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Online Tests
Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
The speed of randomly moving electrons depends upon
Choose an answer
pressure
volume
temperature
mass
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Question # 2
Biomass includes:
Choose an answer
Crop residue
Natural vegetation
Animal dung
All of these
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Question # 3
The SI unit of spring constant is identical with that of
Choose an answer
Force
Surface tension
Pressure
Loudness
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Question # 4
When low energy photon interact with a metal,which of the following effect is likely to be taken place
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pair production
photoelectric
Compton effect
None of these
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Question # 5
The waves which propagate by the collision of material particles are known as
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e.m. waves
mechanical waves
light waves
microwaves
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Question # 6
If a 40 watt light bulb burns for 2 hours. how much heat is generated
Choose an answer
288 x 10
3
J
288 x 10
8
J
288 x 10
5
J
288 x 10
6
J
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Question # 7
When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is
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0.5 J
2 J
0.25 J
1 J
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Question # 8
Spectrum represents the number of component colours present in certain light in terms of:
Choose an answer
Wavelength
Frequency
Energy
Both (A) and (B)
All of these
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Question # 9
Time period of a simple pendulum depends upon the
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length of the pendulum
acceleration due to gravity
none of them
both of them
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Question # 10
The magnitude of induced emf depends upon the
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Rate of decrease of magnetic field
Rate of change of magnetic field
Rate of increase of magnetic flux
Constancy of magnetic field
None of these
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Question # 11
Which of the following substances has got positive temperature coefficient of resistance?
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Carbon
Germanium
Silicon
Aluminium
None of these
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Question # 12
The r.m.s value of a.c. current is always
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positive
negative
zero
all of these
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Question # 13
Which quantity has the same units as impulse
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force
work
linear momentum
acceleration
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Question # 14
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 # 15
For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
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A - Z
A + Z
Z
A
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Question # 16
The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
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Lummer
Planck
Pringsheim
Both (A ) and (B)
Both (A) and (C)
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Question # 17
If a given spring of spring constant k is cut into two indentical segments, the spring constant of each segment is:
Choose an answer
k/2
2 k
4 k
None of these
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Question # 18
Satellites are held in orbits around Earth by its:
Choose an answer
Gravitational field
Magnetic field
Own orbital motion
Own spin motion
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Question # 19
Conventionally the angular velocity is directed to an angle of:
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90
° to the axis of rotation
30
° to the axis of rotation
0
° to the axis of rotation
None of the above
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Question # 20
To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined
Choose an answer
Parallel
Antiparallel
At angle 60
°
Perpendicular to each other
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Question # 21
CRO deflects the beam of
Choose an answer
proton
a-particle
electron
neutron
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Question # 22
Which of the following represents an electric current?
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C
-1
CS
-1
J.S
-1
dynes
-1
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Question # 23
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 # 24
Semi-conductor elements have atoms with
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2 valence electrons
3 valence electrons
4 valence electrons
5 valence electrons
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Question # 25
Generally a temperature scale is established by using certain physical properties of a material which varies
Choose an answer
nonlinearly with temperature
linearly with temperature
either of them
none of them
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Question # 26
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 # 27
In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is
Choose an answer
8
4
6
7
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Question # 28
The SI units of momentum is
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kg m s
-2
kg ms
kg m s
2
N-s
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Question # 29
The current produced by moving a loop of wire across a magnetic field is called
Choose an answer
Direct current
Magnetic current
Alternating current
Induced current
None of these
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Question # 30
The ratio of the r.m.s value of the applied voltage to the r.m.s value of resulting a.c. is
Choose an answer
Impedance
Inductance
Reactance
Resistance
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Question # 31
In an A.C circuit with resistor only, the current and voltage have a phase angle of
Choose an answer
90
°
0
°
180
°
none of these
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