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MCQs

Total Questions : 219 | Page 6 of 22 pages
Question 51. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
  1.    4 : 25
  2.    25 : 4
  3.    2 : 5
  4.    5 : 2
 Discuss Question
Answer: Option C. -> 2 : 5
Question 52. For testing appliances, the wattage of test lamp should be
  1.    Very low
  2.    Low
  3.    High
  4.    Any value
 Discuss Question
Answer: Option C. -> High
Question 53. A rheostat differs from potentiometer in the respect that it
  1.    Has lower wattage rating
  2.    Has higher wattage rating
  3.    Has large number of turns
  4.    Offers large number of tapping
 Discuss Question
Answer: Option B. -> Has higher wattage rating
Question 54. Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
  1.    Varistors
  2.    Thermistor
  3.    Semiconductors
  4.    Variable resistors
 Discuss Question
Answer: Option C. -> Semiconductors
Question 55. In a series circuit with unequal resistances
  1.    The highest resistance has the most of the current through it
  2.    The lowest resistance has the highest voltage drop
  3.    The lowest resistance has the highest current
  4.    The highest resistance has the highest voltage drop
 Discuss Question
Answer: Option D. -> The highest resistance has the highest voltage drop
Question 56. The resistance of a conductor varies inversely as
  1.    Length
  2.    Area of cross-section
  3.    Temperature
  4.    Resistivity
 Discuss Question
Answer: Option B. -> Area of cross-section
Question 57. A resistance having rating 10 ohms, 10 W is likely to be a
  1.    Metallic resistor
  2.    Carbon resistor
  3.    Wire wound resistor
  4.    Variable resistor
 Discuss Question
Answer: Option C. -> Wire wound resistor
Question 58. If the efficiency of a machine is to be high, what should be low?
  1.    Input power
  2.    Losses
  3.    True component of power
  4.    kWh consumed
 Discuss Question
Answer: Option B. -> Losses
Question 59. Nichrome wire is an alloy of
  1.    Lead and zinc
  2.    Chromium and vanadium
  3.    Nickel and chromium
  4.    Copper and silver
 Discuss Question
Answer: Option C. -> Nickel and chromium
Question 60. Resistance of 220 V, 100 W lamp will be
  1.    4.84 Q
  2.    48.4 Q
  3.    484 ft
  4.    4840 Q
 Discuss Question
Answer: Option C. -> 484 ft

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