1.
Which of the following is incorrect ?

2.
While preparing electrolyte for a lead-acid battery___________?

3.
The common impurity in the electrolyte of lead-acid battery is_____________?

4.
Petroleum jelly is applied to the electrical connections to the lead-acid battery___________?

5.
Which of the following cell has a. reversible chemical reaction ___________?

6.
When two batteries are connected in parallel, it should be ensured that___________?

7.
Which of the following has lower specific gravity V__________?

8.
Which of the following battery is used for air-craft _____________?

9.
In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?

10.
Hydrogen evolved during charging produces explosive mixture when it is more than___________?

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