Electrical resistance, V I characteristics of Ohmic and non Ohmic conductors, electrical energy and power - One Line Questions

1. What is the power consumed by a resistor of 20 Ohms connected to a 10V source? — 5 Watts
2. The unit 'Board of Trade Unit' (BTU) is equivalent to: — 1 Kilowatt-hour
3. A 100 Watt bulb is operated for 10 seconds. The energy consumed by the bulb is: — 1000 Joules
4. If the current through a resistor is doubled, the power dissipated will increase by a factor of: — 4
5. If the voltage across a resistor is doubled, the power dissipated will increase by a factor of: — 4
6. When a potential difference of 12V is applied across a resistor and a current of 3A flows, the resistance is: — 4 Ohms
7. If a 10 Ohm resistor has a current of 2A flowing through it, the power dissipated by the resistor is: — 40 Watts
8. A device draws 2A current when connected to a 12V battery. The power consumed by the device is: — 24 Watts
9. A 60W, 220V bulb is connected to a 220V supply. The current drawn by the bulb is: — 0.27 A
10. For an ohmic conductor, the V-I graph (potential difference vs. current) is: — A straight line passing through the origin
11. Which of the following is an example of a non-ohmic conductor? — A semiconductor diode
12. The V-I characteristic of a tungsten filament lamp at constant voltage is: — A curve bending towards the voltage axis
13. The V-I characteristic of a semiconductor diode is: — A curve that is non-linear
14. The SI unit of electrical resistance is: — Ohm
15. The electrical resistance of a conductor is proportional to its: — Length
16. Which of the following has a negative temperature coefficient of resistance? — Carbon
17. The V-I graph for an ohmic conductor has a constant: — Slope (representing resistance)
18. Which physical quantity is represented by the slope of the V-I graph for an ohmic conductor? — Resistance
19. What happens to the resistance of most metallic conductors when their temperature increases? — Increases
20. When the temperature of a conductor increases, its resistance: — Increases due to increased collisions of electrons with atoms
21. Resistivity (ρ) of a material is a property that: — Is independent of the dimensions of the conductor but depends on temperature and material
22. If a current I flows through a conductor with resistance R for time t, the electrical energy dissipated as heat is given by Joule's law of heating, which is: — All of the above
23. Which physical quantity is defined as the opposition to the flow of electric current through a conductor? — Electrical resistance
24. Electrical power is defined as the rate at which: — Electrical energy is supplied or dissipated
25. For a conductor obeying Ohm's law, if the applied voltage is increased by 50%, the current through it will: — Increase by 50%
26. The V-I characteristic of a semiconductor device shows that as voltage increases, resistance: — Decreases non-linearly
27. For a non-ohmic conductor, the V-I graph: — Is a curve or a straight line not passing through the origin
28. The V-I graph of a diode is non-linear because its resistance: — Varies with voltage and current
29. According to Ohm's Law, for a given conductor at a constant temperature, the potential difference across the conductor is directly proportional to: — The current flowing through it
30. The SI unit of electrical power is: — Watt
31. Electrical energy is the energy derived from: — The flow of electric charge
32. For a given material, the resistance of a wire is inversely proportional to its: — Area of cross-section
33. The resistance of a conductor depends on which of the following factors? — Length, area of cross-section, material, and temperature
34. A conductor that obeys Ohm's Law is called: — Ohmic conductor
35. The SI unit of resistivity is: — Ohm-meter
36. Which of the following is NOT a formula for electrical power (P)? — P = R / (V * I)
37. If a charge Q flows through a point in a circuit with a potential difference V across it, the electrical energy supplied or dissipated is: — V * Q
38. A heating element is made of nichrome. Its resistance is R. If the wire is stretched to double its length, its new resistance will be: — 4R
39. If a potential difference of V is applied across a conductor and a current I flows through it, its resistance R is given by: — R = V / I
40. The relationship between resistance (R), resistivity (ρ), length (L), and area of cross-section (A) of a conductor is given by: — R = ρ * L / A
41. The resistance of a wire of length L and uniform cross-sectional area A is R. If the length is increased to 2L and the area is reduced to A/2, the new resistance will be: — 4R
42. If a wire of resistance R is melted and recast into a wire of half its length, the new resistance will be: — R/4
43. Which of the following statements is INCORRECT regarding electrical resistance? — Resistance is independent of temperature.
44. The power dissipated in a resistor is maximum when: — The load resistance matches the source resistance (in specific contexts)
45. Which material has very low resistivity and is used for making connecting wires? — Copper
46. Which material has very high resistivity and is used for making heating elements? — Nichrome
47. A filament bulb's resistance increases as it heats up. This is because of: — The increasing atomic vibrations and collisions
48. The electrical energy consumed by a device is equal to the product of its power and: — Time for which it is used
49. Which of the following is a unit of electrical energy? — Joule
50. The SI unit of electrical energy is: — Joule
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