3. current electricity - CBSE STD 12 Science Physics Questions

1,699

Questions

1

Question groups

5

Question types

01

M.C.Q (1 Marks)

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Sample Questions

3. current electricity questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

A wire of length ' $r$ ' and resistance $100 \Omega$ is divided into $10$ equal parts. The first $5$ parts are connected in series while the next $5$ parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:

✓
$52 \Omega$
B
$55 \Omega$
C
$60 \Omega$
D
$26 \Omega$

Answer: A.

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Q 2M.C.Q (1 Marks)1 Mark

The terminal voltage of the battery, whose emf is $10 \mathrm{~V}$ and internal resistance $1 \Omega$, when connected through an external resistance of $4 \Omega$ as shown in the figure is:

A
$6 \mathrm{~V}$
✓
$8 \mathrm{~V}$
C
$10 \mathrm{~V}$
D
$4 \mathrm{~V}$

Answer: B.

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Q 3M.C.Q (1 Marks)1 Mark

Two heaters $A$ and $B$ have power rating of $1 \mathrm{~kW}$ and $2 \mathrm{~kW}$, respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:

✓
$2: 9$
B
$1: 2$
C
$2: 3$
D
$1: 1$

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark

The resistance of platinum wire at $0^{\circ}\,C$ is $2\,\Omega$ and $6.8\,\Omega$ at $80^{\circ} \,C$. The temperature coefficient of resistance of the wire is :