Which of the following statements about the commonly used automobile battery are true?1. It is usually a lead-acid battery.2. It has six cells with a potential of 2V each.3. Its cells work as galvanic cells while discharging power.4. It cells work as electrolytic cells while recharging.Select the correct answer:

If the first two statements are true, the third statement is :
I. Battery X lasts longer than Battery Y.
II. Battery Y doesn't last as long as Battery Z.
III. Battery Z lasts longer than Battery X.

A

true

B

false

C

[C. uncertain

Consider the following statements.
1. Galvanic cell converts chemical energy into electrical energy.
2. In a galvanic cell, the electron flow from anode to cathode through the external circuit.
3. Galvanic cell converts metal from its elemental state to the combined state.
Which of the statement(s) given above is/are correct?

A

Only 1

B

Only 2

C

1 and 2

D

1, 2 and 3

Which of the following factors adversely affects the capacity of the leadacid battery ?

A

Temperature of surroundings

B

Specific gravity of electrolyte

C

Rate of discharge

D

All of the above

A three-phase full converter charges a battery from a three-phase supply of 230 V. The battery emf is 200 V and the internal resistance of the battery is 0.5 Ω. Find the value of the continuous current which is flowing through the battery if its terminal voltage is 210 V

A

10 A

B

20 A

C

0.5 A

D

25 A

If the concentration of Mg2+ is changed from 1.0 M to 0.1 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 2 and 3?

A

The voltage in both galvanic cells 2 and 3 will increase.

B

The voltage will decrease in both galvanic cells 2 and 3.

C

The voltage in galvanic cell 2 will increase and will decrease in galvanic cell 3.

D

The voltage in galvanic cell 3 will increase and will decrease in galvanic cell 2.

If the concentration of Ti2+ is changed from 1.0 M to 0.1 M in the galvanic cells above, what will happen to the observed cell voltages in galvanic cells 2 and 3?

A

The voltage in both galvanic cells 2 and 3 will increase.

B

The voltage will decrease in both galvanic cells 2 and 3.

C

The voltage in galvanic cell 2 will increase and will decrease in galvanic cell 3.

D

The voltage in galvanic cell 3 will increase and will decrease in galvanic cell 2.

The ampere-hour efficiency of a leadacid cell is normally between

A

20 to 30%

B

40 to 50%

C

60 to 70%

D

90 to 95%

Consider the following statements:
A person who is not a member of Parliament
1. Cannot be appointed as a Minister.
2. Can be appointed as a Minister for six months.
3. Can be appointed as a Minister for six months term renewable by another six months.
4. Can be appointed as a Minister beyond six months on his election to either House of Parliament.
Which of the statements given above is/are correct?

A

2 and 4

B

2, 3 and 4

C

1 only

D

2 and 3

Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

A

Has larger production capacity per unit cell

B

Consumes less power per ton of Cl₂ produced

C

Produces high purity (70%) caustic soda directly

D

All of the above

Which of the following conversion take place in the galvanic cell and electrolytic cell?

A

Chemical energy to electrical energy without power supply

B

Electrical energy to chemical energy without power supply

C

Mechanical energy to chemical energy without power supply

D

None of the mentioned

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