26. The resistance of a conductor is R, if its length and cross sectional area are doubled then the resistance is
      ^{A) R/2        B) 2 R       C) R       D) 4 R}
 

27. Given R₁ = 100 Ω, R₂ = 1 Ω then the effective resistance when these are connected in parallel
      A) 0.1 Ω       B) 0.5 Ω       C) 0.99 Ω       D) 0.10 Ω
 

28. Ten identical resistances, each having a resistance of 1 Ω are joined in parallel, The combination has the resultant resistance of
      A) 1 Ω       B) 10 Ω       C) 0.1 Ω       D) 0.01 Ω
 

29. Five identical resistances, each having a resistance of 2 Ω are joined in parallel, then the combination has the resultant resistance of
      A) 2 Ω       B) 10 Ω       C) 0.04 Ω       D) 0.4 Ω
 

30. The resultant of two resistances in series is 28 Ω. If one of them is 17 Ω. The resistance of second is
      A) 20 Ω       B) 45 Ω       C) 23 Ω       D) 11 Ω
 

31. Three resistors values 2 Ω, 8 Ω, 12 Ω are connected in parallel. The equivalent resistance of combination is

      A) 10 Ω       B) 20 Ω       C) 30 Ω       D) None of these
 

32. We are fuses in household circuits to
      A) prevent overloading of house hold circuits      B) prevent fire accident
      C) Both A and B                                                        D) to decrease the power consumption
 

33. Overloading of household circuit means
      A) Increasing the number of electric appliances consuming power more than 4.8 kW
      B) The household circuits draw the current from mains more than 20 A.
      C) Both A and B
      D) The household circuits draw the current from mains more than 40 A.
 

34. At the time of short circuit the current in the circuit
      A) increase heavily       B) reduces      C) does not change       D) None of these
 

35. The main use of the fuse is

      A) to stop the high current       B) to avoid the accidental flames
      C) to avoid short circuit             D) All the above
 

36. Characters of a fuse wire
      A) Low resistance                            B) High resistance
      C) Low melting temperature         D) High melting temperature
 

37. kWh is the unit of
      A) Potential       B) Current      C) Electric energy       D) emf
 

38. If a bulb of 100 watts glows for 20 hours the energy utilised in kWH is
      A) 1       B) 2       C) 5       D) None of these
 

39. Five 60 W bulbs are working for 8 hours per a day. If the charge to be paid per unit is 80 paise. The amount to be paid for a month of 30 days is
      A) Rs.72.00 P       B) Rs.50.60 P       C) Rs.57.00 P       D) Rs.57.60 P

40. A 750 W Iron box is used for 5 hours. Charge per unit is 0.80 paise. What is the amount to be paid

      A) Rs.3.70 P       B) Rs.2.70 P       C) Rs.3.50 P       D) Rs.3.00 P
 

41. On everyday a 60 W bulb is used for 8 hours. The amount of energy utilised in 30 days in kilowatt hours
      A) 7.2       B) 5.2       C) 16.2       D) 14.4
 

42. As shown in the below diagram, four resistances are connected. The effective resistance of the combination between the points X and Y is

     ^{A) 3/25 Ω         B)  20/3 Ω         C) 20 Ω         D) 3 Ω} 

43. How will the resistance of a wire of given material change if the length is doubled with same area of cross-section?

      A) No change       B) halved       C) doubled       D) None of these
 

44. How will the resistance of a wire of given material change if the length is halved with same area of cross-section
      A) No change       B) halved      C) doubled       D) Becomes 4 times
 

45. How will the resistance of a wire of given material change if its area of cross-section is doubled with same length
      A) No change       B) halved      C) doubled       D) Becomes 4 times
 

46. How will the resistance of a wire of given material change if its cross-sectional area is halved with same length
      A) No change       B) halved      C) doubled       D) becomes 4 times
 

47. How will the resistance of wire of given material change if the length and area of cross section both are doubled
      A) halved       B) doubled      C) No change       D) becomes 4 times

48. How will the resistance of a wire of give material change if its length and area of cross section both are halved

      A) halved       B) doubled      C) becomes 4 times       D) No change
 

^{49. The effective resistance of R₁ and R₂ who connected in series is 6 Ω when connected in parallel it is 5/6 Ω. Then the actual value of R₁ and R₂ are respectively}
      A) 1.5 Ω, 4.5 Ω       B) 2 Ω, 4 Ω       C) 3 Ω, 3 Ω       D) 5Ω , 1Ω
 

50. The resistance of two resistors are 6 Ω, 12 Ω, when connected in series and parallel are respectively
      A) 3 Ω, 6 Ω       B) 18 Ω, 3 Ω       C) 18 Ω, 8 Ω       D) 18 Ω, 4 Ω
 

51. A short circuit happens because of
      A) Dry wires       B) Contact between the wires      C) Lack of earthing       D) All of these
 

52. Overloading happens because
      A) Connecting many appliances to a single socket      B) Short circuit
      C) hike in the supply voltage                                          D) Any of these

53. An electric fuse is based on

      A) The magnetic effect of the current         B) The heating effect of the current
      C) The chemical effect of the current          D) None of the above
 

54. The most important safety method used for protecting home appliances from short circuiting or overloading is
      A) Use of electric meter       B) Use of stabilizers      C) Use of fuse       D) Earthing


The equivalent resistance between the terminals A and B of the circuit

      A) 10 Ω       B) 20 Ω       C) 4 Ω       D) 5 Ω
 

56. 2, 4, 8 Ohms resistance are connected in series, then the effective resistance is
      A) 2 Ω       B) 4 Ω       C) 8 Ω       D) 14 Ω
 

57. 2, 4, 8 Ohms resistances are connected in parallel, then the effective resistance is
      ^{A) 7/8 Ω       B) 8/7 Ω       C) 5/16  Ω       D) 16/5 Ω} 
 

58. The effective resistance of the following circuit between A and B is
         
      A) 14 Ω       B) 6 Ω       C) 3 Ω       D) 13 Ω
 

59. The equivalent resistance of the combination shown in below diagram is
          
      A) 30 Ω       B) 20 Ω       C) 15 Ω       D) 10 Ω
 

60. The effective resistance of the combination between points A and B as shown in the below diagram is

                               
      ^{A) 20 Ω       B) 10 Ω       C) 20/3  Ω       D) 3/25  Ω} 
 

61. The effective resistance between the terminals A and B in the network as shown in the below diagram is
                 
      A) 15 Ω       B) 10 Ω       C) 6 Ω       D) 25 Ω
 

62. The effective resistance between the terminals A and B in the network as shown in the below diagram is
                   
      A) 5 Ω       B) 10 Ω       C) 15 Ω       D) 25 Ω
 

63. In the below given circuit diagram the value of I₁ : I₂ is
                     
      A) 2 : 1       B) 1 : 2       C) 1 : 4       D) 4 : 1
 

64. The defect in the below circuit diagram is

                 

      A) Voltmeter connected in series      B) Voltmeter connected in parallel
      C) Ammeter connected in series        D) Ammeter connected in parallel
 

65. The effective resistance between A and B is
                  
      A) 8 Ω       B) 10 Ω       C) 16 Ω       D) 24 Ω
 

66. Five identical resistances R each are connected as shown in figure. The effective resistance between A and B
                  
      ^{A) 2/R       B) R       C) 2R       D) R/2} 
 

67. Three resistances 2 Ω, 8 Ω, and R Ω are connected in series. If the effective resistance of the combination 16 Ω, then the value of R is
      A) 16 Ω       B) 10 Ω       C) 8 Ω       D) 6 Ω
 

68. A uniform wire of resistance R Ω is divided into 10 parts and all of them are connected in parallel. The equivalent resistance will be
      A) 0.1 R Ω       B) 0.01 R Ω       C) 10 Ω       D) 1 Ω
 

69. The rate of electrical work done is called

      A) Electric potential                             B) Electric power
      C) Electro chemical equivalent           D) Mechanical equivalent of heat
 

70. When three resistances R₁, R₂ and R₃ are in parallel, effective resistance 'Req' is given by
      

71. Your friend arranged a circuit, after measured potential difference in between A and B with the help of voltmeter, then which of the following is correct?
      A) Potential difference shows E for sometime and zero for sometime
      B) Potential difference is zero
      C) Potential difference is equal to E
      D) Potential difference is equal to 2E
 

72. Observe the circuit. The resistance of ring shaped conductor is zero. Then the equivalent resistance between A and B is

      A) 2 R
      B) 4 R 
      C) 7 R 
      D) 10 R
 

73. Which one of the following is correct regarding the instruments connected in an electric circuit

A) In electric circuit voltmeter is in series, Ammeter is connected in parallel.
B) In electric circuit voltmeter is connected parallel to battery, ammeter connected in series.
C) Ammeter and voltmeter both are connected in series.
D) Ammeter and voltmeter both are connected in parallel.