MCQs on Dielectrics
Q1: Which among the following is a dielectric?
a) Copper
b) Aluminium
c) Plastic
d) Ceramic
Answer: (d) Ceramic
Q2: How can a dielectric be converted to a conductor?
a) Compression
b) Heating
c) Expanding
d) Freezing
Answer: (b) Heating
Q3: 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: (b) Dielectrics are superconductors at low temperature
Q4: Dielectric materials do not have
a) Free electrons
b) Bound charge
c) Proton
d) neutron
Answer: (a) Free electrons
Q5: Dielectric materials are basically
a) Insulators
b) Semiconductors
c) Superconductors
d) conductors
Answer: (a) insulators
Q6: Find the dielectric constant for material with electric susceptibility of 5
a) 4
b) 6
c) 7
d) 3
Answer: (b) 6
Q7: 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: (b) Increases K times
Q8: The dielectric constant cannot be
a) Infinity
b) 5
c) 6
d) 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
a) 120 μC
b) 699 μC
c) 480 μC
d) 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
a) KC/2(K+1)
b) 2KC/K+1
c) 5KC/4K+1
d) 4KC/3K+1
Answer: (d) 4KC/3K+1
