StudyWithGenius 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. 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

Thank You

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