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CHEMICAL EFFECTS OF ELECTRIC CURRENT

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

Which of these will conduct electricity

a)

tap water

b)

distilled water

2.

Conduction of electricity in liquids occurs through electrons.

a)

True

b)

False

3.

When a liquid conducts electricity, a process other than conduction also takes place. What process is this?

a)

electrolysis

b)

electrochemical reaction

c)

electroplating

d)

oxidation

4.

Electric current is the flow of particles with

a)

a negative charge.

b)

a positive charge.

c)

both positive and negative charges flowing opposite to each other.

d)

either positive or negative charge depending on the material.

5.

Which of the following is not a conductor of electricity?

a)

tap water

b)

salt water

c)

petrol

d)

lime juice

6.

An electrolyte is a

a)

solid that conducts electricity.

b)

liquid that conducts electricity and breaks up chemically in the process.

c)

liquid that does not conduct electricity.

d)

solid that does not conduct electricity.

7.

On passing electricity through copper sulphate solution.

a)

copper is formed at anode.

b)

copper is formed at cathode

c)

oxygen is formed at anode.

d)

hydrogen is formed at cathode.

8.

In which of these is current not conducted by electrons?

a)

copper

b)

aluminium

c)

tap water

d)

mercury

9.

A battery is used as a driving force in an electric circuit. True or false?

a)

True

b)

false

10.

which of these particles are responsible for the flow of electric current−electrons, protons or neutrons?

a)

electrons

b)

protons

c)

neutrons

11.

When electricity is passed through tap water, the gases __________ and __________ are evolved.

(a)  

12.

An electric current brings about chemical changes in most conducting (a)   (solids/liquids).

13.

Substances that conduct electricity are called (a)   .

14.

A cation has (a)   charge.

15.

Distilled water when mixed with salts becomes a (a)   conductor of electricity.

16.
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
17.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

18.

The electrode thats connected to the positive terminal of the battery is called a

a)

anode

b)

cathode

c)

elctrode

19.

An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

20.

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.

21.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

22.

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

a)

iron

b)

aluminium

c)

copper

d)

chromium

23.

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

24.

Tick the chemical effect of elecric current

a)

boiling

b)

motion

c)

electro shock

d)

Electroplating

25.
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.
26.
Which of the following liquid is not a good conductor of electricity?
a)
Orange juice
b)
Tap water
c)
Vinegar
d)
Honey
27.
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
28.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

29.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

30.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

31.

Which of these is plated on the iron to prevent it from chemically reacting with food?

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

32.

Out of the following, which metal is used to electroplate iron to make it shining and rust resistant?

a)

Gold

b)

Chromium

c)

Zinc

d)

Tin

33.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

34.

Chromium corrodes easily.

a)

True

b)

False

35.

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 corn field

c)

according to the disposal guidelines of the local authority.

d)

in the nearby pond

36.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

37.
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.
38.
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
39.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

40.

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

41.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts current

d)

all of above

42.

Flow of electron is called

a)

Electroplating

b)

Electric current

c)

Electrodes

d)

Electrolyte

43.

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

a)

conduction

b)

coating

c)

electrolysis

d)

electrorefining

44.

the electrode connected to the negative terminal of a battery is known as

a)

anode

b)

negative pole

c)

cathode

d)

electrolyte

45.

electrolyte that ionise completely to form free mobile ions in the solution is known as

a)

strong electrolytes

b)

weak electrolytes

c)

cathode

d)

anode

46.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

47.

which of the following is an application of electroplating.

a)

Electrorefining of metal

b)

extraction of metals from its ores

c)

to minimize the cost

d)

none of these

48.

the method of purification of metals by using electricity is known as

a)

electroplating

b)

electrorefining

c)

electrometal

d)

none of these

49.

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

a)

Iron

b)

Copper

c)

Chromium

d)

Aluminium

50.

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.

51.
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.
52.

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

53.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

54.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

55.

Sugar solution is a good conductor of electricity.

a)

True

b)

False

56.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

57.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

58.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

59.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

60.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

61.

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

a)

nickel

b)

chromium

c)

sodium

d)

silver

62.

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

63.

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

64.

The conductors among the following are

a)

Hydrochloric acid

b)

Sugar solution

c)

Vinegar

d)

Salt water

65.

Which one is the polluting waste generated by electroplating factories?

a)

Used up electrodes

b)

Electrolytes

c)

Corroded Metals

66.

When acidified water is electrolysed using carbon electrodes. What is produced at (+) and (-) electrodes.

a)

(+) - Oxygen; (-) - Hydrogen

b)

(+) - Oxygen; (-) - Carbon

c)

(+) - Hydrogen (-) - Oxygen

67.

Select the poor conductors of electricity

a)

Honey

b)

Plastic

c)

Vinegar

d)

Distilled Water

68.

We can electroplate plastic on iron.

a)

True

b)

False

69.

We can electroplate plastic on iron.

a)

True

b)

False

70.

To electroplate silver on Copper jewellery, the electrolyte that can be used is:

a)

Copper Sulphate

b)

Silver Nitrate

c)

Ammonium Chloride

d)

Sodium Chloride

71.

In a conducting liquid electricity is conducted with the help of :

a)

Proton

b)

Neutron

c)

Electron

d)

Ions

72.

During electrolysis the positively charged ions travel towards Cathode.

a)

True

b)

False

73.

During electroplating ________ (electrode) reduces in size and ________(electrode) increases in size.

(a)  

74.

Bicycle bells and wheel rims are electroplated with which metal?

a)

Tin

b)

Nickle

c)

Chromium

d)

Silver

75.

which of the following is/are conductor(s)?

a)

Metals

b)

Electrolytes

c)

Rainwater

d)

All of them

76.

Alloys of metals

a)

allow electric current to flow through them

b)

do not allow electric current to flow through them

c)

sometimes allow and sometimes do not allow electric current to flow through them

d)

None of these

77.

Choose insulator from the following:

a)

Distilled water

b)

Plastic

c)

Wood

d)

All of them

78.

Tin cans used for storing food are made by electroplating

a)

copper on iron

b)

iron on tin

c)

tin on zinc

d)

tin on iron

79.

While trying to put out fire in an electrical appliance, we should

a)

pour distilled water on it

b)

pour rain water on it

c)

pour tap water on it

d)

none of these

80.

Iron is coated with (a)   to protect it from corrosion.

81.

The article to be electroplated is made

a)

the anode

b)

the cathode

c)

either anode or cathode

d)

none of these

82.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

83.

Lets start with an easy one . A combination of 2 or more cells is known as

a)

an electric cell

b)

a battery

c)

a switch

d)

a bulb

84.

filament of a bulb is usually made up of

a)

nickel

b)

chromium

c)

cobalt

d)

tungsten

85.

When current is switched 'on' of a bulb it converts _______ energy into _______ energy.

a)

Electrical, heat

b)

Electrical, light

c)

Electrical, mechanical

d)

Electrical, sound

86.

Which is this type of circuit?

a)

Open circuit

b)

Closed circuit

c)

Both of these

d)

None of these

87.

Fuse works based on the

a)

heating effect of electric current

b)

magnetic effect of electric current

c)

Lighting effect of electric current

88.

heating effect of electric current is used in

a)

checking temperature

b)

pan

c)

room heaters

d)

none of the above

89.

The heating effect of an electric current is used in

a)

Hair dryer

b)

A fan

c)

A computer

90.

Connection of more than one device/ appliance to a single socket is called-

a)

Overloading

b)

Short circuit

c)

Both

91.

Which of the following is responsible for the flow of current through a metallic conductor?

a)

Valence electrons

b)

Lone pair of electrons

c)

Free electrons

d)

None of the above

92.

Electrons move easily in

a)

insulators

b)

conductors

c)

capacitors

d)

none of the above

93.

A/ An ________ is used to provide electricity to the bulb in a torch .

a)

electric switch

b)

electric motor

c)

electric cell

d)

screw driver

94.

The lower part of a bulb is called _____.

a)

metal

b)

apex

c)

base

d)

armature

95.

The electrolyte used to electroplate Cu on the spoon is

a)

CuSO4

b)

AgNO3

c)

ZnSO4

d)

None of the above

96.

An electrolyte is a compound which in its molten or aqueous state conducts an electric current by decomposing the current.

a)

True

b)

False

97.

The electrolyte used to electroplate Cu on the spoon is

a)

CuSO4

b)

AgNO3

c)

ZnSO4

d)

None of the above

98.

Which of the following solid materials are CONDUCTORS of electricity?

a)

Glass

b)

Iron

c)

Rubber

d)

Wood

e)

Aluminium

99.

A conductor is any material which _____________ electricity to pass through it

a)

Allows

b)

Does not allow

100.

Which of the following solids are INSULATORS of electricity

a)

Nickel

b)

Wood

c)

Rubber

d)

Zinc

e)

Glass

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