VARDAAN LEARNING INSTITUTE

1. The SI unit of electric charge is: (a) Volt (b) Ampere (c) Coulomb (d) Ohm
2. Rate of flow of electric charge is called: (a) Potential (b) Current (c) Resistance (d) Power
3. Instrument used to measure electric current is: (a) Ammeter (b) Voltmeter (c) Galvanometer (d) Potentiometer
4. Work done to move a unit charge from one point to another is: (a) Current (b) Potential Differene (c) Power (d) Resistance
5. The unit of Potential Difference is: (a) Watt (b) Joule (c) Volt (d) Ampere
6. Ohm’s law states the relationship between: (a) V and I (b) P and V (c) J and C (d) V and W
7. Resistance of a conductor depends on: (a) Length (b) Area (c) Material (d) All of these
8. Resistivity depends on: (a) Length (b) Area (c) Material & Temperature (d) Shape
9. SI unit of Resistance is: (a) Ohm-meter (b) Ohm (c) Mho (d) Siemens
10. SI unit of Resistivity is: (a) Ohm (b) Ohm-meter (c) Ohm/meter (d) Ampere
11. When resistors are connected in series, the quantity that remains same is: (a) Voltage (b) Current (c) Power (d) Heat
12. When resistors are connected in parallel, the quantity that remains same is: (a) Voltage (b) Current (c) Resistance (d) Energy
13. Commercial unit of electrical energy is: (a) Joule (b) Watt (c) kWh (d) Volt
14. 1 kWh is equal to: (a) $3.6 \times 10^5$ J (b) $3.6 \times 10^6$ J (c) $3.6 \times 10^3$ J (d) $3.6 \times 10^9$ J
15. The filament of an electric bulb is made of: (a) Copper (b) Aluminum (c) Tungsten (d) Nichrome
16. Heating element of electric iron is made of: (a) Copper (b) Nichrome (c) Tungsten (d) Iron
17. Electric power is given by: (a) $P = V/I$ (b) $P = I/V$ (c) $P = VI$ (d) $P = V^2 I$
18. Joule’s law of heating is: (a) $H = I^2 Rt$ (b) $H = V^2 Rt$ (c) $H = V It^2$ (d) $H = IR^2 t$
19. Fuse wire is made of an alloy of: (a) Copper and Tin (b) Lead and Tin (c) Aluminum and Copper (d) Silver and Lead
20. A device that reverses the direction of flow of current in a circuit is called: (a) Resistor (b) Commutator (c) Rheostat (d) Ammeter

21. Electric current is a ______ quantity.
22. Ammeter is always connected in ______ in a circuit.
23. Voltmeter is always connected in ______ in a circuit.
24. The resistance of an ideal ammeter is ______.
25. The resistance of an ideal voltmeter is ______.
26. Conductance is the reciprocal of ______.
27. The value of charge on one electron is ______ C.
28. Resistivity of a wire ______ with increase in temperature. (For metals)
29. In parallel combination, the equivalent resistance is ______ than the smallest individual resistance.
30. In series combination, the equivalent resistance is ______ than the largest individual resistance.
31. The melting point of a fuse wire should be ______.
32. Function of electric fuse is based on the ______ effect of current.
33. Tungsten is used in bulbs because of its ______ and high melting point.
34. Resistivity of alloys is generally ______ than their constituent metals.
35. The direction of conventional current is ______ to the flow of electrons.
36. 1 Volt = 1 ______ per Coulomb.
37. 1 Watt = 1 Volt x 1 ______.
38. Kilowatt-hour is the unit of ______.
39. Variable resistance is also known as ______.
40. A continuous and closed path of an electric current is called an ______.

41. Current is a vector quantity.
42. Work done is a scalar quantity.
43. Volt is the unit of charge.
44. Resistivity depends on the length of the wire.
45. Resistance depends on the area of cross-section.
46. Current flows from lower potential to higher potential.
47. An ammeter has high resistance.
48. A voltmeter has high resistance.
49. Power ratings of appliances are usually expressed in Watts.
50. 1 Horsepower (HP) is equal to 746 Watts.
51. Nichrome does not oxidize easily at high temperatures.
52. Silver is the best conductor of electricity.
53. Rubber and glass are good conductors.
54. The net charge on a neutral atom is zero.
55. Number of electrons in 1 Coulomb of charge is $6.25 \times 10^{18}$.
56. Resistance of a semiconductor decreases with temperature rise.
57. In house wiring, appliances are connected in series.
58. Earth wire is used for safety purposes.
59. The graph between V and I for an ohmic conductor is a curved line.
60. Ohm's law is applicable to diodes and transistors.

Set 1: Physical Quantities & Units

Set 2: Formulas

Set 3: Devices & Properties

Set 4: Materials

81. What is the charge of a proton?
82. Name a metal which is the best conductor of electricity.
83. Which alloy is used for making standard resistors (coils)?
84. What happens to resistance if length is doubled?
85. What happens to resistance if area is doubled?
86. How many terminals does a cell have?
87. Which effect of current is used in an electric bulb?
88. Which effect of current is used in an electric bell?
89. Write the relation between power, voltage and current.
90. Write the relation between Energy, Power and Time.
91. Does voltage drop in parallel connection?
92. Does current split in series connection?
93. What is the frequency of DC current?
94. What is the frequency of AC supply in India?
95. Who discovered the relationship between current and potential difference?
96. Name the instrument used to detect the presence of current (not measure magnitude specifically).
97. Which wire goes to the switch: Live or Neutral?
98. What is the color of the live wire in new convention?
99. What is the color of the earth wire?
100. What is the commercial unit equivalent to 1 unit of electricity bill?