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Free download in PDF Class 12 Physics Chapter 3 Current Electricity Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
A galvanometer acting as a volt meter will have with its coil.
[A]
a high resistance in parallel
[B]
a high resistance in series
[C]
a low resistance in parallel
[D]
a low resistance in series
Answer: a high resistance in series
(2)
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
[A]
resistance will be doubled and specific resistance will be halved
[B]
resistance will be halved and specific resistance will remain uncharged
[C]
resistance will be halved and the specific resistance will be doubled
[D]
resistance and specific resistance will both remain uncharged
Answer: resistance will be halved and specific resistance will remain uncharged
(3)
Ohm’s law is valid when the temperature of conductor is :
[A]
very low
[B]
very high
[C]
varying
[D]
constant
(4)
n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to
[A]
n²R
[B]
R/n²
[C]
R/n
[D]
nR
(5)
Emf is measured in :
[A]
joule
[B]
joule/coulomb
[C]
joule-coulombs
[D]
joule/coulomb/metre
(6)
A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :
[A]
20 A
[B]
5 A
[C]
0.2 A
[D]
None of these
(7)
The temperature coefficient of resistance is expressed in :
[A]
°C
[B]
°C-1
[C]
m°C-1
[D]
None of these
(8)
1 kilowatt hour is commonly known as :
[A]
unit
[B]
1 faraday
[C]
1 curie
[D]
None of these
(9)
In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :
[A]
4 Ω
[B]
2 Ω
[C]
1 Ω
[D]
1/2 Ω
(10)
The phenomenon of super-conductivity was discovered by :
[A]
Ohm
[B]
Onnes
[C]
Edison
[D]
None of these
(11)
Copper wire is used as connecting wire because :
[A]
copper has high electrical resistivity
[B]
copper has low electrical resistivity
[C]
copper has low electrical conductivity
[D]
copper has high value of elasticity
Answer: copper has low electrical resistivity
(12)
A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
[A]
2/3 Ω
[B]
3/2 Ω
[C]
1/2 Ω
[D]
1/3 Ω
(13)
The example of a non-ohmic resistance is:
[A]
copper wire
[B]
fi lament lamp
[C]
carbon resistor
[D]
diode
(14)
How many different resistances are possible with two equal resistors?
(15)
The speed at which tjie current travels in a conductor is nearly:
[A]
3 × 104 ms-1
[B]
3 × 106 ms-1
[C]
3 × 108 ms-1
[D]
3 × 1010 ms-1
(16)
The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :
[A]
resistor
[B]
super-conductor
[C]
thermocouple
[D]
thermistor
(17)
In following figure shows currents in a part of electrical circuit, then the value of/(in ampere) is given by :
[A]
0.3 A
[B]
0.5 A
[C]
1.3 A
[D]
None of these
(18)
An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed Will be:
[A]
500 W
[B]
750 W
[C]
1000 W
[D]
1125 W
(19)
A uniform w ire connected across a supply produces heat H per second. If wire is cut into three equal parts and all the parts are connected in parallel across the same supply, the heat produced per second will be :
[A]
H/9
[B]
9 H
[C]
3 H
[D]
H/3
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