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MCQs

Total Questions : 219 | Page 7 of 22 pages
Question 61. A thermistor has
  1.    Positive temperature coefficient
  2.    Negative temperature coefficient
  3.    Zero temperature coefficient
  4.    Variable temperature coefficient
 Discuss Question
Answer: Option C. -> Zero temperature coefficient
Question 62. The S.I. unit of power is
  1.    Henry
  2.    Coulomb
  3.    Watt
  4.    Watt-hour
 Discuss Question
Answer: Option C. -> Watt
Question 63. All of the following are equivalent to watt except
  1.    (Amperes) ohm
  2.    Joules/sec.
  3.    Amperes × volts
  4.    Amperes/volt
 Discuss Question
Answer: Option D. -> Amperes/volt
Question 64. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes
  1.    1/9 times
  2.    3 times
  3.    9 times
  4.    Unchanged
 Discuss Question
Answer: Option C. -> 9 times
Question 65. Bulbs in street lighting are all connected in
  1.    Parallel
  2.    Series
  3.    Series-parallel
  4.    End-to-end
 Discuss Question
Answer: Option A. -> Parallel
Question 66. With rise in temperature the resistance of semiconductors
  1.    Decreases
  2.    Increases
  3.    First increases and then decreases
  4.    Remains constant
 Discuss Question
Answer: Option A. -> Decreases
Question 67. An electric filament bulb can be worked from
  1.    D.C. supply only
  2.    A.C. supply only
  3.    Battery supply only
  4.    All above
 Discuss Question
Answer: Option D. -> All above
Question 68. When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
  1.    1 n-mho
  2.    106 mho
  3.    1 milli-mho
  4.    None of the above
 Discuss Question
Answer: Option A. -> 1 n-mho
Question 69. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
  1.    Two in parallel
  2.    Two in parallel and one in series
  3.    Three in parallel
  4.    Three in series
 Discuss Question
Answer: Option B. -> Two in parallel and one in series
Question 70. Which of the following materials has a negative temperature coefficient of resistance?
  1.    Copper
  2.    Aluminum
  3.    Carbon
  4.    Brass
 Discuss Question
Answer: Option C. -> Carbon

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