will be
Choose an answer
711
μ
F
611
μ
F
811
μ
F
511
μ
F
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Question # 30
A diatomic gas molecule has
Choose an answer
translational energy
rotaional energy
vibrational energy
all of them
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Question # 31
Neutron was discovered by
Choose an answer
Curie
Roentgen
Chadwick
Rutherford
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