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CH-14 CLASS 8

Total questions: 36

Worksheet time: 18mins

Name
Class
Date
1.

Which of the following metals is used in electroplating to make objects appear shining?

a)

Iron

b)

Copper

c)

Chromium

d)

Aluminium

2.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the nearby pond.

c)

in the nearby cornfield.

d)

according to the disposal guidelines of the local authority.

3.
Which of the following statements is incorrect about the conductivity of water?
a)
Rain water is a good conductor of electricity.
b)
On addition of table salt, water conducts electricity.
c)
On addition of lemon juice, water conducts electricity.
d)
Water becomes a good conductor of electricity when heated.
4.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
5.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

6.

What kind of process don't go when observe the chemical effect of electric current

a)

Formation of gas bubbles at the electrodes

b)

Deposit of metal on the electrodes

c)

Electric motor begin to move

d)

Change in colour of the solution

7.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

8.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

9.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

10.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

11.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

12.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

13.

Small amount of a mineral salt present naturally in water makes it a______________ of electricity.

a)

insulator

b)

conductor

c)

both a and b

d)

none of these

14.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

15.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

16.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

17.

one of the following is not used for electroplating metal articles. the one is -

a)

nickel

b)

chromium

c)

sodium

d)

silver

18.

The glowing of filament bulb is due to

a)

Chemical effect of current

b)

magnetic effect of current

c)

Physical effect of electric current

d)

Heating effect of electric current

19.

You perform an experiment taking similar bulbs and cells but two different solutions A and B. You find that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that

a)

higher current is flowing through the circuit in setup A

b)

higher current is flowing through the circuit in setup B

c)

equal current is flowing through both the circuits

d)

No conclusion

20.

The conductors among the following are

a)

Hydrochloric acid

b)

Sugar solution

c)

Vinegar

d)

Salt water

21.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

22.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

23.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

24.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

25.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

26.

there are __________ types of effects of electric current

a)

5

b)

4

c)

3

d)

2

27.

Tick the chemical effect of elecric current

a)

boiling

b)

motion

c)

electro shock

d)

Electroplating

28.

Who discovered chemical effect of elecric current?

a)

Thomas Edison

b)

Joule-Lenz

c)

Michael Faraday

d)

James Watt

29.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the nearby pond.

c)

in the nearby cornfield.

d)

according to the disposal guidelines of the local authority.

30.

Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

a)

in the nearby river.

b)

in the nearby pond.

c)

in the nearby cornfield.

d)

according to the disposal guidelines of the local authority.

31.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

32.

Which of the following solutions will not make the bulb in Fig 14.2 glow?

(a)

(b)

(c)

(d)

a)

sodium chlorides

b)

copper sulphate

c)

silver nitrate

d)

sugar solution in diluted water

33.
Which of the following statements is incorrect about the conductivity of water?
a)
Rain water is a good conductor of electricity.
b)
On addition of table salt, water conducts electricity.
c)
On addition of lemon juice, water conducts electricity.
d)
Water becomes a good conductor of electricity when heated.
34.
When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because
a)
of the heating effect of current
b)
of the chemical effect of current
c)
current produces magnetic field around the electrodes
d)
current always produces air bubbles when passed through a liquid
35.

the phenomenon of decomposition of an electrolyte when electricity is passed through is known as

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

36.

Which one is the polluting waste generated by electroplating factories?

a)

Used up electrodes

b)

Electrolytes

c)

Corroded Metals

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