﻿ A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. The internal resistance of the cell is | Current Electricity

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# Current Electricity

#### Multiple Choice Questions

211.

The resistance of an incandescent lamp is

• smaller when switched on

• greater when switched off

• the same whether it is switch off or switch on

• greater when switched on

212.

An ammeter and a voltmeter are joined in series to a cell. Their readings are A and V respectively. If a resistance is now joined in parallel with the voltmeter, then

• A will decrease, V will increase

• A will increase, V will decrease

• both A and V will increase

• both A and V will decrease

213.

If each of the resistance of the network shown in figure is R, the equivalent resistance between A and B is

• 3R

• 5R

• $\frac{\mathrm{R}}{2}$

• R

# 214.A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. The internal resistance of the cell is1.2 Ω 2.0 Ω 0.5 Ω 1.0 Ω

C.

0.5 Ω

i1 = 0.9 amp

R1 = 2 Ω

E = i1 R1 + i1R                         ..... (i)

R2 = 7 Ω, i2 = 0.3 amp

E = i2 R2 + r i2

E = 0.3 × 7 + 0.3 r                    ...... (ii)

Eq. (i) is equal to eq.(ii)

215.

A and B are two conductors carrying a current I in the same direction. x and y are two electron beams moving in the same direction. Then there will be

• attraction between A and B, repulsion between x and y

• repulsion between A and B, attraction between x and y

• attraction between A and B and x and y

• repulsion between A and B and x and y

216.

The current-voltage graph for a given metallic conductor at two different temperature T1 and T2 are as shown in the figure. Then

• T1 < T2

• nothing can be said about T1 and T2

• T1 = T2

• T1 > T2

217.

The current-voltage graph for a given metallic conductor at two different temperature T1 and T2 are as shown in the figure. Then

• T1 < T2

• nothing can be said about T1 and T2

• T1 = T2

• T1 > T2