Electrolysis & Storage of Batteries Mcqs - Set 6

1)   Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials

a. passive
b. active
c. redundant
d. inert
Answer  Explanation 

ANSWER: active

Explanation:
No explanation is available for this question!


2)   During the charging and discharging of a nickel-iron cell____________?

a. corrosive fumes are produced
b. water is neither formed nor absorbed
c. nickel hydroxide remains unsplit
d. its e.m.f. remains constant
Answer  Explanation 

ANSWER: water is neither formed nor absorbed

Explanation:
No explanation is available for this question!


3)   A dead storage battery can be revived by___________?

a. adding distilled water
b. adding so-called battery restorer
c. a dose of H2SO4
d. none of the above
Answer  Explanation 

ANSWER: none of the above

Explanation:
No explanation is available for this question!


4)   Five 2 V cells are connected in parallel. The output voltage is__________?

a. 1 V
b. 1.5 V
c. 1.75 V
d. 2 V
Answer  Explanation 

ANSWER: 2 V

Explanation:
No explanation is available for this question!


5)   As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?

a. reducing time of charging
b. increasing cell capacity
c. both (A) and (B)
d. avoiding excessive gassing
Answer  Explanation 

ANSWER: both (A) and (B)

Explanation:
No explanation is available for this question!


6)   The capacity of a battery is expressed in terms of____________?

a. current rating
b. voltage rating
c. ampere-hour rating
d. none of the above
Answer  Explanation 

ANSWER: ampere-hour rating

Explanation:
No explanation is available for this question!


7)   Cells are connected in series in order to_____________?

a. increase the voltage rating
b. increase the current rating
c. increase the life of the cells
d. none of the above
Answer  Explanation 

ANSWER: increase the voltage rating

Explanation:
No explanation is available for this question!


8)   The best indication about the state of charge on a lead-acid battery is given by____________?

a. output voltage
b. temperature of electrolyte
c. specific gravity of electrolyte
d. none of the above
Answer  Explanation 

ANSWER: specific gravity of electrolyte

Explanation:
No explanation is available for this question!


9)   The output voltage of a charger is__________?

a. less than the battery voltage
b. higher than the battery voltage
c. the same as the battery voltage
d. none of the above
Answer  Explanation 

ANSWER: higher than the battery voltage

Explanation:
No explanation is available for this question!


10)   The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is____________?

a. just one
b. always greater than one
c. always less than one
d. none of the above
Answer  Explanation 

ANSWER: always greater than one

Explanation:
No explanation is available for this question!


11)   The storage battery generally used in electric power station is__________?

a. nickel-cadmium battery
b. zinc-carbon battery
c. lead-acid battery
d. none of the above
Answer  Explanation 

ANSWER: lead-acid battery

Explanation:
No explanation is available for this question!


12)   During the charging of a lead-acid cell__________?

a. its voltage increases
b. it gives out energy
c. its cathode becomes dark chocolate brown in colour
d. specific gravity of H2SO4 decreases
Answer  Explanation 

ANSWER: its voltage increases

Explanation:
No explanation is available for this question!


13)   The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?

a. lead and lead peroxide
b. lead sulphate and lead
c. lead peroxide and lead
d. none of the above
Answer  Explanation 

ANSWER: lead peroxide and lead

Explanation:
No explanation is available for this question!


14)   The capacity of a lead-acid cell does not depend on its___________?

a. temperature
b. rate of charge
c. rate of discharge
d. quantity of active material
Answer  Explanation 

ANSWER: rate of charge

Explanation:
No explanation is available for this question!


15)   The charge required to liberate one gram equivalent of any substance is known as _________ constant

a. time
b. Faraday’s
c. Boltzman
Answer  Explanation 

ANSWER: Faraday’s

Explanation:
No explanation is available for this question!


16)   When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?

a. dark grey
b. brown
c. dark brown
d. none of above
Answer  Explanation 

ANSWER: dark brown

Explanation:
No explanation is available for this question!


17)   The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?

a. Newton’s law
b. Faraday’s law of electromagnetic
c. Faraday’s law of electrolysis
d. Gauss’s law
Answer  Explanation 

ANSWER: Faraday’s law of electrolysis

Explanation:
No explanation is available for this question!


18)   During charging the specific gravity of the electrolyte of a lead-acid battery

a. increases
b. decreases
c. remains the same
d. becomes zero
Answer  Explanation 

ANSWER: increases

Explanation:
No explanation is available for this question!


19)   The active materials of a nickel-iron battery are___________?

a. nickel hydroxide
b. powdered iron and its oxide
c. 21% solution of KOH
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!