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MCQs

Total Questions : 330 | Page 10 of 33 pages
Question 91. What is the energy in a capacitor if the voltage is 5V and the charge is10C?
  1.    25J
  2.    35J
  3.    54J
  4.    55J
 Discuss Question
Answer: Option A. -> 25J
Answer: (a).25J
Question 92. At DC, capacitor acts as _________
  1.    Open circuit
  2.    Short circuit
  3.    Resistor
  4.    Inductor
 Discuss Question
Answer: Option A. -> Open circuit
Answer: (a).Open circuit
Question 93. In an RC series circuit, when the switch is closed and the circuit is complete, what is the response?
  1.    Response does not vary with time
  2.    Decays with time
  3.    Increases with time
  4.    First increases, then decrease
 Discuss Question
Answer: Option B. -> Decays with time
Answer: (b).Decays with time
Question 94. Energy stored in 2000mF capacitor charged to a potential difference of 10V is?
  1.    100J
  2.    200J
  3.    300J
  4.    400J
 Discuss Question
Answer: Option A. -> 100J
Answer: (a).100J
Question 95. When do we get maximum energy from a set of capacitors?
  1.    When they are connected in parallel
  2.    When they are connected in series
  3.    Both in series and parallel
  4.    Insufficient information provided
 Discuss Question
Answer: Option A. -> When they are connected in parallel
Answer: (a).When they are connected in parallel
Question 96. Work done in charging a capacitor is ____________
  1.    QV
  2.    1⁄2QV
  3.    2QV
  4.    QV²
 Discuss Question
Answer: Option B. -> 1⁄2QV
Answer: (b).1⁄2QV
Question 97. If the charge stored in a capacitor is 4C and the value of capacitance is 2F, calculate the energy stored in it.
  1.    2J
  2.    4J
  3.    8J
  4.    16J
 Discuss Question
Answer: Option B. -> 4J
Answer: (b).4J
Question 98. In which of the following mediums, will the force of attraction between the plates of a capacitor be greater?
  1.    Air
  2.    Water
  3.    Does not depend on the medium
  4.    Cannot be determined
 Discuss Question
Answer: Option B. -> Water
Answer: (b).Water
Question 99. A metal parallel plate capacitor has 100mm diameter and the distance between the plates is ‘a’ mm. The capacitor is placed in air. Force on each plate is 0.035N and the potential difference between the plates is 1kV. Find ‘a’.
  1.    1m
  2.    1cm
  3.    10cm
  4.    1mm
 Discuss Question
Answer: Option D. -> 1mm
Answer: (d).1mm
Question 100. A metal parallel plate capacitor has 100mm diameter and the distance between the plates is 1mm. The capacitor is placed in air. Calculate the force on each plate if the potential difference between the plates is 1kV.
  1.    350N
  2.    0.035kN
  3.    0.035N
  4.    3.35kN
 Discuss Question
Answer: Option C. -> 0.035N
Answer: (c).0.035N

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