1. Which of the following has lower sp. gravity ?

Dilute H2S04

Concentrated H2S04

Water

Any of the above

Answer: Water

Explanation:


2. Charging of sulphated battery produces ...... heat ?

no

very little

less

more

Answer: more

Explanation:


3. Two batteries having unequal e.m.f. ?

can be connected in series only

cannot be connected in series

cannot be connected in parallel

may be connected in series or in parallel

Answer: can be connected in series only

Explanation:


4. In a lead-acid battery the energy is stored in the form of ?

charged ions

chemical energy

electrostatic energy

electromagnetic energy

Answer: chemical energy

Explanation:


5. A fuel cell converts ...... energy into electrical energy ?

mechanical

magnetic

solar

chemical

Answer: chemical

Explanation:


6. Higher current density is usually recommended for ?

tin plating

cadmium plating

bronze plating

chromium plating

Answer: chromium plating

Explanation:


7. The life of a lead-acid battery is expected to be ?

two months

one year

two to five years

ten to fifteen years

Answer: two to five years

Explanation:


8. Dry cell is modification of ?

Deniell cell

Leclanche cell

Lead-acid cell

Edison cell

Answer: Leclanche cell

Explanation:


9. Highest purity copper is obtained by ?

electroplating

roasting

smelting

any of the above processes

Answer: electroplating

Explanation:


10. Petroleum jelly is applied to the electrical connections to the lead-acid battery ?

prevent local heating

prevent short-circuiting

reduce path resistance

prevent corrosion

Answer: prevent corrosion

Explanation: