961. For a cell to work, which of the following condition(s) become necessary ___________?
A. Two electrodes of different meta’s should be inserted in the electrolyte, not touching each other
B. Electrolyte must chemically react with one of the electrodes
C. Electrolyte liquid or paste should be conducting
D. All above three conditions are necessary
962. Which of the following primary cells has the highest voltage___________ ?
A. Manganese-alkaline
B. Carbon-zinc
C. Lithium
D. Mercury
963. Hydrogen evolved during charging produces explosive mixture when it is more than___________?
A. 2%
B. 4%
C. 6%
D. 8%
964. In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
A. to reduce evaporation of water from electrolyte
B. to exclude dirt and foreign matter from the electrolyte
C. to discharge both of the above functions
D. to discharge none of the above functions
965. Which of the following battery is used for air-craft _____________?
A. Lead-acid battery
B. Nickel-iron battery
C. Dry cell battery
D. Silver oxide battery
966. Which of the following has lower specific gravity V__________?
A. Dilute H2S04
B. Concentrated H2SO4
C. Water
D. Any of the above
967. When two batteries are connected in parallel, it should be ensured that___________?
A. they have same e.m.f.
B. they have same make
C. they have same ampere-hour capacity
D. they have identical internal resistance
968. Which of the following cell has a. reversible chemical reaction ___________?
A. Lead-acid
B. Mercury oxide
C. Carbon-zinc
D. Silver-oxide
969. Petroleum jelly is applied to the electrical connections to the lead-acid battery___________?
A. prevent local heating
B. prevent short-circuiting
C. reduce path resistance
D. prevent corrosion
970. The common impurity in the electrolyte of lead-acid battery is_____________?
A. chlorine
B. dust particles
C. lead crystals
D. iron
NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU