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