Electrostatics Mcqs - Set 6

1)   If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________?

a. charged
b. short-circuited
c. lossy
d. satisfactory
Answer  Explanation 

ANSWER: short-circuited

Explanation:
No explanation is available for this question!


2)   The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?

a. CIR
b. 1/RC
c. RC
d. RIC
Answer  Explanation 

ANSWER: RC

Explanation:
No explanation is available for this question!


3)   Mica capacitors are characterized by all of the following except___________?

a. stable operation
b. accurate value
c. low leakage reactance
d. low losses
Answer  Explanation 

ANSWER: low leakage reactance

Explanation:
No explanation is available for this question!


4)   An uncharged conductor is placed near a charged conductor, then_____________?

a. the uncharged conductor gets charged by conduction
b. the uncharged conductor gets charged by induction and then attracted towards the charging body
c. the uncharged conductor is attracted first and then charged by induction
d. it remains as such
Answer  Explanation 

ANSWER: the uncharged conductor gets charged by induction and then attracted towards the charging body

Explanation:
No explanation is available for this question!


5)   Paper condenser is___________?

a. always polarised
b. usually of fixed value
c. electrolytic condenser
d. a variable condenser
Answer  Explanation 

ANSWER: usually of fixed value

Explanation:
No explanation is available for this question!


6)   Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ?

a. Aluminium foil capacitor
b. Mica capacitor
c. Ceramic capacitor
d. Paper capacitor
Answer  Explanation 

ANSWER: Ceramic capacitor

Explanation:
No explanation is available for this question!


7)   The presence of an uncharged conductor near a charged one increases the__________?

a. charge of the charged conductor
b. capacity of the charged conductor
c. potential of the charged conductor
d. all of the above
Answer  Explanation 

ANSWER: capacity of the charged conductor

Explanation:
No explanation is available for this question!


8)   Which of the following statements is correct ?

a. Mica capacitors are available in capacitance values of 5 to 20 uF
b. Air capapitors have a black band to indicate the outside foil
c. Electrolytic capacitors must be connected in correct polarity
d. Ceramic capacitors must be connected in correct polarity
Answer  Explanation 

ANSWER: Electrolytic capacitors must be connected in correct polarity

Explanation:
No explanation is available for this question!


9)   For a good 0.05 uF capacitor ohmmeter reading should___________?

a. show low resistance momentarily and back off to a very high resistance
b. show high resistance momentarily and then a very low resistance
c. go quickly to 50 ohm approximately and remain there
d. not move at all
Answer  Explanation 

ANSWER: show low resistance momentarily and back off to a very high resistance

Explanation:
No explanation is available for this question!


10)   The ohmmeter reading for a short circuited capacitor is____________?

a. infinity
b. few kilo ohms
c. few megohms
d. zero
Answer  Explanation 

ANSWER: zero

Explanation:
No explanation is available for this question!


11)   An electrolytic capacitor is generally made to provide__________?

a. low capacitance
b. fixed capacitance
c. variable capacitance
d. large value of capacitance
Answer  Explanation 

ANSWER: large value of capacitance

Explanation:
No explanation is available for this question!


12)   A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?

a. 5 times smaller than before
b. 5 times greater than before
c. 10 times greater than before
d. 25 times larger than before
Answer  Explanation 

ANSWER: 25 times larger than before

Explanation:
No explanation is available for this question!


13)   A condenser suitable for D.C. only is________?

a. metallic plate variable gang condenser
b. metallic paper capacitor
c. oil impregrated paper condenser
d. poled aluminium electrolytic condenser
Answer  Explanation 

ANSWER: poled aluminium electrolytic condenser

Explanation:
No explanation is available for this question!


14)   Which of the following capacitor is preferred in case of single phase motor ?

a. Mica capacitor
b. Paper capacitor
c. Electrolytic capacitor
d. Ceramic capacitor
Answer  Explanation 

ANSWER: Electrolytic capacitor

Explanation:
No explanation is available for this question!


15)   When a dielectric is placed in an electric field the field strength____________?

a. decreases
b. increases
c. reduces to zero
d. remain unchanged
Answer  Explanation 

ANSWER: decreases

Explanation:
No explanation is available for this question!


16)   Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________?

a. milli-coulomb
b. micro-coulomb
c. pico-coulomb
d. coulomb
Answer  Explanation 

ANSWER: micro-coulomb

Explanation:
No explanation is available for this question!


17)   If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?

a. move out of the field of influence of the two charges
b. remain in stable equilibrium
c. not be in equilibrium
d. be in unstable equilibrium
Answer  Explanation 

ANSWER: remain in stable equilibrium

Explanation:
No explanation is available for this question!


18)   Which of the following capacitors preferred for high frequency circuits ?

a. Air capacitor
b. Electrolytic capacitor
c. Mica capacitor
d. none of the above
Answer  Explanation 

ANSWER: Mica capacitor

Explanation:
No explanation is available for this question!


19)   In order to remove static electricity from machinery___________?

a. construct insulated cabins
b. insulate the machinery
c. ground the framework
d. humidify the surroundings
Answer  Explanation 

ANSWER: ground the framework

Explanation:
No explanation is available for this question!


20)   A region around a stationary electric charge has__________?

a. an electric field
b. a magnetic field
c. both A. and (b)
d. none of the above
Answer  Explanation 

ANSWER: an electric field

Explanation:
No explanation is available for this question!