﻿ 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 | 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, thenA will decrease, V will increase A will increase, V will decrease both A and V will increase both A and V will decrease

B.

A will increase, V will decrease

When a resistance is joined in parallel with voltmeter

now V and S are, in parallel so it become an ammeter.

∴ A and A1 the two ammeters are in series reading will become equal.

∴ A increases and in parallel R decreases which decreases V.

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 is

• 1.2 Ω

• 2.0 Ω

• 0.5 Ω

• 1.0 Ω

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