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Online Tests
ECAT Pre General Science Physics Chapter 12 Electrostatics Online Test MCQs With Answers
Question # 1
The electric intensity at infinite distance from the point charge will be
Choose an answer
Infinite
Positive
Zero
Negative
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Question # 2
Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
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3R
Ω
2R/4
Ω
R/3
Ω
2R/3
Ω
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Question # 3
The electric lines of force are
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Imaginary
Physically existing everywhere
Physically existing near the charge
All of the above
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Question # 4
If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy
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Ve
V/e
e/V
2Ve
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Question # 5
A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
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Charge Q
Potential V
Capacity
Energy U
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Question # 6
The capacity of a parallel plat capacitor depends on the
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Type to metal used
Thickness of plates
Potential applied across the plates
Separation between the plates
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Question # 7
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 # 8
When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to
Choose an answer
One joule
One erg
One electron volt
None of these
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Question # 9
The ohm's is defined as
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1 ampere / 1 volts
1 coulomb / 1 volt
1 volt / 1 ampere
1 volt / 1 coulomb
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Question # 10
Which one of the following is the unit of electric field intensity
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JC
-1
Vm
-1
Cm
-1
CJ
-1
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Question # 11
If the length of the conductor is double and its cross sectional area is halved, its conductance will
Choose an answer
Increase four fold
Become one-fourth
Become one-half
Remains unchanged
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Question # 12
The electric field will be uniform
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Near a positive point charge
Near a negative point charge
Between two oppositely charged parallel metal plates
None of above
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Question # 13
Resistor is a device which convert electric energy to
Choose an answer
Heat energy
Chemical energy
Elastic energy
All of the above
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Question # 14
An alpha particle is accelerated through a potential difference of 10
6
volt. Its kinetic energy will be
Choose an answer
1 MeV
2 MeV
4 MeV
8 MeV
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Question # 15
In bringing an electron towards another electron, electrostatic potential energy of system
Choose an answer
Decreases
Increases
Remains uncharged
Becomes zero
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Question # 16
The electric flux is linked with a surface will be maximum when
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The surface is held parallel to the electric field
The surface is held perpendicular to the electric field
The surface makes an angle of 45
° with the electric field
All of the above
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Question # 17
The SI unit of electric flux is
Choose an answer
Weber
Nm
2
C
-1
NmC
-1
Nm
-2
C
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Question # 18
The electric flux from a closed surface
Choose an answer
Is independent of the shape of the surface
Depends on the charge enclosed by the surface
Both a and b
None of the above
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Question # 19
The value of electrical constant of proportionality k is
Choose an answer
9 x 10
9
Nm
2
C
-2
9 x 10
-9
Nm
2
C
-2
9 x 10
10
Nm
2
C
2
9.85 x 10
-12
N
-1
C
-2
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Question # 20
The relation V = IR represents
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Ampere law
Faraday's law
Ohm's law
Len's law
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Question # 21
The potential difference across each resistance in series combination is
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same
different
zero
none of these
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Question # 22
A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is
Choose an answer
8 J
16 J
4 x 10
-3
J
2 x 10
-3
J
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Question # 23
The resistivity of a substance depends upon the
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length
mass
area
temperature
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Question # 24
The liquid which conduct current is known as
Choose an answer
heating effect
chemical energy
electrolyte
ohm's law
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Question # 25
The energy required to charge a capacitor of 5
μ
F by connecting D.C. source of 20 KV is
Choose an answer
10 KJ
5 KJ
2 KJ
1 KJ
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Question # 26
An electric charge at rest is
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Only an electric field
Only a magnetic field
Both electric and magnetic fields
None of the above
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Question # 27
The nature of capacity of electrostatic capacitor depends on
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Shape
Size
Thickness of plates
Area
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Question # 28
The fractional change in resistance per kelvin is known as
Choose an answer
temperature coefficient
resistance coefficient
super temperature
critical temperature
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Question # 29
Thermocouple is an arrangement of two different metals
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To convert heat energy in to electrical energy
To produce more heat
To convert heat energy into chemical energy
To convert electric energy in to heat energy
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Question # 30
Cause of heat production in a current carrying conductor is
Choose an answer
Collisions of free electrons with one another
High drift speed of free electrons
Collisions of free electrons with atoms or ions of conductor
High resistance value
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Question # 31
Electric generators which convert mechanical energy into
Choose an answer
solar energy
thermal energy
kinetic energy
electrical energy
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