---

1. A wire of resistance 4 Ω is stretched to twice its original length. The resistance of the stretched wire would be

A. 4 Ω B. 8 Ω C. 16 Ω D. 32 Ω

---

2. In a meter bridge experiment, the null point is found at 40 cm from the left end. If a resistance of 10 Ω is connected in parallel with the unknown resistance, the null point shifts to 50 cm. The value of the unknown resistance is

A. 10 Ω B. 20 Ω C. 30 Ω D. 40 Ω

---

3. A cell of emf 2 V and internal resistance 1 Ω is connected to a 3 Ω resistor. The voltage across the cell is

A. 0.5 V B. 1 V C. 1.5 V D. 2 V

---

4. The temperature coefficient of resistance of a wire is 0.00125 per °C. At 300 K, its resistance is 1 Ω. The resistance of the wire at 500 K will be

A. 1.5 Ω B. 1.25 Ω C. 1.5 Ω D. 2 Ω

---

5. A 100 W, 200 V bulb and a 50 W, 200 V bulb are connected in series across a 200 V supply. The power consumed by the combination is

A. 33.3 W B. 50 W C. 66.7 W D. 100 W

---

6. A galvanometer has a resistance of 50 Ω and shows full-scale deflection for a current of 5 mA. To convert it into a voltmeter of range 0-10 V, the resistance to be connected in series is

A. 1.95 kΩ B. 1.95 Ω C. 2 kΩ D. 2.05 kΩ

---

7. A wire of resistance 10 Ω is bent in the form of a circle. The effective resistance between two diametrically opposite points will be

A. 10 Ω B. 5 Ω C. 2.5 Ω D. 20 Ω

---

8. In a potentiometer experiment, the balancing length is found to be 40 cm. On adding a resistance of 10 Ω in series with the cell, the balancing length becomes 50 cm. The internal resistance of the cell is

A. 5 Ω B. 10 Ω C. 15 Ω D. 20 Ω

---

9. A 10 m long wire of uniform cross-section and resistance 20 Ω is used as a potentiometer wire. A cell of emf 2 V and internal resistance 1 Ω is connected across the wire. The potential gradient along the wire is

A. 0.1 V/m B. 0.2 V/m C. 0.3 V/m D. 0.4 V/m

---

10. A 5 Ω resistor is connected in series with a parallel combination of two resistors of 10 Ω each. The equivalent resistance of the circuit is

A. 5 Ω B. 10 Ω C. 15 Ω D. 20 Ω

---

11. A cell of emf E and internal resistance r is connected to an external resistance R. The maximum current flows in the circuit when

A. R = r B. R > r C. R < r D. R = 0

---

12. A wire of resistance R is stretched to double its length. Its new resistance will be

A. R/2 B. R C. 2R D. 4R

---

13. A 60 W, 220 V bulb and a 100 W, 220 V bulb are connected in series to a 220 V supply. The power consumed by the combination is

A. 24 W B. 40 W C. 60 W D. 100 W

---

14. A potentiometer wire of length 1 m has a resistance of 10 Ω. It is connected in series with a resistance box and a 2 V battery. The potential gradient along the wire is 0.05 V/cm. The resistance unplugged in the box is

A. 30 Ω B. 40 Ω C. 50 Ω D. 60 Ω

---

15. A 2 V battery with internal resistance 0.1 Ω is connected across a load of 3.9 Ω. The voltage across the load is

A. 1.9 V B. 2 V C. 2.1 V D. 1.8 V

---

16. A 100 W, 220 V bulb is connected to a 110 V supply. The power consumed is

A. 25 W B. 50 W C. 75 W D. 100 W

---

17. A wire of resistance 12 Ω/m is bent to form a complete circle of radius 10 cm. The resistance between two diametrically opposite points is

A. 3 Ω B. 6 Ω C. 12 Ω D. 24 Ω

---

18. A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively, with and without being short-circuited through a resistance of 10 Ω. Its internal resistance is

A. 1 Ω B. 0.5 Ω C. 2 Ω D. 1.5 Ω

---

19. A steady current of 1.5 A flows through a copper voltameter for 10 minutes. If the electrochemical equivalent of copper is 30 × 10⁻⁵ g/C, the mass of copper deposited on the electrode will be

A. 0.50 g B. 0.67 g C. 0.27 g D. 0.40 g

---

20. A current of 3 A flows through a 2 Ω resistor shown in the circuit. The power dissipated in the 5 Ω resistor is

A. 4 W B. 2 W C. 1 W D. 5 W