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MCQs

Total Questions : 219 | Page 19 of 22 pages
Question 181. Which of the following quantities remain the same in all parts of a series circuit?
  1.    Resistance
  2.    Current
  3.    Power
  4.    Voltage
 Discuss Question
Answer: Option B. -> Current
Question 182. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals
  1.    20 W
  2.    60 W
  3.    40 W
  4.    10 W
 Discuss Question
Answer: Option B. -> 60 W
Question 183. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
  1.    1/3 times
  2.    3 times
  3.    1/9 times
  4.    9 times
 Discuss Question
Answer: Option C. -> 1/9 times
Question 184. The insulation on a current carrying conductor is provided
  1.    To prevent leakage of current
  2.    None of above factors
  3.    To prevent shock
  4.    Both of the listed here
 Discuss Question
Answer: Option D. -> Both of the listed here
Question 185. 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.    Increase
  2.    None of these
  3.    Decrease
  4.    Remain constant
 Discuss Question
Answer: Option A. -> Increase
Question 186. Voltage dependent resistors are usually made from
  1.    Charcoal
  2.    Nichrome
  3.    Graphite
  4.    Silicon carbide
 Discuss Question
Answer: Option B. -> Nichrome
Question 187. 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.    1.8 x 10-8 ω-m
  4.    1.6 x 10-8 ω-m
 Discuss Question
Answer: Option D. -> 1.6 x 10-8 ω-m
Question 188. Which of the following statement is true both for a series and a parallel D.C. circuit?
  1.    Power are additive
  2.    Currents are additive
  3.    Elements have individual currents
  4.    Voltages are additive
 Discuss Question
Answer: Option A. -> Power are additive
Question 189. In the case of direct current
  1.    Magnitude of current changes with time
  2.    Magnitude and direction of current changes with time
  3.    Magnitude and direction of current remains constant
  4.    Magnitude of current remains constant
 Discuss Question
Answer: Option C. -> Magnitude and direction of current remains constant
Question 190. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
  1.    33 V
  2.    132 V
  3.    80 V
  4.    66 V
 Discuss Question
Answer: Option D. -> 66 V

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