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MCQs

Total Questions : 441 | Page 3 of 45 pages
Question 21. A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is
  1.    0.2 s
  2.    0.4 s
  3.    0.6 s
  4.    0.8 s
 Discuss Question
Answer: Option D. -> 0.8 s
Question 22. Electric intensity at any point in an electric field is equal to the at that point.
  1.    electric flux
  2.    magnetic flux density
  3.    potential gradient
  4.    none of the above
 Discuss Question
Answer: Option C. -> potential gradient
Question 23. The dielectric constant (relative permittivity) of glass is given by
  1.    0.1 to 0.4
  2.    0.5 to 1.0
  3.    2.0 to 4.0
  4.    5 to 100
 Discuss Question
Answer: Option D. -> 5 to 100
Question 24. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is
  1.    100 kV/m
  2.    10 kV/m
  3.    5 kV/m
  4.    2 kV/m
 Discuss Question
Answer: Option A. -> 100 kV/m
Question 25. 1 volt/meter is same as
  1.    1 meter/coulomb
  2.    1 newton/meter
  3.    1 newton/coulomb
  4.    1 joule/coulomb
 Discuss Question
Answer: Option C. -> 1 newton/coulomb
Question 26. When the dielectric is homogeneous,the potential gradient is
  1.    uniform
  2.    non-uniform
  3.    zero
  4.    any of the above
 Discuss Question
Answer: Option A. -> uniform
Question 27. A field line and an equipotential surface are
  1.    always parallel
  2.    always at 90°
  3.    inclined at any angle 0
  4.    none of the above
 Discuss Question
Answer: Option B. -> always at 90°
Question 28. Paper condenser is
  1.    always polarised
  2.    usually of fixed value
  3.    electrolytic condenser
  4.    a variable condenser
 Discuss Question
Answer: Option B. -> usually of fixed value
Question 29. The direction of electric field due +0 positive charge is .
  1.    away from the charge
  2.    towards the charge
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option A. -> away from the charge
Question 30. The capacitance of a capacitor is not affected by
  1.    distance between plates
  2.    area of plates
  3.    thickness of plates
  4.    all of the above
 Discuss Question
Answer: Option C. -> thickness of plates

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