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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 is

1.2 Ω

2.0 Ω

0.5 Ω

1.0 Ω

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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 T_{1} and T_{2} are as shown in the figure. Then

T

_{1}< T_{2}nothing can be said about T

_{1}and T_{2}T

_{1}= T_{2}T

_{1}> T_{2}

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The current-voltage graph for a given metallic conductor at two different temperature T_{1} and T_{2} are as shown in the figure. Then

T

_{1}< T_{2}nothing can be said about T

_{1}and T_{2}T

_{1}= T_{2}T

_{1}> T_{2}

A.

T_{1} < T_{2}

R ∝ Temperature for conductor

$\therefore \frac{\mathrm{V}}{\mathrm{I}}=\mathrm{R}$

At T_{2}, R is greater than T_{1}

Hence, T_{1} < T_{2}

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