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MCQs on Dielectrics

MCQs on Dielectrics

Q1: Which among the following is a dielectric?

  1. Copper
  2. Aluminium
  3. Plastic
  4. Ceramic

Answer: (d) Ceramic

Q2: How can a dielectric be converted to a conductor?

  1. Compression
  2. Heating
  3. Expanding
  4. Freezing

Answer:(b) Heating

Q3: Which of the following statements is true for a dielectric?

  1. Dielectrics are superconductors at high temperature
  2. Dielectrics are superconductors at low temperature
  3. The cannot become superconductors
  4. They have very less breakdown voltage

Answer:(b) Dielectrics are superconductors at low temperature

Q4: Dielectric materials do not have

  1. Free electrons
  2. Bound charge
  3. Proton
  4. neutron

Answer: (a) Free electrons

Q5: Dielectric materials are basically

  1. Insulators
  2. Semiconductors
  3. Superconductors
  4. conductors

Answer: (a) insulators

Q6: Find the dielectric constant for material with electric susceptibility of 5

  1. 4
  2. 6
  3. 7
  4. 3

Answer: (b) 6

Q7: When the air in a capacitor is replaced by a medium of dielectric constant K, the capacity

  1. Deceases K times
  2. Increases K times
  3. The K2 times
  4. Remains constant

Answer: (b) Increases K times

Q8: The dielectric constant cannot be

  1. Infinity
  2. 5
  3. 6
  4. 7

Answer: (a) Infinity

Q9: A capacitor of capacity C=10μF is connected to a constant voltage battery of 12 V. Now space between plates is filled with a liquid of dielectric constant 5. The charge that flows now from the battery to the capacitor is

  1. 120 μC
  2. 699 μC
  3. 480 μC
  4. 24 μC

Answer: (c) 480 μC

Q10: The capacitance of a parallel plate capacitor is C. If a dielectric slab of thickness equal to one-fourth of the plate separation and dielectric constant K is inserted between the plates, then the capacitance becomes

  1. KC/2(K+1)
  2. 2KC/K+1
  3. 5KC/4K+1
  4. 4KC/3K+1

Answer: (d) 4KC/3K+1


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