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Online Tests
ECAT Pre General Science Physics Chapter 12 Electrostatics Online Test MCQs With Answers
Question # 1
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 # 2
The energy stored in a charge capacitor
Choose an answer
1/2CV
2
1/2C
2
V
1/2C/V
2
None of these
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Question # 3
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 # 4
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 # 5
The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to
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Coulomb's law
Gauss's law
Biot-Sarwat law
Ampere's law
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Question # 6
Ohm is the unit of
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current
capacitance
energy
resistance
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Question # 7
If the distance of separation between two chares is increased, the electrical potential energy of the system will
Choose an answer
Increase
Decrease
May increase or decrease
Remain the same
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Question # 8
Current provided by a battery is maximum when
Choose an answer
Internal resistance equal to external resistance
Internal resistance is greater than external resistance
Internal resistance is less then external resistance
None of these
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Question # 9
In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes
Choose an answer
Four-fold
One-half
One-fourth
Zero
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Question # 10
A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is
Choose an answer
Two
1/2
Zero
3/2
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Question # 11
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 # 12
Coulomb force, when any material medium is placed between two charges
Choose an answer
Increases
Decreases
Remain unchanged
None of these
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Question # 13
When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will be
Choose an answer
180 watt
10 watt
20 watt
60 watt
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Question # 14
The substances whose resistance decreases with the increase in temperature these substances have coefficient of
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positive temperature
negative temperature
absolute temperature
zero temperature
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Question # 15
A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be
Choose an answer
64 W
80 W
100 W
125 W
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Question # 16
The thermistors are usually made of
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Metals with low temperature coefficient of resistivity
Metals with high temperature coefficient of resistivity
Metal oxides with high temperature coefficient of resistivity
Semi conducting materials having low temperature coefficient of resistivity
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Question # 17
Resistance of a conductor is increased, the currant will
Choose an answer
Decrease
Increase
Remain the same
None of these
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Question # 18
The SI unit of electric field intensity is
Choose an answer
CN
-1
NC
-1
or Vm
-1
JC
-1
AV
-1
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Question # 19
Electron volt is the unit of.
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Potential difference
Energy
Resistance
Capacitance
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Question # 20
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 # 21
Electric flux is defined by the relation
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E.A.
E x A
E/A
none of these
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Question # 22
Free electrons are
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tightly bound
fixed
loosely bound
tightly fixed
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Question # 23
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 # 24
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 # 25
Thermocouple is an arrangement of two different metals
Choose an answer
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 # 26
Potentiometer is more sensitive than voltmeter, because
Choose an answer
Voltmeter has a very high resistance
Voltmeter has a very low resistance
Potentiometer does not draw any current from a source of unknown potential difference
Potentiometer is sensitive
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Question # 27
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 # 28
A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is
Choose an answer
Charge Q
Potential V
Capacity
Energy U
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Question # 29
A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes
Choose an answer
2R
4R
16R
Zero
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Question # 30
A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?
Choose an answer
200 W
302.5
250 W
350 W
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