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Chemical Effects of Electric Current

A Cathode is a

a) Negative electrode.
b) Positive electrode.
c) Conducting liquid.
d) Connecteing rod.

✔Answer

✔Solution

Correct Answer Is : Negative electrode.

Solution Is : An electrode connected to the negative terminal of a battery is taken as the negative electrode(cathode).

If two ends of a wire are dipped in distilled water, the compass needle brought near the circuit

a) Would keep moving in anticlockwise direction continuously.
b) Would keep moving in clockwise direction continuously.
c) Would remain still.
d) Would show deflection.

✔Answer

✔Solution

Correct Answer Is : Would remain still.

Solution Is : Distilled water is non-conducting, as it is free from any dissolved salts and impurities.

Battery is having:

a) Two or more cells connected to each other in any manner.
b) Positive terminal of one cell is connected to the positive terminal of the next cell.
c) Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.
d) Only one cell.

✔Answer

✔Solution

Correct Answer Is : Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.

Solution Is : Battery is having two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.

Anode is a

a) Positive electrode.
b) Negative electrode.
c) Conducting liquid.
d) Connecteing rod.

✔Answer

✔Solution

Correct Answer Is : Positive electrode.

Solution Is : An electrode connected to the positive terminal of the battery is taken as the positive electrode(anode).

During electrolysis, copper sulphate solution dissociates into

a) Copper metal only.
b) Copper ions only.
c) Sulphate ions only.
d) Copper ions and sulphate ions.

✔Answer

✔Solution

Correct Answer Is : Copper ions and sulphate ions.

Solution Is : When electric current passes through copper suplhate solution, it dissociates into positive cations (copper ions) and negative anions (sulphate ions).

Switch can be connected

a) To the positive terminal of the battery only.
b) Any where in between the circuit elements within the circuit.
c) To the negative terminal of the battery only.
d) First to the positive terminal and then to the negative terminal of the battery.

✔Answer

✔Solution

Correct Answer Is : Any where in between the circuit elements within the circuit.

Solution Is : Switch in the `ON` mode makes an electrical circuit closed and continuous such that electric current can flow through it.Hence, it is used only to complete the circuit and so, can be used any where in between the circuit elements in the circuit.

The circuit is discontinuous

a) When the switch is in `OFF` mode.
b) When the switch is in `ON` mode.
c) Without any source of current.
d) Without a bulb.

✔Answer

✔Solution

Correct Answer Is : When the switch is in `OFF` mode.

Solution Is : When the switch is turned OFF, the circuit breaks at that point and becomes incomplete.It is said to be open and the current does not flow in the circuit.

The weak current flowing in a circuit can be detected by a

a) LED
b) Battery.
c) Bulb.
d) Bar of metal.

✔Answer

✔Solution

Correct Answer Is : LED

Solution Is : The weak current flowing in a circuit does heat the filament to an extent, so as to glow the bulb.In such a case, we use a LED instead of an electric bulb, as it can glow even at very less supply of electricity and it consumes less current.

Electric fuse contains wire that

a) Can melt on passage of electric current of low voltage.
b) Cannot melt.
c) Can melt only on passage of electric current of high voltage.
d) Electric fuse does not contain wire.

✔Answer

✔Solution

Correct Answer Is : Can melt only on passage of electric current of high voltage.

Solution Is : An electric fuse is used to prevent damages to electric circuits and fires.It contains a wire made up of a material having low melting point so that in case of passage of high voltage current, the wire will melt and break the circuit; thus, preventing the damage to electrical appliances and possible wires.

In all primary cells chemical energy is changed into

a) Potential
b) Kinetic
c) Electrical
d) Light

✔Answer

✔Solution

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Class 8 Science Study Material

Chemical Effects of Electric Current

A Cathode is a

Correct Answer Is : Negative electrode.

Solution Is : An electrode connected to the negative terminal of a battery is taken as the negative electrode(cathode).

If two ends of a wire are dipped in distilled water, the compass needle brought near the circuit

Correct Answer Is : Would remain still.

Solution Is : Distilled water is non-conducting, as it is free from any dissolved salts and impurities.

Battery is having:

Correct Answer Is : Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.

Solution Is : Battery is having two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next.

Anode is a

Correct Answer Is : Positive electrode.

Solution Is : An electrode connected to the positive terminal of the battery is taken as the positive electrode(anode).

During electrolysis, copper sulphate solution dissociates into

Correct Answer Is : Copper ions and sulphate ions.

Solution Is : When electric current passes through copper suplhate solution, it dissociates into positive cations (copper ions) and negative anions (sulphate ions).

Switch can be connected

Correct Answer Is : Any where in between the circuit elements within the circuit.

Solution Is : Switch in the `ON` mode makes an electrical circuit closed and continuous such that electric current can flow through it.Hence, it is used only to complete the circuit and so, can be used any where in between the circuit elements in the circuit.

The circuit is discontinuous

Correct Answer Is : When the switch is in `OFF` mode.

Solution Is : When the switch is turned OFF, the circuit breaks at that point and becomes incomplete.It is said to be open and the current does not flow in the circuit.

The weak current flowing in a circuit can be detected by a

Correct Answer Is : LED

Solution Is : The weak current flowing in a circuit does heat the filament to an extent, so as to glow the bulb.In such a case, we use a LED instead of an electric bulb, as it can glow even at very less supply of electricity and it consumes less current.

Electric fuse contains wire that

Correct Answer Is : Can melt only on passage of electric current of high voltage.

In all primary cells chemical energy is changed into

Correct Answer Is : Electrical

Solution Is : All cells generate electricity.

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