MCQs on Dielectrics
MCQs on Dielectrics
Q1: Which among the following is a dielectric?
- Copper
- Aluminium
- Plastic
- Ceramic
Answer: (d) Ceramic
Q2: How can a dielectric be converted to a conductor?
- Compression
- Heating
- Expanding
- Freezing
Answer:(b) Heating
Q3: Which of the following statements is true for a dielectric?
- Dielectrics are superconductors at high temperature
- Dielectrics are superconductors at low temperature
- The cannot become superconductors
- They have very less breakdown voltage
Answer:(b) Dielectrics are superconductors at low temperature
Q4: Dielectric materials do not have
- Free electrons
- Bound charge
- Proton
- neutron
Answer: (a) Free electrons
Q5: Dielectric materials are basically
- Insulators
- Semiconductors
- Superconductors
- conductors
Answer: (a) insulators
Q6: Find the dielectric constant for material with electric susceptibility of 5
- 4
- 6
- 7
- 3
Answer: (b) 6
Q7: When the air in a capacitor is replaced by a medium of dielectric constant K, the capacity
- Deceases K times
- Increases K times
- The K2 times
- Remains constant
Answer: (b) Increases K times
Q8: The dielectric constant cannot be
- Infinity
- 5
- 6
- 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
- 120 μC
- 699 μC
- 480 μC
- 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
- KC/2(K+1)
- 2KC/K+1
- 5KC/4K+1
- 4KC/3K+1
Answer: (d) 4KC/3K+1
