1. For closer tolerances which of the lowing capacitors is usually preferred ?

Paper capacitor

Mica capacitor

Ceramic disc capacitor

None of the above

Answer: Mica capacitor

Explanation:


2. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?

Paper capacitor

Ceramic capacitor

Electrolytic capacitor

Any of the above

Answer: Electrolytic capacitor

Explanation:


3. A gang condenser is a ?

polarised capacitor

variable capacitor

ceramic capacitor

none of the above

Answer: variable capacitor

Explanation:


4. Capacitance increases with ?

increase in plate area and decrease in distance between the plates

increase in plate area and distance between the plates

decrease in plate area and value of applied voltage

reduction in plate area and distance between the plates

Answer: increase in plate area and decrease in distance between the plates

Explanation:


5. Which of the following statement is true ?

The current in the discharging capacitor grows linearly

The current in the discharging capacitor grows exponentially

The current in the discharging capacitor decays exponentially

The current in the discharging capacitor decreases constantly

Answer: The current in the discharging capacitor grows exponentially

Explanation:


6. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the ?

voltage across the plates increases

voltage across the plates decreases

charge on the capacitor decreases

charge on the capacitor increases

Answer: voltage across the plates decreases

Explanation:


7. A dielectric material must be ?

resistor

insulator

good conductor

semiconductor

Answer: insulator

Explanation:


8. For making a capacitor, it is better to select a dielectric having ?

low permittivity

high permittivity

permittivity same as that of air

permittivity slightly more than that of air

Answer: high permittivity

Explanation:


9. Which of the following capacitors will have the least value of breakdown voltage ?

Mica

Paper

Ceramic

Electrolytic

Answer: Electrolytic

Explanation:


10. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as ...... ?

photoelectric effect

chemical effect

magnetic effect

induction

Answer: induction

Explanation: