electrical

Electrolysis and Storage Batteries MCQ With Answers Page - 5

1.

The open-circuit e.m.f of a storage cell is 2.2 V. the terminal volatge measured when current Is 6 A is found to be 1.98 V. the internal resistance of the cell is

Answer/ Hint      

Answer : B

Explanation :

2.

A 30 V source with a central resistance of 1 ohm is connected across a wire wound resister. Maximum power will be dissipated in the resistor when its R is

Answer/ Hint      

Answer : A

Explanation :

3.

When the internal resistance of a cell is large compared to the external resistance in the circuit then high current can flow through the external resistance by grouping the cells

Answer/ Hint      

Answer : A

Explanation :

4.

Electrolyte for silver plating is

Answer/ Hint      

Answer : C

Explanation :

5.

For cadmium plating electrolyte used is

Answer/ Hint      

Answer : C

Explanation :

6.

Electric supply for electroplating should be

Answer/ Hint      

Answer : C

Explanation :

7.

Which of the following is invariably seen in an electroplating plant?

Answer/ Hint      

Answer : B

Explanation :

8.

Which law (S) find application in electrolysis?

Answer/ Hint      

Answer : B

Explanation :

9.

Electrochemical equivalent is usually expressed in

Answer/ Hint      

Answer : A

Explanation :

10.

Silver coating is provided for

Answer/ Hint      

Answer : D

Explanation :

11.

Highest purity copper is obtained by

Answer/ Hint      

Answer : A

Explanation :

12.

In electroplating, the character of a metal deposited is affected by

Answer/ Hint      

Answer : D

Explanation :

13.

In electroplating the current efficiency is usually

Answer/ Hint      

Answer : D

Explanation :

14.

Coating generally recommended for hard surfacing is

Answer/ Hint      

Answer : C

Explanation :

15.

Coating usually recommended for electrical contacts is that of

Answer/ Hint      

Answer : D

Explanation :

16.

Galvanising is coating of

Answer/ Hint      

Answer : C

Explanation :

17.

The plates of lead-acid storage battery are most likely to be short-circuited if

Answer/ Hint      

Answer : A

Explanation :

18.

For zinc plating optimum temperature is

Answer/ Hint      

Answer : C

Explanation :

19.

The electrode for a battery must be

Answer/ Hint      

Answer : C

Explanation :

20.

A cell which is used as a voltage reference source for instrument calibration is

Answer/ Hint      

Answer : C

Explanation :

21.

121 cells, each of e.m.f 0.121 V and internal resistance 0.121 Ω are connected in parallel. The e.m.f of parallel combination will be

Answer/ Hint      

Answer : B

Explanation :

22.

Higher current density is usually recommended for

Answer/ Hint      

Answer : D

Explanation :

23.

Which of the following substance when added to electrolyte promote smooth deposition?

Answer/ Hint      

Answer : D

Explanation :

24.

A fuel cell covert ……… energy into electrical energy

Answer/ Hint      

Answer : D

Explanation :

25.

The output voltage of a silver oxide cell is

Answer/ Hint      

Answer : C

Explanation :

26.

The ampere-hour (A.H) capacity of a battery used on cars is

Answer/ Hint      

Answer : D

Explanation :

27.

The value of sp. Gravity of acid when a lead-acid battery is fully charged is

Answer/ Hint      

Answer : D

Explanation :

28.

The e.m.f of a storage battery depends upon

Answer/ Hint      

Answer : A

Explanation :

29.

When the n cells each of e.m.f E volts and internal resistance r ohms are connected in parallel the strength of current I is given by

Answer/ Hint      

Answer : A

Explanation :

30.

One ampere-hour charge is equivalent to

Answer/ Hint      

Answer : C

Explanation :

31.

The energy in a lead-acid battery is stored in the form of

Answer/ Hint      

Answer : D

Explanation :

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Electrolysis and Storage Batteries MCQ With Answers Page - 5