Current Electricity MCQ Level - 1 | 10 Questions MCQ Test

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This mock test of Current Electricity MCQ Level - 1 for Physics helps you for every Physics entrance exam. This contains 10 Multiple Choice Questions for Physics Current Electricity MCQ Level - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Current Electricity MCQ Level - 1 quiz give you a good mix of easy questions and tough questions. Physics students definitely take this Current Electricity MCQ Level - 1 exercise for a better result in the exam. You can find other Current Electricity MCQ Level - 1 extra questions, long questions & short questions for Physics on EduRev as well by searching above.

QUESTION: 1

A wire is stretched to n times its length. Then the resistance now will increase by :

A.
n times
B.
1/n times
C.
1/n² times
D.
n² times

Solution:

M = constant

The correct answer is: n² times

QUESTION: 2

A cell has an emf 1.5 V when connected across in an external resistance of 2Ω the terminal potential difference falls to 1.0 V. The internal resistance of the cell is :

A.
1.52Ω
B.
0.5Ω
C.
1.0Ω
D.
2Ω

Solution:

Internal resistance of the cell is given by

The correct answer is: 1.0Ω

QUESTION: 3

n equal cell having e.m.f. E and internal resistance r, are connected in circuit of a resistance R. Same current flows in circuit either they connected in series or parallel, if :

A.
R = n²r
B.
R = nr
C.
R = r/n
D.
R = r

Solution:

Current when cells are connected in series

The correct answer is: R = r

QUESTION: 4

The potential difference between point A and B is :

A.
B.
0
C.
D.

Solution:

QUESTION: 5

A wire is bent in the form of a triangle now the equivalent resistance between its one end and the mid point of the side is :

A.
R/12
B.
5R/12
C.
3R/12
D.
7R/12

Solution:

Resistance R, R and R/2 are in series. Their resultant resistance.

Resistance R' and R/2 are in series. Their resultant resistance

QUESTION: 6

There is a voltmeter in a circuit. In order to triple its range, the resistance of how much value should be used?

A.
3R
B.
R/2
C.
2R
D.
4R

Solution:

If R is the resistance of the voltmeter and I current is flowing through it, then

The correct answer is: 2R

QUESTION: 7

Nine resistors each of resistance R are connected in the circuit as shown in figure. The net resistance between A and B is

A.
7R/6
B.
3R/5
C.
2R/9
D.
R

Solution:

The correct answer is: 2R/9

QUESTION: 8

The resistance of an ammeter is 13Ω and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of shunt resistance is :

A.
20Ω
B.
0.2Ω
C.
2Ω
D.
2kΩ

Solution:

The potential differences across ammeter and shunt is same. Let i_a is the current flowing through ammeter and i is the total current. So, a current i - i_a will flow through. shunt resistance.

The correct answer is: 2Ω

QUESTION: 9

The value of i₁/i₂ for a given diagram is :

Solution:

QUESTION: 10

When a wire of uniform cross-section a length ℓ and resistance R is bent into a complete circle, resistance between two of diametrically opposite points will be :