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MCQs

Total Questions : 219 | Page 8 of 22 pages
Question 71. Which of the following material has nearly zero temperature coefficient of resistance?
  1.    Manganin
  2.    Porcelain
  3.    Carbon
  4.    Copper
 Discuss Question
Answer: Option A. -> Manganin
Question 72. Conductance: mho ::
  1.    Resistance : ohm
  2.    Capacitance : Henry
  3.    Inductance : farad
  4.    lumen : steradian
 Discuss Question
Answer: Option A. -> Resistance : ohm
Question 73. The thickness of insulation provided on the conductor depends on
  1.    The magnitude of voltage on the conductor
  2.    The magnitude of current flowing through it
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option A. -> The magnitude of voltage on the conductor
Question 74. All good conductors have high
  1.    Conductance
  2.    Resistance
  3.    Reluctance
  4.    Thermal conductivity
 Discuss Question
Answer: Option A. -> Conductance
Question 75. What will be energy used by the battery if the battery has to drive 6.28 x 10¹⁸ electrons with potential difference of 20 V across the terminal ?
  1.    5 joules
  2.    10 joules
  3.    15 joules
  4.    20 joules
 Discuss Question
Answer: Option D. -> 20 joules
Question 76. Which is the best conductor of electricity?
  1.    Iron
  2.    Silver
  3.    Copper
  4.    Carbon
 Discuss Question
Answer: Option B. -> Silver
Question 77. Heat in a conductor is produced on the passage of electric current due to
  1.    reactance
  2.    capacitance
  3.    impedance
  4.    resistance
 Discuss Question
Answer: Option D. -> resistance
Question 78. Resistance of carbon filament lamp as the applied voltage increases.
  1.    Increases
  2.    Decreases
  3.    Remains same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Decreases
Question 79. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be
  1.    1 Q
  2.    2 Q
  3.    3 Q
  4.    4 Q
 Discuss Question
Answer: Option D. -> 4 Q
Question 80. Two resistors are said to be connected in series when
  1.    Same current passes in turn through both
  2.    Both carry the same value of current
  3.    Total current equals the sum of branch currents
  4.    Sum of IR drops equals the applied e.m.f.
 Discuss Question
Answer: Option A. -> Same current passes in turn through both

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