Download PDF
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)
In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
[A]
decrease resistance in the main circuit.
[B]
increase resistance in the main circuit.
[C]
decrease resistance in series with the cell whose emf is to be measured.
[D]
increase resistance in series with the cell whose emf is to be determined.
Answer: increase resistance in series with the cell whose emf is to be determined.
(2)
In parallel combination of n cells, we obtain
[A]
more voltage
[B]
more current
[C]
less voltage
[D]
less current
(3)
In the series combination of two or more than two resistances
[A]
the current through each resistance is same.
[B]
the voltage through each resistance is same.
[C]
neither current nor voltage through each re-sistance is same.
[D]
both current and voltage through each resis¬tance are same.
Answer: the current through each resistance is same.
(4)
A charge is moving across a junction, then
[A]
momentum will be conserved.
[B]
momentum will not be conserved.
[C]
at some places momenturii will be conserved and at some other places momentum will not be conserved.
[D]
none of these.
(5)
In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
[A]
change in previous direction
[B]
not change
[C]
change in opposite direction
[D]
none of these.
(6)
When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
[A]
shifts towards right
[B]
shifts towards left
[C]
remains unchanged
[D]
remains at zero
Answer: shifts towards right
(7)
An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be
[A]
equal to its steady current
[B]
slightly higher than its steady current
[C]
slightly less than its steady current
[D]
zero
Answer: slightly higher than its steady current
(8)
The I-V characteristics shown in figure represents
[A]
ohmic conductors
[B]
non-ohmic conductors
[C]
insulators
[D]
superconductors
Answer: non-ohmic conductors
(9)
AB is a wire of potentiometer with the increase in the value of resistance R, the shift in the balance point J will be
[A]
towards B
[B]
towards A
[C]
remains constant
[D]
first towards B then back towards A.
(10)
Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum
[A]
12.5 Q
[B]
13.5 Q
[C]
14.5 Q
[D]
16.5 Q
(11)
The resistivity of alloy manganin is
[A]
Nearly independent of temperature
[B]
Increases rapidly with increase in temperature
[C]
Decreases with increase in temperature
[D]
Increases rapidly with decrease in temperature
Answer: Nearly independent of temperature
(12)
If n cells each of emf e and internal resistance r are connected in parallel, then the total emf and internal resistance will be
(13)
A cell having an emf E and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by
(14)
Thermo electricity was discovered by:
[A]
Joule
[B]
Peitier
[C]
Thomson
[D]
Seebeck
(15)
When the wires are connected in parallel, the heat produced in the thinner wire is H1 and that in the thicker wire is H2 Then:
[A]
H1 = H2
[B]
H1 < H2
[C]
H1 > H2
[D]
H1 ≥ H2
(16)
A wire P is half the diameter and half the length of a wire Q of similar material. The ratio of resistances of P to that 0 is:
[A]
4 : 1
[B]
8 : 1
[C]
2 : 1
[D]
1 : 2
(17)
In a Wheatstone bridge, the resistance each arm is 10 Ω. If the resistance galvanometers is also 10 Ω, then effective resistance of the bridge will be :
[A]
40 Ω
[B]
20 Ω
[C]
10 Ω
[D]
5 Ω
(18)
Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance?
[A]
25 W
[B]
100 W
[C]
both bulbs have equal resistance
[D]
resistance of bulbs can not be compared
(19)
In India electricity is supplied fordomestic use at 220 V. It is supplied at 110 V in U.S.A. If the resistance of a 60 W bulb use in India is R. the resistance of a 60 W bulb for use in USA will be:
[A]
2 R
[B]
R
[C]
R/2
[D]
R/4
(20)
Which of the following has a negative temperature coefficient of resistance ?
[A]
Tungsten
[B]
Carbon
[C]
Nichrome
[D]
Platinum
Please share this page
Chapters