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Physics ECAT Pre Engineering Online Test MCQs With Answers
Question # 1
A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?
Choose an answer
10 A
5 A
33.3 A
3.33 A
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Question # 2
Einstein's theory about gravity if better than Newton's because it gave explanation of:
Choose an answer
Inverse square law
Bending of light
Both A and B
None of above
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Question # 3
The nuclei of an element having the same charge number but different mass numbers are called:
Choose an answer
Isobars
Isotopes
Isomers
Isobaric
Isothermal
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Question # 4
If an amount of heat enters the system it could
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decrease the internal energy
not change the internal energy
increase the internal energy
none of them
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Question # 5
In the equation E=mc
2
value of c is?
Choose an answer
186000 miles per hour
186000 miles per sec
3 X 10
8
m/sec
Both A and C
Both B and C
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Question # 6
In SHM, there is always a constant ratio between displacement if body and its:
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Velocity
Period
Mass
Acceleration
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Question # 7
The number of countries who manage the largest satellite system is:
Choose an answer
3
24
126
200
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Question # 8
Three quarks make:
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An electron
A meson
A baryon
A photon
None of these
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Question # 9
Glass is an example of
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crystalline solid
amorphous solid
polymeric solid
none of them
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Question # 10
1 gm-cm
-3
is equal to:
Choose an answer
10
3
kg-m
-3
10
-3
kg-m
-3
1 kg-m
-3
10
6
kg-m
-1
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Question # 11
Resolving power in mth order diffraction for grating is given by:
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R = N/m
R = m/N
R = N x m
None of these
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Question # 12
The waves which propagate by the collision of material particles are known as
Choose an answer
e.m. waves
mechanical waves
light waves
microwaves
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Question # 13
The principle of superposition states that
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The total displacement due to several waves is the sum of the displacement due to those waves acting individually
Two stationary waves superimpose to give two progressive waves
A diffraction pattern consists of many interference patterns superimposed on one another
Two progressive waves superimpose to give a stationary wave
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Question # 14
The force acting on a charge moving in a magnetic field
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is perpendicular to the both magnetic field and direction of motion
is proportional to the magnetic of charges
vanishes when the motion is directly opposite to the direction of field
all of the above
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Question # 15
The diameter of an atom is of the order
Choose an answer
10
-125
m
10
-11
m
10
-10
m
10
-9
m
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Question # 16
The field around a moving charge is called
Choose an answer
magnetic field
conservative field
non-conservative field
none of these
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Question # 17
The fourth band is a:
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Silver band
Red band
Gold band
Either A or C
Either A or B
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Question # 18
Which of the following waves are more energetic
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radio waves
infrared waves
ultraviolet
γ-rays
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Question # 19
Gamma rays consist of steam of
Choose an answer
electron
proton
photons
all of these
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Question # 20
The range of particle depends upon the factor
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charge, mass and energy of particle
density of medium
ionization potential of the atoms
all the above
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Question # 21
In order to make a voltmeter, high resistance is connected with galvanometer, in
Choose an answer
perpendicular
may be paralled or pendicular
series
none of these
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Question # 22
In case of mechanical waves, we study the motion of
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a single particle
collection of particle
any one of them
none of them
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Question # 23
A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is:
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0.05 m
0.08 m
0.8 m
0.008 m
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Question # 24
For the virtual image, option _______ is not correct:
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1/p = 1/f -1/q
1/f = 1/p -1/q
1/p=1/p-1/f
1/p=1/f+1/q
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Question # 25
The time rate of change of displacement is called:
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Time
Acceleration
Speed
Velocity
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Question # 26
Alfa , beta and gamma rays are emitted from a radio-active substance
Choose an answer
spontaneously
when it is heated
when it is exposed to light
When it interacts with the other particle
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Question # 27
The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:
Choose an answer
Critical temparature
Temperature of vaporization
Melting point
Both (A) and (C)
Both (A) and (B)
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Question # 28
The peak voltage in a 220 volt A.C. supply is nearly
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220 volt
253 volt
.311 volt
440 volt
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Question # 29
Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as
Choose an answer
ON switch
off switch
function switch
none of these
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Question # 30
Ball pen functions on the principle of
Choose an answer
Viscosity
Boyle's law
Gravitational force
Surface tnesion
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Question # 31
The Space around the Earth within which it exerts a force of attraction on other bodies is known as
Choose an answer
Nuclear field
Conservative field
Electric field
Gravitational field
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