Conduction Currents in Capacitor MCQ [Free PDF] – Objective Question Answer for Conduction Currents in Capacitor Quiz

21. In a variable capacitor, capacitance can be varied by ______

A. Turning the rotatable plates in or out
B. Sliding the rotatable plates
C. Changing the plates
D. Changing the material of plates

Answer: A

As the plates are rotated, the area of the plates between which the field exists will vary. Capacitance depends on the area, hence as the area varies, the capacitance also varies.

 

22. The simplest kind of capacitor is ________

A. Ceramic capacitor
B. Electrolyte capacitor
C. Tuning capacitor
D. Paper capacitor

Answer: D

The paper capacitor consists of two strips of aluminum foil separated by sheets of waxed paper. This whole setup is rolled up into the form of a cylinder. Since the materials require for its construction are easily available, it is the simplest kind of capacitor.

 

23. Capacitor preferred when there is high frequency in the circuits is _______

A. Electrolyte capacitor
B. Mica capacitor
C. Air capacitor
D. Glass capacitor

Answer: B

Mica capacitors are preferred for high-frequency circuits because they have low ohmic losses and less reactance.

 

24. The type of capacitors used in communication transmitters are?

A. Electrolyte capacitor
B. Variable capacitor
C. Air capacitor
D. Glass capacitor

Answer: B

The variable capacitor is used to tune all the circuits to the same frequency i.e. resonance frequency so they are used in communication transmitters.

 

25. Which capacitors are relatively costly?

A. Electrolyte capacitor
B. Mica capacitor
C. Air capacitor
D. Glass capacitor

Answer: B

Mica capacitors are relatively expensive because it consists either of alternate layers of mica and metal foil clamped tightly together, or of thin films of silver on the two sides of a mica sheet. Silver is an expensive metal, hence mica capacitors are expensive.

 

26. ____________ capacitors usually have a colour code to find its value.

A. Electrolyte capacitor
B. Variable capacitor
C. Polyester capacitor
D. Glass capacitor

Answer: C

Polyester capacitors usually come with a color code because they are very small and their values cannot be printed on their body.

 

27. ______________ capacitors have a high leakage voltage.

A. Electrolyte capacitor
B. Variable capacitor
C. Air capacitor
D. Polyester capacitor

Answer: D

Polyester capacitors can operate at high voltages, that is, a few thousand volts and the leakage resistance is high, that is, usually 100 M.

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