Welcome to your Chapter 3 Current Electricity MCQs
1.
Two batteries of ε1 and ε2 (ε2 > ε1) and internal resistance r1 and r2 respectively are connected in parallel as shown in figure.
2.
A resistance R is to be measured using a meter bridge. Student chooses the standard resistance S to be 100 Ω He finds the null point at l1 = 2.9 cm. He is told to attempt to improve the accuracy. Which of the following is a useful way?
3.
Two cells of emf’s approximately 5 V and 10 V are to be accurately compared using a potentiometer of length 400 cm.
4.
In a meter bridge, the point D is a neutral point (figure).
5.
Which of the following is wrong? Resistivity of a conductor is
6.
Drift velocity vd varies with the intensity of electric field as per the relation
7.
For measurement of potential difference, a potentiometer is preferred over voltmeter because
8.
For a cell, the graph between the potential difference (V) across the terminals of the cell and the current (I) drawn from the cell is shown in the figure.
![Physics MCQs for Class 12 with Answers Chapter 3 Current Electricity 10](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
The e.m.f. and the internal resistance of the cell are
9.
A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is
10.
When there is an electric current through a conducting wire along its length, then an electric field must exist
11.
Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be
12.
From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance
13.
A charge is moving across a junction, then
14.
When a metal conductor connected to left gap of a meter bridge is heated, the balancing point
15.
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
16.
A charge is moving across a junction, then
17.
The effective resistance between C & D in given circuit is
18.
Constantan wire is used for making standard resistance, because it has
19.
AB is a wire of potentiometer with the increase in the value of resistance R, the shift in the balance point J will be
20.
Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum