300+ TOP MCQs on Ondielectrics and Answers

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MCQs on Ondielectrics :

1. Which among the following is a dielectric?
(A) Copper
(B) Aluminium
(C) Plastic
(D) Ceramic

Answer

Answer: (D) Ceramic

2. How can a dielectric be converted to a conductor?
(A) Compression
(B) Heating
(C) Expanding
(D) Freezing

Answer

Answer: (B) Heating

3. Which of the following statements is true for a dielectric?
(A) Dielectrics are superconductors at high temperature
(B) Dielectrics are superconductors at low temperature
(C) The cannot become superconductors
(D) They have very less breakdown voltage

Answer

Answer: (B) Dielectrics are superconductors at low temperature

4. Dielectric materials do not have
(A) Free electrons
(B) Bound charge
(C) Proton
(D) neutron

Answer

Answer: (A) Free electrons

5. Dielectric materials are basically
(A) Insulators
(B) Semiconductors
(C) Superconductors
(D) conductors

Answer

Answer: (A) insulators

6. Find the dielectric constant for material with electric susceptibility of 5
(A) 4
(B) 6
(C) 7
(D) 3

Answer

Answer: (B) 6

7. When the air in a capacitor is replaced by a medium of dielectric constant K, the capacity
(A) Deceases K times
(B) Increases K times
(C) The K² times
(D) Remains constant

Answer

Answer: (B) Increases K times

8. The dielectric constant cannot be
(A) Infinity
(B) 5
(C) 6
(D) 7

Answer

Answer: (A) Infinity

9. 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
(A) 120 μC
(B) 699 μC
(C) 480 μC
(D) 24 μC

Answer

Answer: (C) 480 μC

10. 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
(A) KC/2(K+1)
(B) 2KC/K+1
(C) 5KC/4K+1
(D) 4KC/3K+1

Answer

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