Free Printable Chapter 15 Direct Current Circuits

1.

A circuit is set up as shown in the diagram. The e.m.f. of the battery is 1.5 V and the resistance R is 2.0 $\Omega$ . Which statement below is not true about the circuit?

a)

When switch S is opened, the voltmeter reads 1.5 V.

b)

When switch S is closed, the voltmeter reads less than 1.5 V.

c)

When switch S is closed, the ammeter reads 0.75 A.

d)

When switch S is opened, the ammeter reads zero.

2.

In a circuit, the current flow is 1.0 A. If the potential difference across the resistor is 1.0 V and the e.m.f. of the cell is 1.5 V, what is the internal resistance of the cell?

a)

0.2 $\Omega$

b)

0.5 $\Omega$

c)

1.2 $\Omega$

d)

1.5 $\Omega$

3.

The cells in the above circuits have internal resistance 1.0 $\Omega$ and all the bulbs are identical. Which circuit has the highest ammeter reading?

a)

A

b)

B

c)

C

d)

D

4.

Three identical cells each of e.m.f. 1.5 V and internal resistance 0.5 $\Omega$ are connected to a resistor of resistance 6 $\Omega$ as shown in the diagram. Which statement below is not true about the circuit?

a)

The voltmeter reads a value less than the total e.m.f. of the cells.

b)

The voltmeter reads the potential difference across the 6 $\Omega$ resistor.

c)

The effective e.m.f. of the cells is equal to the e.m.f. of one cell.

d)

The power dissipated in overcoming the internal resistance of the three cells is 0.24 W.

5.

One part of a circuit is as shown in the diagram. If the current flowing in the circuit is 2 mA and the potential at point P is 12 V, find the potential at point R.

a)

0 V

b)

2 V

c)

4 V

d)

8 V

6.

a)

A

b)

B

c)

C

d)

D

7.

An electric circuit is as shown in the diagram. If cell P and cell Q have e.m.f. 3 V and 4 V with internal resistance 1 $\Omega$ and 2 $\Omega$ respectively, calculate the current flowing in the circuit.

a)

0.20 A

b)

0.50 A

c)

1.0 A

d)

1.2 A

8.

a)

A

b)

B

c)

C

d)

D

9.

a)

1000 $\Omega$

b)

2000 $\Omega$

c)

3000 $\Omega$

d)

5000 $\Omega$

10.

a)

4.0 V

b)

5.0 V

c)

8.0 V

d)

10 V

11.

A potentiometer circuit is set up as shown in the diagram. The galvanometer reading is zero when the sliding contact is at point J, distance $l_1$ from X and distance $l_2$ from Y. If $E_1$ and $E_2$ are the e.m.f. of the cells with negligible internal resistance, which expression shows the value of $E_2$ ?

a)

$\left(\frac{l_2}{l_1+l_2}\right)E_1$

b)

$\left(\frac{l_1}{l_1+l_2}\right)E_1$

c)

$\left(\frac{l_1+l_2}{l_2}\right)E_1$

d)

$\left(\frac{l_1+l_2}{l_1}\right)E_1$

12.

a)

A

b)

B

c)

C

d)

D

13.

The lengths of the wire P and Q are 4.0 cm and 12.0 cm respectively. If the resistivity of wire P is 1.1 $\times10^{-6}\Omega$ m and the diameters of the two wires are the same, what is the resistivity of wire Q when the galvanometer shows null deflection?

a)

3.7 $\times10^{-7}\Omega\ m$

b)

4.0 $\times10^{-7}\Omega\ m$

c)

4.3 $\times10^{-7}\Omega\ m$

d)

4.7 $\times10^{-7}\Omega\ m$

14.

The wire XY is 1.0 m long and resistance 6.0 $\Omega$ . If the resistance R is 2.0 $\Omega,$ what is the balanced length, $l$ when the galvanometer shows null deflection?

a)

65 cm

b)

70 cm

c)

77 cm

d)

80 cm

Chapter 15 Direct Current Circuits

Total questions: 14

Worksheet time: 27mins

Similar Resources on Wayground