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ECAT Physics Chapter 12 Electrostatics Online Test MCQs With Answers
Question # 1
The relation between charge 'Q' and current 'I' is given by
Choose an answer
Q = I/t
Q = It
Q = I
2
t
Q = I
2
/t
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Question # 2
The minimum resistance that can be obtained by connecting 5 resistance of 1/4
Ω
each is
Choose an answer
4/5
Ω
5/4
Ω
20
Ω
0.05
Ω
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Question # 3
Two electric bulbs of 200 W and 100 W have same voltage. If R
1
and R
2
be their resistance respectively then
Choose an answer
R
1
= 2R
2
R
2
= 2R
1
R
2
=
4R
1
R
1
= 4R
2
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Question # 4
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 # 5
The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of
Choose an answer
power
current
resistance
temperature
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Question # 6
The conductivity of a superconductor is
Choose an answer
Infinite
Very large
Very small
Zero
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Question # 7
A current of 1.6 A is passed through a solution of CuSO
4. How many Cu
2+
ions are liberated in one minute?
Choose an answer
3 x 10
20
3 x 10
10
6 x 10
20
6 x 10
10
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Question # 8
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 # 9
The relation V = IR represents
Choose an answer
Ampere law
Faraday's law
Ohm's law
Len's law
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Question # 10
The SI unit of capacitance is
Choose an answer
Farad
Henry
Ohm
Volt
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Question # 11
The charge carriers in electrolyte are positive and negative
Choose an answer
protons
electrons
ions
none of these
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Question # 12
At any point on the right bisector of the line joining two equal and opposite charges
Choose an answer
At electric field is zero
The electric potential is zero
The electric potential decreases with increasing distance from the centre
The electric field is perpendicular to the line joining the charges
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Question # 13
Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is
Choose an answer
11.0 ohm
1.0 ohm
7.0 ohm
3.0 ohm
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Question # 14
If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be
Choose an answer
0.1 watt
1 watt
10 watt
100 watt
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Question # 15
The resistance of a conductor does not depend on its
Choose an answer
mass
resistivity
length
cross-sectional area
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Question # 16
A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when
Choose an answer
q = Q/4
q = Q/2
q = !
None of these
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