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1. Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross-sectional area 5 mm² is v. If the electron density of copper is 9 × 10²⁸/m³, the value of v in mm/s is close to (Take charge of electron to be = 1.6 × 10⁻¹⁹ C)

A. 3 B. 0.2 C. 2 D. 0.02

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2. Two equal resistances when connected in series to a battery consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be

A. 240 W B. 120 W C. 60 W D. 30 W

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3. A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. The value of resistance is

A. 1.1 kΩ B. 2.2 kΩ C. 3.3 kΩ D. 4.4 kΩ

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4. A potentiometer wire of length 10 m and resistance 20 Ω is connected in series with a 3 V battery and a resistance of 40 Ω. The potential gradient along the wire is

A. 0.05 V/m B. 0.1 V/m C. 0.15 V/m D. 0.2 V/m

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5. 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

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6. 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

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7. 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

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8. 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

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9. 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

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10. 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

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11. 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

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12. 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

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13. 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

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14. 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

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15. 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

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16. 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

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17. 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

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18. 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

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19. 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

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20. 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