ONLINE MCQ EE-RESISTANCE AND OHM`S LAW 6

Q51. Resistance of a wire always increases if
 A.  temperature is reduced.  B.  temperature is increased.
 C.  number of free electrons available become less.  D.  number of free electrons available become more.

 

Q52. The
temperature coefficient of resistance of a wire is 0.0008°C. If the
resistance of the wire is 8 ohm at 0°C, what is the resistance at 100°C?
 A.  8.64 Ohm.  B.  8.08 Ohm.
 C.  7.92 Ohm.  D.  7.20 Ohm

 

Q53. If the length of a wire of resistance R is uniformly stretched to n
times its original value, its new resistance is
 A.  n R  B.  R/n
 C.  n2R  D.  R/n2

 

Q54. Specific resistance of a conductor depends upon
 A.  dimensions of the conductor.  B.  composition of conductor material.
 C.  resistance of the conductor  D.  both (a) and (b).

 

Q55. Which of the following materials possesses the least specific
resistance?
 A.  Aluminum.  B.  Copper.
 C.  Silver.  D.  Iron.

 

Q56. The
insulation resistance of a cable of length 10 km is 1 Mega Ohm’s. For a
length of 100 km of same cable, the insulation resistance will be
 A.  1 Mega Ohm  B.  10 Mega Ohm
 C.  0.1 Mega Ohm  D.  0.01 Mega Ohm

 

Q57. The hot resistance of the filament of a bulb is higher than the cold
resistance because the temperature coefficient of the filament is
 A.  negative.  B.  infinite.
 C.  zero.  D.  positive.

 

Q58. The temperature coefficient of resistance of an insulator is
 A.  positive and independent oftemperature.  B.  negative and independent of temperature.
 C.  negative and dependent on temperature.  D.  positive and dependent on temperature

 

Q59. Four resistances 80 ω, 50 ω, 25 ω and R are connected in parallel.
Current through 25 ω resistance is 4 A. Total current of the supply
is 10 A. The value of R will be
 A.  66.66 ω  B.  40.25 ω
 C.  36.36 ω  D.  76.56 ω

 

Q60. Three parallel resistive branches are connected across a dc supply.
What will be the ratio of the branch currents I1 : I2 : I3 if the branch
resistances are in the ratio R1 : R2 : R3 : : 2 : 4 : 6 ?
 A.  3 : 2 : 6  B.  2 : 4 : 6
 C.  6 : 3 : 2  D.  6 : 2 : 4

 

                       Part 1 Part 2 Part 3  Part 4   Part 5  Part 6  Part 7

ONLINE MCQ EE-RESISTANCE AND OHM`S LAW 7
ONLINE MCQ EE-RESISTANCE AND OHM`S LAW 5

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