To the visitors of blog

I have created this blog for students of class 10 of Gujarat secondary Education Board (GSEB). Questions are based on the text book of Gujarat Board. Hope it will help other students, too. For descriptive Question-Answer you can visit my another blog scienceandtechnology-manojsir.blogspot.com

Tuesday, January 7, 2014

Chapter 4 : ELECTRICITY

Choose Appropriate Alternative



  1. The SI unit of electric charge is...
    [A] ampere [B] volt [C] watt [D] coulomb
  2. How many electrons will be there in 1.6 C charge?
    [A] 1017 [B] 1018 [C] 1019 [D] 1020
  3. 1 μA = ______ mA.
    [A] 10-16[B] 10-3 [C] 103 [D] 106
  4. Which of the following materials has more number of free electrons?
    [A] Copper [B] Glass [C] Rubber [D] Iron
  5. According to Ohm's law...
    [A] The resistance increases with the increase in current. 
    [B] The resistance increases with the increase in voltage.
    [C] The current increases with the increase in voltage. 
    [D] The resistance and current both increase with the increase in voltage.
  6. The formula for electric current is...
    [A] I = Q.t [B] I = Q/t [C] I = t/Q [D] I = W.t
  7. 2 A current is passed through a conducting wire for 1 min. How much charge will flow through the wire?
    [A] 2 C [B] 30 C [C] 60 C [D] 120 C
  8. In an electrical appliance, current of 4.8 A is passed. The number of electrons passing through it in 1 sec will be...
    [A] 0.33 x 1019 [B] 3.3 x 1019 [C] 3 x 1019 [D] 4.8 x 1019
  9. Which of the following formulas represents voltage?
    [A] Work/(current.time)      [B] Work.time/current 
    [C] (Work).(electric charge) [D] (Work).(electric charge).(time)
  10. The unit of electrical potential difference is...
    [A] J [B] J/C [C] J.C [D] C/J
  11. If the work done to move 3 C electric charge from one point to another point is 15 J, what will be the potential difference between these points?
    [A] 3 V [B] 15 V [C] 5 V [D] 45 V
  12. The resistance of a conducting wire is 10 Ω. How much electric current will flow by connecting it with a battery of 1.5 V?
    [A] 0.15 mA [B] 1.5 mA [C] 15 mA [D] 150 mA
  13. On which factors does the resistivity of a conducting wire depend?
    [A] Length of wire [B] Cross-sectional area of wire 
    [C] Volume of wire [D] Material of wire
  14. If 5 equal pieces are made from a wire having resistance 5 Ω and then each piece is connected in parallel to others, then their equivalent resistance will be...
    [A] 1/5 Ω [B] 1 Ω [C] 5 Ω [D] 25Ω 
  15. The unit of resistivity is...
    [A] Ω [B] Ω.m [C] Ω/m [D] m/Ω
  16. What will be the equivalent resistance between points A and B of the following circuit?

    [A] 1 Ω [B] 2 Ω [C] 5 Ω [D] 10 Ω
  17. What will be the equivalent resistance between points A and B of the following circuit?

    [A] 4 Ω [B] 8 Ω [C] 2 Ω [D] ⒠
  18. What will be the equivalent resistance between points A and B of the following circuit?

    [A] 2.5 Ω [B] 5 Ω [C] 12.5 Ω [D] 20 Ω
  19. Which physical quantity has the unit kWh?
    [A] Work [B] Electric power [C] Electric current [D] Electric potential
  20. 1 kWh = _____ joule.
    [A] 3.6 x 106 [B] 3.6 x 103 [C] 3.6 x 10-6 [D] 3.6 x 10-3
  21. An electric heater consumes 1.1 kW power when 220V voltage is applied to it. How much current will flow through it?
    [A] 1.1 A [B] 2.2 A [C] 4 A [D] 5 A
  22. What makes electric current flow through a solution?
    [A] Only free electrons [B] Only positive ions 
    [C] Only negative ions [D] Positive and negative ions
  23. The distilled water acts as _____ for the electricity.
    [A] conductor [B] insulator [C] semiconductor [D] none
  24. The magnitude of electric force between the charges can be calculated using the law devised by...
    [A] Coulomb [B] Ohm [C] Maxwell [D] Ampere
  25. Free electrons are...
    [A] in the first orbit [B] in any orbit 
    [C] valence electrons [D] on the surface of the conductor
  26. _____ discovered electrons.
    [A] Ampere [B] Faraday [C] Thomson [D] Coulomb
  27. 1 mA = _____ A.
    [A] 10 [B] 10-1[C] 10-2[D] 10-3
  28. In Volta's cell...
    [A] electrical energy is converted to thermal energy.
    [B] thermal energy is converted to electrical energy.
    [C] chemical energy is converted to electrical energy.
    [D] electrical energy is converted to chemical energy.
  29. In Volta's cell _____ plate acts as cathode.
    [A] copper [B] graphite [C] zinc [D] aluminium
  30. The SI unit of resistance is...
    [A] coulomb/sec [B] volt/ampere [C] ampere/volt [D] volt/joule
  31. Which of the following has maximum resistivity?
    [A] Tungsten [B] Nichrome [C] Aluminium [D] Diamond
  32. Which of the following is a semiconductor?
    [A] Germanium [B] Diamond [C] Graphite [D] Nichrome
  33. The chemical equivalent of an atom is the ratio of...
    [A] atomic mass to atomic radius [B] atomic radius to atomic mass 
    [C] atomic mass to valency      [D] valency to atomic mass
  34. Work done on an electric charge is stored in it as...
    [A] potential energy [B] kinetic energy [C] thermal energy [D] nuclear energy
  35. _____ is not essential to obtain electric current.
    [A] Free electrons [B] Potential difference [C] Electric circuit [D] Potential
  36. Who invented the simple electrochemical cell?
    [A] Faraday [B] Edison [C] Volta [D] Coulomb
  37. When resistors are connected in series...
    [A] voltage drop is uniform               [B] current is uniform 
    [C] voltage drop and current are uniform [D] neither of the two is uniform
  38. When resistors are connected in parallel...
    [A] voltage drop is uniform               [B] current is uniform 
    [C] voltage drop and current are uniform [D] neither of the two is uniform
  39. The equivalent resistance of three resistors of 6Ω, 12Ω and 12Ω connected in parallel is...
    [A] 6Ω [B] 12Ω [C] 3Ω [D] 1/3Ω
  40. Which of the following is not correct for electric work(W)?
    [A] W = V.Q [B] W = V.I.t [C] W = I2Rt [D] W = I2RQ
  41. _____ is not a unit of energy.
    [A] joule [B] watt [C] watt.second [D] kWh
  42. 1 joule = ______.
    [A] 1 watt.second [B] 1 watt/sec [C] 1 coulomb/sec [D] 1 unit
  43. Which of the following is not correct?
    [A] P = W/t [B] P = I2R [C] P = W.I [D] P = V.I
  44. Silicon is a/an...
    [A] conductor [B] insulator [C] semiconductor [D] superconductor
  45. The equivalent resistance of the resistances connected in parallel is...
    [A] smaller than the smallest resistance [B] larger than the largest resistance
    [C] an average of all resistances       [D] algebraic sum of all resistances
  46. 1 unit of domestic electrical energy is...
    [A] 1 joule [B] 1 watt.sec [C] 3.6 x 106 joule [D] 3.6 x 106kWh
  47. Three resistances of equal magnitude are connected in parallel. The circuit current is 3 A. Then the current passing through each resistor is...
    [A] 3 A [B] 1 A [C] 9 A [D] 1/3 A
  48. How much total electric charge is present on 100 protons?
    [A] 6 x 10-19C [B] 6 x 10-17C [C] 1.6 x 10-19C [D] 1.6 x 10-17C
  49. Which of the following is a good conductor of electricity?
    [A] Rubber [B] Glass [C] Plastic [D] Graphite
  50. Which of the following is a bad conductor (insulator) of electricity?
    [A] Copper [B] Graphite [C] Glass [D] Silver
  51. Which of the following statements is true for electric current?
    [A] The direction of conventional current and that of electrons is opposite.
    [B] The direction of conventional current and that of electrons is same. 
    [C] The direction of conventional current is random.
    [D] Electron flow is random.
  52. 1 μA = ______ mA
    [A] 10-1 [B] 10-2 [C] 10-3 [D] 103
  53. 1 mA = _____ μA
    [A] 10-1 [B] 10-3[C] 103 [D] 106
  54. How many electrons will carry 4.8 x 10-16 C charge?
    [A] 300 [B] 3000 [C] 480 [D] 4800
  55. The unit coulomb/sec is expressed as...
    [A] Ampere [B] Volt [C] Ohm [D] Watt
  56. The SI unit of electric current is...
    [A] Ohm [B] Coulomb [C] Ampere [D] Volt
  57. If the electric charge passing through a conductor in 5 minutes is 480 C, the current flowing through it is...
    [A] 96 [B] 2400 [C] 1.6 [D] 2.4
  58. Which device is used to measure electrical potential difference?
    [A] Ammeter [B] Voltmeter [C] Wattmeter [D] Galvanometer
  59. The SI unit of electrical potential difference is...
    [A] Ampere [B] Ohm [C] Weber [D] Volt
  60. 1.5 C charge is moved from a point at 5 V potential to a point at 8 V potential. What is the amount of work done in joule?
    [A] 1.5 [B] 2.0 [C] 3.0 [D] 4.5
  61. If the work done to move 4 C charge from one point to another point is 10 joule, what is the potential difference between those points?
    [A] 2.5 V [B] 40 V [C] 14 V [D] 160 V
  62. Which of the following is true?
    [A] Joule = (volt/coulomb)  [B] Volt = (joule/coulomb)
    [C] Coulomb = (volt/joule) [D] Coulomb = (joule x volt)
  63. According to Ohm's law...
    [A] Current increases linearly with increase in voltage.
    [B] The current ---> voltage graph is a straight line.
    [C] The ratio of voltage and current is constant.
    [D] All three in A, B and C are correct.
  64. The SI unit of resistance is...
    [A] volt [B] volt.ampere [C] ampere/volt [D] volt/ampere
  65. Which of the following materials has least resistance?
    [A] Aluminium [B] Glass [C] Carbon [D] Silicon
  66. 1.5 A current flows through a resistor when it is connected to a circuit with 3 V potential difference. What is the value of resistance?
    [A] 4.5Ω [B] 2Ω [C] 0.5Ω [D] 1.5Ω
  67. When a 15V battery is connected across a resistor of 6Ω, the amount of charge passing through it per second is...
    [A] 90 C [B] 2/3 C [C] 2.5 C [D] 9 C
  68. If the resistance of a circuit is doubled and the applied potential difference is halved, the current passing through the circuit will ...
    [A] become 1/4 of original  [B] become 1/2 of original
    [C] become 4 times original [D] not change
  69. If the resistance of a circuit is halved and the applied potential difference is doubled, the current passing through the circuit will ...
    [A] become 1/4 of original  [B] become 1/2 of original
    [C] become 4 times original [D] not change
  70. A 200 m long wire has cross sectional area of 10-6 sq. m and its material has resistivity of 10-7Ω.m. What will be its resistance?
    [A] 0.2Ω [B] 2Ω [C] 20Ω [D] 200Ω
  71. When two resistors with resistances R1 and R2 are connected in series and parallel, their equivalent resistances are R3 and R4, respectively. Then...
    [A] R1R2 = R3R4 [B] R1R3 = R2R4 [C] R1R4 = R3R2 [D] R1R2R3R4 = 1
  72. When two resistors with resistance of 10Ω and 20Ω are connected in series with a 3 V battery, the current passing through the circuit will be...
    [A] 0.1 A [B] 1 A [C] 2 A [D] 3 A
  73. When two resistors of 6Ω and 6Ω are connected in parallel with a 12V battery, the current flowing through the circuit is...
    [A] 1.0 A [B] 2.0 A [C] 4.0 A [D] 0.25 A
  74. The kilowatt-hour is a unit of...
    [A] electrical potential [B] electric power [C] electric energy [D] electric current
  75. 7.2 x 109 joule = _____ units of electrical energy.
    [A] 0.2 [B] 20 [C] 2000 [D] 5000
  76. An electric lamp draws a current of 0.5 A when connected to a 9V battery. What is the power rating of the bulb?
    [A] 4.5 W [B] 18 W [C] 41.5 W [D] 2.25 W
  77. If an electric iron has power rating of 2 kW, the cost of energy consumed for 24 hours at the rate of Rs. 6 per unit is equal to...
    [A] Rs. 48 [B] Rs. 144 [C] Rs. 72 [D] Rs. 288
  78. How many joules of energy is transferred by an electric bulb of 60 W power rating in one minute?
    [A] 60 [B] 1000 [C] 3600 [D] 6000
  79. A bulb has rating 12 V, 1 A. How much energy is consumed by it in 10 minutes?
    [A] 120 J [B] 1200 J [C] 720 J [D] 7200 J
  80. Match the physical quantities in Part A with their units in Part B.

    [A] 1-c, 2-a, 3-d, 4-b [B] 1-c, 2-b, 3-d, 4-a
    [C] 1-b, 2-d, 3-c, 4-a [D] 1-b, 2-a, 3-d, 4-c
  81. Match the physical quantity in Part A with formula in Part B.

    [A] 1-c, 2-d, 3-a, 4-b [B] 1-b, 2-d, 3-a, 4-c
    [C] 1-b, 2-c, 3-d, 4-a [D] 1-c, 2-b, 3-a, 4-d
  82. Which of the following circuit symbol represents electric cell?

  83. Which of the following circuit symbol represents a resistor?

  84. What will be the equivalent resistance in the following circuit?

    [A] 2 Ω [B] 3 Ω [C] 4 Ω [D] 6 Ω
  85. What will be the equivalent resistance between points A and b in the following circuit?

    [A] 1 Ω [B] 2 Ω [C] 3 Ω [D] 4 Ω
  86. What will be the equivalent resistance between points A and b in the following circuit?

    [A] 1 Ω [B] 2 Ω [C] 3 Ω [D] 4 Ω
  87. Which of the following circuits has the lowest equivalent resistance?

    [A] Figure 1 [B] Figure 2 [C] Figure 3 [D] Figure 4
  88. Two resistors each of value R are connected in series in a circuit with V volt battery. If two more resistances each of magnitude R are connected in series in this circuit, the current in the circuit will...
    [A] become double [B] become half [C] not change [D] become one fourth
  89. In an electric circuit, three bulbs of 40W, 60W and 100W are connected in series. The voltage drop is maximum across ____ bulb.
    [A] 40W [B] 60W [C] 100W [D] None
  90. According to Ohm's law, voltage drop is inversely proportional to...
    [A] I [B] 1/I [C] R [D] 1/R
  91. A 2 kW heater works on domestic voltage main supply. What should be the current rating of the fuse?
    [A] 2 A [B] 5 A [C] 10 A [D] 6 A
  92. 6 C charge is passing through an electric bulb in one minute. How much current will pass through it?
    [A] 10 A [B] 1 A [C] 0.1 A [D] 0.01 A
  93. On what does the heat produced in a resistance depend?
    [A] Electric current passed          [B] Resistance 
    [C] Time for which current is passed [D] All of these
  94. The electric force between two charges, q1 and q2, is ______ proportional to the product of the magnitudes of the charges and _____ proportional to the square of the distance between them.
    [A] directly, inversely [B] directly, directly 
    [C] inversely, directly [D] inversely, inversely
  95. The resistance of a conductor is R. The resistance of another conductor of identical material and equal length with twice the diameter is...
    [A] R/4 [B] R/2 [C] 2R [D] 4R
  96. Which of the following combinations of length(l) and cross-sectional area(A) will give a certain volume of copper the least resistance?
    [A] l and A [B] 2l and A/2 [C] l/2 and 2A [D] none as the volume is same
  97. A resistor R1 dissipates power P when connected to a certain generator. If a resistor R2 is inserted in series with R1, the power dissipated by R1...
    [A] decreases [B] increases [C] remains the same [D] any of the above depending on R1 and R2
  98. A resistor R1 dissipates power P when connected to a certain generator. If a resistor R2 is inserted in parallel with R1, the power dissipated by R1...
    [A] decreases [B] increases [C] remains the same [D] any of the above depending on R1 and R2
  99. A 20-V potential difference is applied across a series combination of a 10 Ω and a 30 Ω resistors. The current in the 10 Ω resistor is...
    [A] 0.5 A [B] 0.67 A [C] 1 A [D] 2 A
  100. Two identical resistors in parallel have an equivalent resistance of 2 Ω. If the resistors were in series, their equivalent resistance would be...
    [A] 2 Ω [B] 4 Ω [C] 8 Ω [D] 16 Ω
  101. A 12-V potential difference is applied across a series combination of four 6Ω resistors. The current in each resistor is...
    [A] 0.5A [B] 2A [C] 8A [D] 18A
  102. A 12-V potential difference is applied across a parallel combination of four 6Ω resistors. The current in each resistor is...
    [A] 0.5A [B] 2A [C] 8A [D] 18A
  103. If a charge of Q coulomb flows in a part of a circuit across which there is a potential difference of V volt then the energy change W in joule is given by...
    [A] Q.V [B] Q/V [C] V/Q [D] Q2/V

  104. [A][B][C][D]


ANSWERS


(1) D (2) C (3) B (4) A (5) C (6) B (7) C (8) C (9) A (10) B (11) C (12) D (13) D (14) A (15) B (16) D (17) A (18) C (19) A (20) A (21) D (22) D (23) B (24) A (25) C (26) C (27) D (28) C (29) C (30) B (31) D (32) A (33) C (34) A (35) D (36) C (37) B (38) A (39) C (40) D (41) B (42) A (43) C (44) C (45) A (46) C (47) B (48) D (49) D (50) C (51) A (52) C (53) C (54) B (55) A (56) C (57) C (58) B (59) D (60) D (61) A (62) A (63) D (64) D (65) A (66) B (67) C (68) D (69) C (70) C (71) A (72) A (73) C (74) C (75) C (76) A (77) D (78) C (79) D (80) C (81) B (82) A (83) B (84) B (85) B (86) B (87) A (88) B (89) C (90) B (91) B (92) C (93) D (94) A (95) A (96) C (97) A (98) C (99) A (100) C (101) A (102) B (103) A

1 comment: