# +2 Physics Current Electricity One Mark Questions

In this post, we provide a compiled collection of questions on HSC +2 Physics, focusing on Current Electricity chapter. These one mark questions are handpicked after careful study on the subject and we hope it will be helpful for those who are looking out to refresh their subject knowledge. If you know the answers to these questions, you can share it with us in the comments section of this blog.
1) A current of 0.5 A is drawn by a filament of an electric bulb for 5 minutes. The amount of charge that flows through the circuit is:

a) 2.5 C                    b) 0.2 C                    c) 10 C                    d) 150 C

2) An electric refrigerator rated 400W operates 8 hours/day. What is the cost of the energy to operate it for 30 days at Rs. 3.00 per unit?

a) Rs. 9.60                    b) Rs. 36.00                    c) Rs. 4.50                    d) Rs. 288.00

3) A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel.
If the equivalent resistance of this combination is $R^{'}$, then the ratio $R/R^{'}$ is:

a) 1/5                    b) 5                    c) 1/25                    d) 25

4) An electric bulb is rated 220V and 100W when it is operated on 110V, the power consumed will be:

a) 100W                    b)75W                    c) 50W                    d) 25W

5) For the given carbon resistor, let the first strip be Violet, second strip be Black, third strip be Brown and fourth be Silver.
The resistance of the resistor is:

a) $70 \pm 5 \%$       b) $70 \pm 10 \%$       c) $700 \pm 5 \%$      d) $700 \pm 10 \%$

6) A wire of resistance $5\Omega$ is drawn out so that its length is increased to twice its original length. Its new resistance is: 

a) $10\Omega$       b) $45\Omega$       c) $5\Omega$       d) $20\Omega$

7) A current of 5 A is passing through a metallic wire of cross-section area $4\times 10^{-6}m^{2}$.
If the density of charge carrier in the wire is $5\times 10^{26}m^{-3}$, the drift velocity of the electron is:

a) $\frac{1}{64}ms^{-1}$                                  b) $\frac{1}{6.4}ms^{-1}$

c) $\frac{1}{16}ms^{-1}$                                  b) $\frac{1}{1.6}ms^{-1}$

8) In a potentiometer arrangement a cell of emf 1.25V gives a balance point at 350 cm length of the wire.
If the cell is replaced by another cell, the balance point is at 700 cm. The emf of the second cell is:

a) 0.625 V             b) 2.50 V             c) 1.25 V             d) 0 V

9) In a meter bridge, the balancing length from the left end (standard resistance of $1\Omega$ in the right gap) is found to be 20 cm.
The value of the unknown resistance is :

a) $0.8\Omega$       b) $0.5\Omega$       c) $4\Omega$       d) $0.25\Omega$

10) A copper wire of length 2m and area of cross-section $4\times 10^{-6}m^{2}$ has a resistance of $2\Omega$.
The conductivity of copper is:

a) $4\times 10^{-6}\Omega m$                      b) $1\times 10^{-6}\Omega m$

c) $0.25\times 10^{6}mho-m^{-1}$                d) $1\times 10^{6}mho-m^{-1}$

11) The resistance of a conductor is $5\Omega$ at $50^{\circ}C$ and $6\Omega$ at $100^{\circ}C$.
Its resistance at $0^{\circ}C$ is:

a) $1\Omega$       b) $2\Omega$       c) $3\Omega$       d) $4\Omega$

12) A primary cell has an emf of 1.5V. When a $5\Omega$ resistor is connected across it, the current is 0.2A.
The internal resistance of the cell is:

a) $0.5\Omega$       b) $1.25\Omega$       c) $2.5\Omega$       d) $3\Omega$

13) The resistance of a wire of uniform diameter ‘d’ and length ‘l’ is R.
The resistance of another wire of the same material but diameter ‘2d’ and length ‘4l’ would be:

a) R/4                         b) R/2                         c) R                         d) 2R