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MCQs

Total Questions : 219 | Page 2 of 22 pages
Question 11. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
  1.    10 W
  2.    20 W
  3.    40 W
  4.    60 W
 Discuss Question
Answer: Option D. -> 60 W
Question 12. The insulation on a current carrying conductor is provided
  1.    To prevent leakage of current
  2.    To prevent shock
  3.    Both of above factors
  4.    None of above factors
 Discuss Question
Answer: Option C. -> Both of above factors
Question 13. Out of the following which is not a poor conductor?
  1.    Cast iron
  2.    Copper
  3.    Carbon
  4.    Tungsten
 Discuss Question
Answer: Option B. -> Copper
Question 14. Which of the following statement is true both for a series and a parallel D.C. circuit?
  1.    Elements have individual currents
  2.    Currents are additive
  3.    Voltages are additive
  4.    Power are additive
 Discuss Question
Answer: Option D. -> Power are additive
Question 15. When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will
  1.    Decrease
  2.    Increase
  3.    Remain constant
  4.    None of the above
 Discuss Question
Answer: Option B. -> Increase
Question 16. Voltage dependent resistors are usually made from
  1.    Charcoal
  2.    Silicon carbide
  3.    Nichrome
  4.    Graphite
 Discuss Question
Answer: Option C. -> Nichrome
Question 17. The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around
  1.    1.2 x 10-8 ω-m
  2.    1.4 x 10-8 ω-m
  3.    1.6 x 10-8 ω-m
  4.    1.8 x 10-8 ω-m
 Discuss Question
Answer: Option C. -> 1.6 x 10-8 ω-m
Question 18. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
  1.    50 %
  2.    60 %
  3.    100 %
  4.    150 %
 Discuss Question
Answer: Option A. -> 50 %
Question 19. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
  1.    33 V
  2.    66 V
  3.    80 V
  4.    132 V
 Discuss Question
Answer: Option B. -> 66 V
Question 20. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes
  1.    0.4 ohm
  2.    0.6 ohm
  3.    0.8 ohm
  4.    1.0 ohm
 Discuss Question
Answer: Option A. -> 0.4 ohm

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