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MCQs

Total Questions : 71 | Page 4 of 8 pages
Question 31. We have three resistances of values 2 Ω, 3 Ω and 6 Ω. Which of the following combination will give an effective resistance of 4 Ω?
  1.    All the three resistances in parallel
  2.    2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance
  3.    3 Ω resistance in series with parallel combination of 2 Ω and 6 Ω resistance
  4.    6 Ω resistance in series with parallel combination of 2 Ω and 3 Ω resistance
 Discuss Question
Answer: Option B. -> 2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance


2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance


Question 32. Which of the following could be the value of resistivity of copper?
  1.    1.7 x 10-8 ohm-cm
  2.    1.7 x 10-6 ohm-cm
  3.    1.6 x 10-5 ohm-cm
  4.    1.7 x 10-4 ohm-cm
 Discuss Question
Answer: Option B. -> 1.7 x 10-6 ohm-cm


1.7 x 10-6 ohm-cm


Question 33. Conductance is expressed in terms of
  1.    ohm / m
  2.    m / ohm
  3.    mho / m
  4.    mho
 Discuss Question
Answer: Option D. -> mho


mho


Question 34. A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is vd. If the diameter of wire is made d/3, then drift velocity becomes
  1.    9 vd
  2.    vd / 9
  3.    vd /3
  4.    vd
 Discuss Question
Answer: Option D. -> vd


vd


Question 35. Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are
  1.    3 ohms and 6 ohms
  2.    3 ohms and 9 ohms
  3.    1.5 ohms and 3 ohms
  4.    1.5 ohms and 0.5 ohms
 Discuss Question
Answer: Option C. -> 1.5 ohms and 3 ohms


1.5 ohms and 3 ohms


Question 36. Two 1 kilo ohm, 1/2 W resistors are connected in series. Their combined resistance value and wattage will be
  1.    2 kΩ, 1/2 W
  2.    2 kΩ, 1 W
  3.    2 kΩ, 2 W
  4.    l kΩ, 1/2 W
 Discuss Question
Answer: Option B. -> 2 kΩ, 1 W


2 kΩ, 1 W


Question 37. The resistance of a 100 W, 200 V lamp is
  1.    100 ohm
  2.    200 ohm
  3.    400 ohm
  4.    1600 ohm
 Discuss Question
Answer: Option C. -> 400 ohm


400 ohm


Question 38. The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly
  1.    4
  2.    2
  3.    1 / 2
  4.    1 / 4
 Discuss Question
Answer: Option A. -> 4


4


Question 39. Which of the following bulbs will have the least resistance ?
  1.    220 V, 60 W
  2.    220 V, 100 W
  3.    115 V, 60 W
  4.    115 V, 100 W
 Discuss Question
Answer: Option D. -> 115 V, 100 W


115 V, 100 W


Question 40. The unit of electrical conductivity is
  1.    mho / metre
  2.    mho / sq.m
  3.    ohm / metre
  4.    ohm / sq.m
 Discuss Question
Answer: Option A. -> mho / metre


mho / metre


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