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MCQs

Total Questions : 219 | Page 9 of 22 pages
Question 81. When one leg of parallel circuit is opened out the total current will
  1.    Reduce
  2.    Increase
  3.    Decrease
  4.    Become zero
 Discuss Question
Answer: Option C. -> Decrease
Question 82. Resistance of a tungsten lamp as applied voltage increases
  1.    Decreases
  2.    Increases
  3.    Remains same
  4.    None of the above
 Discuss Question
Answer: Option B. -> Increases
Question 83. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
  1.    3/2 Q
  2.    6 Q
  3.    4 Q
  4.    8/3 Q
 Discuss Question
Answer: Option C. -> 4 Q
Question 84. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be
  1.    160 ohms
  2.    80 ohms
  3.    20 ohms
  4.    10 ohms
 Discuss Question
Answer: Option D. -> 10 ohms
Question 85. The condition for the validity under Ohm’s law is that
  1.    resistance must be uniform
  2.    current should be proportional to the size of the resistance
  3.    resistance must be wire wound type
  4.    temperature at positive end should be more than the temperature at negative end
 Discuss Question
Answer: Option A. -> resistance must be uniform
Question 86. The condition for the validity under Ohm's law is that
  1.    Resistance must be uniform
  2.    Current should be proportional to the size of the resistance
  3.    Resistance must be wire wound type
  4.    Temperature at positive end should be more than the temperature at negative end
 Discuss Question
Answer: Option A. -> Resistance must be uniform
Question 87. Which of the following can have negative temperature coefficient?
  1.    Compounds of silver
  2.    Liquid metals
  3.    Metallic alloys
  4.    Electrolytes
 Discuss Question
Answer: Option D. -> Electrolytes
Question 88. Which one of the following does not have negative temperature coefficient?
  1.    Aluminium
  2.    Paper
  3.    Rubber
  4.    Mica
 Discuss Question
Answer: Option A. -> Aluminium
Question 89. The property of a conductor due to which it passes current is called
  1.    Resistance
  2.    Reluctance
  3.    Conductance
  4.    Inductance
 Discuss Question
Answer: Option C. -> Conductance
Question 90. The substances which have a large number of free electrons and offer a low resistance are called
  1.    Insulators
  2.    Inductors
  3.    Semiconductors
  4.    Conductors
 Discuss Question
Answer: Option D. -> Conductors

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