10th class physics unit 5 MCQs
chapter 5 MCQs 10th Class physics
Current Electricity:
1. An electric current in conductors is due to the flow of:
a. Positive charge
b. Positive ions
c. Free electrons
d. Negative ions
2. In an electric circuit, electrons move from higher potential to lower potential
a. Release energy
b. Gains power
c. Gains potential
d. Loss their identity
3. The SI unit of current is:
a. Coulomb
b. Volt
c. Watt
d. Ampere
4. Flow of charges is called:
a. Current
b. Volt
c. Ohm
d. Coulomb
5. One micro ampere is equal to:
a. 10-9 A
b. 10-3 A
c. 10-12 A
d. 10-6 A
6. Formula to find the quantity of current is:
a. Q = IR
b. l = t/q
c. V = IR
d. l = q/t
7. One milli ampere is equal to:
a. 10-6 A
b. 10-3 A
c. 10-9 A
d. 10-5 A
8. If 0.5C charge passes through a wire in 10s. Then what will be the amount of current?
a. 50mA
b. 20A
c. 5mA
d. 5A
9. Charges in motion constitute:
a. Potential difference
b. Electric current
c. e.m.f
d. Static electricity
10. Electric current is produced due to the flow of ………:
a. Negative charges
b. Positive charges
c. Both
d. Protons
11. How long does it take a current of 10 mA to deliver 30 C of charge?
a. 2 x 102 s
b. 3 x 102 s
c. 2 x 103 s
d. 3 x 103 s
12. The source of electric current is:
a. Motors
b. Battery
c. Charges
d. Sun
13. The instrument which is used to detect the presence of electric current in the circuit is called:
a. Galvanometer
b. Voltmeter
c. Ammeter
d. Digital meter
14. The resistance of an ideal galvanometer is:
a. Very large
b. Zero
c. Minimum
d. Very small
15. The range of the current measured by an ammeter is:
a. 1 A or 100 A
b. 1 A or 10 A
c. 0.1 A or 0.10 A
d. 1 A or 100 A
16. The terminal of the galvanometer with red colour shows the ………:
a. Neutral polarity
b. Positive polarity
c. Presence of electric current
d. Negative polarity
17. The terminal of the galvanometer with black colour shows the ………:
a. Neutral polarity
b. Positive polarity
c. Presence of electric current
d. Negative polarity
18. Galvanometer is connected in circuit in:
a. At one end
b. Parallel
c. At both ends
d. Series
19. Ammeter is connected in circuit in:
a. At one end
b. Parallel
c. At both ends
d. Series
20. The energy stored in battery is:
a. Electrical
b. Chemical
c. Solar
d. Mechanical
21. What is the voltage across a 6 Ohm resistor when 3A of current passes through it?
a. 18V
b. 2V
c. 36V
d. 9V
22. When we double the voltage in a simple electric circuit, we double the
a. Resistance
b. Current
c. Both (a) and (b)
d. Power
23. The SI unit of potential difference is:
a. Volt
b. Joule
c. Coulomb
d. Newton
24. Electric potential and e. m. f are:
a. Have different units
b. Are the same terms
c. Both (b) and (c)
d. Are the different terms
25. The formula for emf is:
a. E = Q/I
b. E = W/Q
c. E = J/Q
d. E = W/I
26. The resistance of an ideal voltmeter is:
a. Very high
b. Less
c. Zero
d. Very less
27. SI unit of emf is:
a. CJ
b. NC-1
c. JC
d. NC-1
28. The voltmeter is used to measure:
a. Electric charge
b. Electric current
c. Resistance
d. Potential difference
29. The SI unit of emf is JC which is equal to:
a. Joule
b. Volt
c. Ampere
d. Coulomb
30. The potential difference across a circuit is measured by:
a. Voltmeter
b. Galvanometer
c. Ammeter
d. All
31. A digital multimeter is used to measure:
a. Resistance
b. Electric current
c. Potential difference
d. All
32. The voltmeter is always connected in circuit in:
a. In the middle
b. Parallel
c. At one end
d. Series
33. The form of non-electrical energy is:
a. Thermal energy
b. Mechanical energy
c. Chemical energy
d. All
34. The first electric battery voltaic pile was developed by:
a. Simon Ohm
b. Alessandro volta
c. Faraday
d. Charles coulomb
35. The emf in a circuit is measured by:
a. Voltmeter
b. Galvanometer
c. Ammeter
d. All
36. The equation of Ohm’s law is:
a. I = 2VR
b. V = I/R
c. V = IR
d. V = R/I
37. SI unit of resistance is:
a. Coulomb
b. Volt
c. Ohm
d. Ampere
38. If 3 Ampere current passes through a resistor of 6 Ohm. Then the voltage at its ends will be:
a. 18V
b. 2V
c. 36V
d. 9V
39. If we increase both current and voltage in a circuit keeping the resistance constant then power will be:
a. Becomes double
b. Remains unchanged
c. Becomes four times
d. Becomes half
40. In Ohm’s law, the constant used is:
a. I
b. V
c. Q
d. R
41. Ohm is represented by:
a. Ω
b. Σ
c. α
d. ρ
42. According to Ohm’s law, the graph between current I and potential difference V is:
a. A line parallel to x axis
b. A curve
c. A line parallel to y axis
d. A straight line
43. The materials which obey Ohm’s law are called:
a. Non Ohmic materials
b. Insulators
c. Metalloids
d. Ohmic materials
44. The materials which do not obey Ohm’s law are called:
a. Non Ohmic materials
b. Conductors
c. Metalloids
d. Ohmic materials
45. The resistance of 10 Wm copper is:
a. 2.75
b. 5.25
c. 1.69
d. 1.62
46. The specific resistance of copper is:
a. 1.50
b. 1.99
c. 1.20
d. 1.69
47. The specific resistance of nichrome is:
a. 300 x 10-8 Wm
b. 100 x 10-8 Wm
c. 600 x 10-8 Wm
d. 200 x 10-8 Wm
48. The factors affecting resistance are:
a. Four
b. Two
c. Five
d. Three
49. The resistance of the wire is directly proportional to the:
a. Cross sectional area
b. Length
c. Time taken
d. Area
50. The resistance of the wire is inversely proportional to the:
a. Cross sectional area
b. Length
c. Time taken
d. Volume
51. The formula of specific resistance for any conductor is:
a. R = L ρ/A
b. R = ρ A/L
c. R = L A/ρ
d. R = ρ L/A
52. The symbol used to represent specific resistance is:
a. ρ
b. Ω
c. L
d. Ωm
53. The value of specific resistance depends upon:
a. Length
b. Temperature
c. Nature of the conductor
d. Pressure
54. SI unit of ρ is:
a. m/Ω
b. Ωm
c. NC-1
d. Ω/m
55. Flow of electric current in conductors is mainly due to:
a. Positive charges
b. Positive ions
c. Free electrons
d. Negative ions
56. The good conductors offer ……… to flow of current:
a. Zero resistance
b. High resistance
c. Less resistance
d. All
57. The resistance of conductors increases with the increase in:
a. Volume
b. Surface area
c. Pressure
d. Temperature
58. The materials which allow the electric current to pass are:
a. Semiconductors
b. Insulators
c. Smooth surfaces
d. Conductors
59. The materials which do not allow the electric current to pass are:
a. Semiconductors
b. Insulators
c. Smooth surfaces
d. Conductors
60. The insulators offer ……… to flow of current:
a. Zero resistance
b. High resistance
c. Less resistance
d. All
61. Example of insulator is:
a. Wood
b. Rubber
c. Glass
d. All
62. What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added?
a. Remains the same
b. Increases
c. Cannot be predicted
d. Decreases
63. The combined resistance of two identical resistors, connected in series is 8Ω . Their combined resistance in a parallel arrangement will be:
a. 8Ω
b. 2Ω
c. 12Ω
d. 4Ω
64. When resistance is connected in series, the current flowing through it is:
a. Equal
b. Different
c. Zero
d. None of the above
65. Two resistors of 6kW and 4kW are connected to a battery of 10V in series, its equivalent resistance will be:
a. 12/5 kΩ
b. 10kΩ
c. 5/12 kΩ
d. 2kΩ
66. The methods of combinations of resistors are:
a. Four
b. Two
c. Five
d. Three
67. In series combination, which of the following quantity remains same?
a. Resistance
b. Current
c. Voltage
d. All
68. In parallel combination, which of the following quantity remains same?
a. Resistance
b. Current
c. Voltage
d. All
69. Mathematically Joule’s law is:
a. W = I2RT
b. W = I2R
c. W=2IRT
d. W=2RT
70. If we double both current and the voltage in a circuit while keeping its resistance constant, the power
a. Doubles
b. Remains unchanged
c. Doubles
d. Halves
71. What is the power rating of a lamp connected to 12V source when it carries 2.5A?
a. 30W
b. 4.8W
c. 60W
d. 14.5W
72. SI unit of electric power is:
a. Volt
b. Watt
c. Ampere
d. Joule
73. The electric power of washing machine is:
a. 100
b. 800
c. 50
d. 750
74. 1KWh is equal to:
a. 3.6MJ
b. 1.6MJ
c. 4.6MJ
d. 2.6MJ
75. One kilowatt hour is equal to:
a. 3.6 x 109 J
b. 1.6 x 103 J
c. 3.6 x 1012 J
d. 3.6 x 106 J
76. One watt is equal to:
a. J
b. Js
c. s
d. Js-1
77. Electric power is equal to:
a. I2R
b. I2V
c. IR2
d. IV2
78. The current derived from a cell or a battery is:
a. Induced current
b. Direct current
c. emf
d. Alternating current
79. The wire carrying no current is called:
a. Live wire
b. Earth wire
c. Neutral wire
d. All
80. The wire maintained at zero potential is called:
a. Live wire
b. Earth wire
c. Neutral wire
d. All
81. The wire which is at high potential is called:
a. Live wire
b. Earth wire
c. Neutral wire
d. All
82. It does not allow DC current to pass but allows AC current to pass:
a. Specific resistance
b. Capacitor
c. Thermometer
d. Resistance
83. The potential of neutral wire is:
a. Zero volt
b. one volt
c. Ten volt
d. Five volts
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