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ECAT Physics Chapter 12 Electrostatics Online Test MCQs With Answers
Question # 1
The dot product of electric field intensity E and vector area A is called
Choose an answer
Electric potential
Electric flux
Electric field
Magnetic field
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Question # 2
Heating effect caused by an electric circuit is written
Choose an answer
H = I
2
Rt
H = I
2
R
H = IR
2
t
H = IR
2
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Question # 3
In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10
-19
C. The number of excess electrons on the drop is
Choose an answer
3.9
4
4.2
6
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Question # 4
The SI unit of conductivity is
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ohm-m
ohm
-1
m
-1
ohm-m
-1
ohm
-1
m
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Question # 5
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 # 6
The conventional current in a circuit is defined as " current which passes from a point at higher potential to a point at lower potential as if it represent a movement of
Choose an answer
negative charges
positive charges
protons
electrons
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Question # 7
Resistance of a conductor depends upon
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the quantity of current passing through it
the voltage applied between its end
its dimensions, physical state and nature of its material
all of the above
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Question # 8
If the distance between the plates of a parallel plate condenser of capacity 10
μ
F is doubled then new capacity will be
Choose an answer
5
μ
F
20
μ
F
10
μ
F
15
μ
F
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Question # 9
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 # 10
Which of the following does not obey ohm's law?
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Copper
Al
Diode
None
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Question # 11
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 # 12
The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is
Choose an answer
21 x 10
3
+
10%
23 x 10
1
+
10%
21 x 10
3
+
5%
12 x 10
3
+
5%
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Question # 13
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 # 14
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 # 15
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 # 16
A conducting wire is drawn to double its length. Final resistivity of the material will be
Choose an answer
Double of the original one
Half of the original one
One fourth of the original one
Same as original one
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