Free Printable current electricity class12

1.

SI unit of current

a)

$Cs^{-1}$

b)

$C^{-1}S$

c)

$CS$

d)

$C^2S^{-1}$

2.

Relation between electric current and mobility I=

a)

$enA\mu_eE$

b)

$\mu E$

c)

$neAV_d$

d)

$V_d\mu$

3.

SI UNIT OF MOBILITY

a)

$m^2V^{-1}S^{-1}$

b)

ohm

c)

$\Omega m$

d)

$m^2V^2S^{-1}$

4.

IN JUNCTION RULE,SUM OF CURRENTS AT ANY JUNCTION IS

a)

ZERO

b)

1

c)

V/R

d)

NONE

5.

Vector form of OHMS LAW

a)

V = IR

b)

$j^{\rightarrow}=\sigma E^{\rightarrow}$

c)

G=1/R

d)

NONE

6.

The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 Ω, what is the maximum currentthat can be drawn from the battery?

a)

20 A

b)

30A

c)

10A

d)

100A

7.

A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistanceof 2.7 Ω at 100 °C. Determine the temperature coefficient ofresistivity of silver.

a)

$0.00394\degree C^{-1}$

b)

$0.000394\degree C^{-1}$

c)

$1.00394\degree C^{-1}$

d)

$0.00994\degree C^{-1}$

8.

In a potentiometer arrangement, a cell of emf 1.25 V gives a balancepoint at 35.0 cm length of the wire. If the cell is replaced by anothercell and the balance point shifts to 63.0 cm, what is the emf of thesecond cell?

a)

$12.25V$

b)

$0.25V$

c)

$2.25V$

d)

0V

9.

Six lead-acid type of secondary cells each of emf 2.0 V and internalresistance 0.015 Ω are joined in series to provide a supply to aresistance of 8.5 Ω. What are the current drawn from the supply

a)

11.4A

b)

114A

c)

1.4A

d)

4A

10.

$\frac{R_1}{R_2}=\frac{R_3}{R_4}$ IS THE CONDITION OF BALANCED

a)

POTENTIOMETER

b)

WHEATSTONE BRIDGE

c)

OHMS LAW

d)

KIRCHOFFS RULE

current electricity class12

Total questions: 10

Worksheet time: 7mins

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