CURRENT ELECTRICITY PART 6

CURRENT ELECTRICITY PART 6

51. Three  60 watt bulbs in parallel across the 60 volt power line.If one bulb burns open

a. there will be heavy current in the  main line

b. rest of the two bulbs will not light 

c. all three bulbs will light

 d.the outer two bulbs will light

52. The four bulbs of 40 watt  is connected in series with a battery across them which of the following statement is true

a. the current through each  bulb in same 

b.the voltage across each bulb is not same 

c.the power dissipation in each bulb is not same 

d. None of the above

53. Two resistance R1 and R2 are connected in series across the voltage source Where R2>R1.The voltage drop will be across.

A. R2

b.R1

c. Either R1 & R2

d. None of these

54. What will be energy used by the battery if the battery has to drive 6.28 × 10^18  electrons with potential difference of 20 volt across the terminal

a.5 joules 

b.10 joules

c. 15 joules

d.20 joules

55. A closed switch has a resistance of 

a.zero 

b.about 50 ohms

c.about 500 ohms 

d.infinity

56. The hot resistance of the bulb filament is higher than its cold  resistance because the temperature coefficient of the filament is 

a.Zero 

b. Negative

c. positive

d. about 2 ohms per degree

57.Heat in a conductor is produced on passage of electric current due to 

a.reactance 

b.capacitance

c. impedance 

d.resistance

58.  The insulation on a current carrying conductor is provided 

a. To  prevent leakage of current 

b. To  prevent shock

c. Both of the above factors

d. none of the above factors

59. The thickness of insulation provided on the conductor depends on

a. The magnitude of voltage on the conductor

b. The magnitude of current following through

c. Both (a) & (b) 

d.none of the above

60. Which of the  following quantities remains the same in all part of the series circuit 

a.voltage

b. Current

c.  power

d. resistance

************************************

51.d.  52.a,. 53.a,   54.d,.  55.a ,  56.c, 57.d,  58.c  59.a, 60.b

 

BEST OF LUCK