1. The potential difference across a resistor is directly proportional to the: A. Resistance and current B. Resistance and power C. Current and power D. Current only
2. In a series RLC circuit, the impedance is maximum when: A. The inductive and capacitive reactances are equal and opposite B. The resistance is infinite C. The reactances are zero D. The circuit is at resonance
3. The total current in a parallel circuit is equal to: A. The sum of the individual currents B. The average of individual currents C. The smallest current D. The largest current
5. The potential difference across a conductor is directly proportional to the: A. Length of the conductor B. Cross-sectional area C. Current through the conductor D. Type of conductor
6. In an electromagnet, the magnetic field strength can be increased by? A. Increasing the current B. Increasing the number of turns in the coil C. Both of the above D. None of the above
7. The resistance of a wire is halved. If the voltage remains constant, what happens to the current? A. It doubles B. It becomes zero C. It halves D. It remains constant
8. The process of generating electric current using a changing magnetic field is called: A. Electromagnetic induction B. Thermoelectric effect C. Piezoelectric effect D. Electrolysis
9. Which of the following will increase the force between two magnetic poles? A. Increasing the distance between them B. Decreasing the distance between them C. Increasing the strength of one pole D. Decreasing the strength of one pole
10. The relationship between energy (E), power (P), and time (t) is: A. E = P × t B. E = P / t C. E = t / P D. E = P + t
11. A thermocouple works on the principle of A. Seebeck effect B. Joule effect C. Peltier effect D. Thermoelectric effect
12. A thermocouple's output is highest when there is A. A large temperature difference between the junctions B. The current is low C. The current is high D. The voltage across the junction is zero
13. The rate of change of flux is greater when: A. The magnetic field is stronger B. The coil has fewer turns C. The resistance of the coil is high D. The coil is made of a superconducting material
14. In an AC circuit, the impedance is minimum when: A. The circuit is in resonance B. The circuit has only resistance C. The circuit has only reactance D. The frequency is zero
15. Which of the following factors does NOT affect the heat produced by a current in a conductor? A. Current B. Time C. Voltage D. Material of conductor
16. The magnetic force on a current-carrying wire is maximum when the angle between the wire and the magnetic field is? A. 90 degrees B. 0 degrees C. 180 degrees D. 45 degrees
18. The induced current in a closed loop depends on: A. The time rate of change of magnetic flux B. The area of the loop C. The resistance of the coil D. All of the above
19. In an AC circuit with a resistor, the phase difference between voltage and current is: A. 90° B. 60° C. 0° D. 180°
20. In an AC circuit, the total current in a parallel combination of resistors is: A. The sum of the currents through each resistor B. The current through the resistor with the highest resistance C. The current through the resistor with the lowest resistance D. Equal to the voltage divided by the total resistance
21. The self-inductance of a solenoid increases with: A. Number of turns B. Area of cross-section C. Length of solenoid D. Current through the solenoid
22. Joule’s law of heating states that heat produced is proportional to A. Voltage B. Resistance and time C. Power and current D. The square of current
23. An ammeter is connected in which way to measure the current in a circuit? A. In series with the load B. Parallel with the load C. Across the terminals of the battery D. None of these
24. The average value of a sinusoidal current over a complete cycle is: A. Zero B. Maximum C. Half of the peak value D. RMS value
25. The voltage developed by a thermocouple is proportional to A. Temperature difference between junctions B. Current passing through the conductor C. Time duration D. Material of the conductor
26. For a sinusoidal AC supply, the RMS value of voltage is: A. Proportional to the average power B. Equal to the peak voltage C. Equal to the peak voltage divided by √2 D. Equal to the peak voltage multiplied by √2
27. The primary reason for a material’s high resistance in a heating element is A. Its atomic structure B. Its temperature C. Its length D. Its density
28. In an AC circuit, the power factor is the cosine of: A. The phase angle between voltage and current B. The current C. The voltage D. The reactance angle
29. In an AC circuit with pure inductance, the power factor is: A. Zero B. One C. Negative D. Infinite
30. The magnetic force on a particle moving perpendicular to the field is maximum when A. Speed is zero B. Speed is maximum C. Magnetic field strength is zero D. Speed is constant
31. The impedance of a capacitor in an AC circuit is: A. Inversely proportional to the frequency B. Directly proportional to the frequency C. Independent of frequency D. Inversely proportional to the square of the frequency
32. The magnetic flux linkage is defined as: A. The product of the magnetic field and the number of turns in a coil B. The number of turns in the coil C. The rate of change of magnetic flux D. The product of current and resistance
33. The total power consumed in a series circuit is the: A. Sum of the individual powers B. Product of the individual powers C. Difference of the individual powers D. Same as the voltage applied
34. The resonance condition in an AC circuit occurs when: A. The inductive reactance equals the capacitive reactance B. The inductive reactance is zero C. The capacitive reactance is zero D. The resistance is zero
35. The direction of the induced current in a coil depends on: A. The direction of the magnetic field B. The speed at which the magnetic field changes C. The number of turns in the coil D. The size of the coil
36. Which of the following instruments can be used to measure the small current accurately? A. Ammeter B. Voltmeter C. Galvanometer D. All of the above
38. When the current through a conductor is 0.5 A for 10 seconds, the charge passing through it is: A. 5 C B. 0.5 C C. 10 C D. 50 C
39. In a heating element, the resistance is chosen to be high to A. Increase the current B. Reduce the heat produced C. Increase the heat produced D. Increase the power consumption
40. In the Peltier effect, the temperature difference between two junctions is caused by A. Heating a conductor B. Cooling a conductor C. Passage of current through the junction D. None of the above
42. Which of the following is not affected by the heating effect of current? A. Conduction B. Induction C. Radiation D. Magnetization
43. Which type of meter is used to measure the current directly flowing through a conductor? A. Ammeter B. Voltmeter C. Galvanometer D. Wattmeter
44. How can the accuracy of an ammeter be increased? A. By increasing its internal resistance B. By using a moving coil mechanism C. By decreasing its internal resistance D. By using a moving iron mechanism
45. The deflection of a moving coil galvanometer is due to? A. Magnetic force on the coil B. Electric field acting on the coil C. Gravity acting on the coil D. None of these
46. In a transformer, the primary coil is connected to: A. AC supply B. DC supply C. Battery D. Electric motor
47. Magnetic field lines inside a hollow solenoid are A. Straight and parallel B. Radial and diverging C. Concentric and circular D. Elliptical
48. How does the Earth's magnetic field compare to that of a bar magnet? A. The Earth's magnetic field is similar to that of a bar magnet B. The Earth's magnetic field is weaker C. The Earth's magnetic field is opposite to that of a bar magnet D. The Earth's magnetic field does not resemble a bar magnet
49. The direction of magnetic force on a moving charge can be found using which rule? A. Right hand rule B. Left hand rule C. Coulomb’s law D. Lenz’s law
50. What is used to increase the range of an ammeter? A. Series resistance B. Shunt resistance C. Capacitor D. Inductor