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chemistry

Total questions: 113

Worksheet time: 54mins

Name
Class
Date
1.

Which of the following does not conduct electricity?

a)

Sugar solution

b)

 Vinegar solution

c)

Lemon juice solution

d)

Caustic soda solution

2.

An electric current can produce

a)

heating effect

b)

chemical effect

c)

magnetic effect

d)

all of the above

3.

Pure or distilled water is a

a)

poor conductor

b)

good conductor

c)

Both

d)

None of the above

4.

Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?

a)

To increase acidity

b)

 To increase conductivity

c)

So that the colour becomes more prominent

d)

 To burn copper sulphate

5.

Which of the following is a bad conductor of electricity?

a)

 Distilled water

b)

Silver nitrate

c)

 Sulphuric acid

d)

Copper sulphate

6.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

7.

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

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

8.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

9.

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

10.
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.
11.

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

12.

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

13.

The filament of the bulb gets heated to a high temperature due to the

a)

magnetic effect of current

b)

heating effect of current

c)

chemical effect of current

d)

all of these

14.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

15.

LED stands for

(a)  

16.

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

17.

Radhika wants to electroplate a plate with ZINC. She has a Zinc bar and the plate. But she does not know which should be the anode and which should be the cathode.

a)

Zinc Bar - Anode, Plate - Cathode

b)

Zinc Bar - Cathode, Plate - Anode

c)

Both Anode and Cathode should be Zinc

18.

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

19.

Flow of electron is called

a)

Electroplating

b)

Electric current

c)

Electrodes

d)

Electrolyte

20.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

21.

Which of the following does not conduct electricity?

a)

Sugar solution

b)

 Vinegar solution

c)

Lemon juice solution

d)

Caustic soda solution

22.

An electric current can produce

a)

heating effect

b)

chemical effect

c)

magnetic effect

d)

all of the above

23.

Pure or distilled water is a

a)

poor conductor

b)

good conductor

c)

Both

d)

None of the above

24.

Why do we add little dilute sulphuric acid to copper sulphate solution during electroplating?

a)

To increase acidity

b)

 To increase conductivity

c)

So that the colour becomes more prominent

d)

 To burn copper sulphate

25.

Which of the following is a bad conductor of electricity?

a)

 Distilled water

b)

Silver nitrate

c)

 Sulphuric acid

d)

Copper sulphate

26.

Electroplating is based on ___________of an electric current.

a)

Physical effect

b)

Chemical effect

c)

Heating effect

d)

Magnetic effect

27.

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

a)

Gold

b)

Chromium

c)

Tin

d)

Zinc

28.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

29.

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

30.
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.
31.

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

32.

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

33.

The filament of the bulb gets heated to a high temperature due to the

a)

magnetic effect of current

b)

heating effect of current

c)

chemical effect of current

d)

all of these

34.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

35.

LED stands for

(a)  

36.

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

37.

Radhika wants to electroplate a plate with ZINC. She has a Zinc bar and the plate. But she does not know which should be the anode and which should be the cathode.

a)

Zinc Bar - Anode, Plate - Cathode

b)

Zinc Bar - Cathode, Plate - Anode

c)

Both Anode and Cathode should be Zinc

38.

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

39.

Flow of electron is called

a)

Electroplating

b)

Electric current

c)

Electrodes

d)

Electrolyte

40.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

41.

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

a)

Iron

b)

Copper

c)

Chromium

d)

Aluminium

42.
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.
43.

LED stands for

a)

light emitting diode

b)

light efficient diode

c)

length emitting diode

d)

light emitting device

44.

Adding common salt to distilled water makes it

a)

Good Conductor

b)

Poor Conductor

c)

No change

d)

Both A and B

45.

An electrolyte is

a)

a metal

b)

a solution

c)

a liquid that conducts electricity

d)

none of these

46.

Flow of electrons is called

a)

Electrode

b)

Electrolyte

c)

Electric current

d)

Electroplating

47.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

vegetable oil

48.

The object to be electroplated is taken as ____________ electrode.

a)

cathode

b)

anode

c)

electrode

d)

none of these

49.

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

50.

conductors can allow electricity because of the presence of

a)

free ions

b)

free electrons

c)

free protons

d)

atoms

51.

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

a)

nickel

b)

chromium

c)

sodium

d)

silver

52.

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

53.

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

54.

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

55.

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

56.

The article to be electroplated is made

a)

the anode

b)

the cathode

c)

either anode or cathode

d)

none of these

57.

During electrolysis of water,

a)

hydrogen gas is produced

b)

oxygen gas is produced

c)

water is produced

d)

both (a) and (b)

58.

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

59.

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

a)

(+) - Oxygen; (-) - Hydrogen

b)

(+) - Oxygen; (-) - Carbon

c)

(+) - Hydrogen (-) - Oxygen

60.

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

61.

Which of the following is inflammable Substances?

a)

Petrol

b)

Wood

c)

Paper

d)

Straw

62.

When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion?

a)

Explosion

b)

Random combustion

c)

Rapid combustion

d)

Spontaneous combustion

63.
Which of the following liquid is not a good conductor of electricity?
a)
Orange juice
b)
Tap water
c)
Vinegar
d)
Honey
64.

When magnesium ribbon burnt it produce

a)

Magnesium hydroxide

b)

Magnesium oxide

c)

Magnesium chloride

d)

Magnesium sulphate

65.

An electric current can produce

a)

heating effect only.

b)

chemical effect only.

c)

magnetic effect only.

d)

chemical, heating, and magnetic effects.

66.

Which one of the following solutions will not conduct electricity?

a)

lemon juice

b)

vinegar

c)

tap water

d)

toothpaste

67.

The substances which have very low ignition temperature will

a)

Catch fire easily

b)

Will not catch fire

c)

Catch fire after some time

d)

None of these

68.

Tick the chemical effect of elecric current

a)

boiling

b)

motion

c)

electro shock

d)

Electroplating

69.

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)

Tap Water is a bad conductor of electricity

70.
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
71.

the products of combustion are

a)

carbon dioxide

b)

oxygen & water

c)

water and fire

72.

coal burns with _________

a)

flame

b)

only glow

c)

both a & b

d)

none of these

73.

Electroplating prevents

a)

electric current

b)

chemical effect

c)

lightening

d)

rusting

74.

Which one is the polluting waste generated by electroplating factories?

a)

Used up electrodes

b)

Electrolytes

c)

Corroded Metals

75.

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

a)

(+) - Oxygen; (-) - Hydrogen

b)

(+) - Oxygen; (-) - Carbon

c)

(+) - Hydrogen (-) - Oxygen

76.

LED stands for

(a)  

77.

Select the poor conductors of electricity

a)

Honey

b)

Plastic

c)

Vinegar

d)

Distilled Water

78.

We can electroplate plastic on iron.

a)

True

b)

False

79.

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

80.

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

a)

Proton

b)

Neutron

c)

Electron

d)

Ions

81.

During electrolysis the positively charged ions travel towards Cathode.

a)

True

b)

False

82.

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

(a)  

83.

Bicycle bells and wheel rims are electroplated with which metal?

a)

Tin

b)

Nickle

c)

Chromium

d)

Silver

84.

The element in a kettle or toaster act as a large resistor

a)

True

b)

False

85.

The filament in this light bulb offers high resistance, thereby producing...(select all that apply)

a)

Heat

b)

Light

c)

Sound

d)

potential glow

86.

A short circuit has the following:

a)

Wires connected across the battery

b)

No wires across the battery

c)

Components that don't work, eg. a light bulb

87.

The following diagram is that of an .....

a)

electro circuit

b)

electro nail

c)

electromagnet

d)

magnetic cell

88.

Which of the following can make an electromagnet stronger? (select all that apply)

a)

Increasing the number of turns of wire around the nail/core

b)

increasing the number of cells

c)

decreasing the number of cells used

89.

Name a component that can be added to an electromagnet to turn on and off the magnetic field.

(a)  

90.

The breaking down of a substance into its component elements by passing an electric current through it is called...

a)

thermal decomposition

b)

electrolysis

c)

electrical breakdown

91.

Copper chloride solution is broken down by electrolysis. On which electrode are the Chlorine ions deposited on? Positive anode OR negative cathode.

(a)  

92.

The negatively charged electrode is called the _____

a)

Anode

b)

Cathode

93.

The following diagram is that of an .....

a)

electro circuit

b)

electro nail

c)

electromagnet

d)

magnetic cell

94.

Acids are good conductors of electricity

a)

true

b)

false

95.

2.Water containing which of the following substances may conduct electricity

a)

salt

b)

sugar

96.

3.Why does the bulb glow when the electric current passes through it

a)

due to the heating effect of the current

b)

due to the magnetic effect of the current

c)

both A and B

d)

None of the above

97.

THERE ARE 2 WIRES CALLED LEADS ATTACHED TO THE LED.One lead is slightly longer than the other.

a)

true

b)

false

98.

5.Does the compass needle show deflection for lemon juice

a)

yes

b)

no

99.

6.Does the compass needle show deflection of tap water

a)

yes

b)

no

100.

7.Lemon juice is --------------conductor

a)

good

b)

bad

101.

8 .Milk is a -------------conductor.

a)

good

b)

bad

102.

Small amount of mineral salts present naturally in water are beneficial for human health .

a)

truue

b)

false

103.

10.The liquids that conduct electricity are solutions of acids,bases and salts in water

a)

true

b)

false

104.

Which is a better conductor of electricity?

a)

Electrolytes

b)

Metals

c)

Non metals

d)

None of these

105.

Which of these is used for detecting weak electric current passing through a liquid?

a)

Torch

b)

LED

c)

CFL

d)

None of these

106.

We can also detect weak electric current flowing through a liquid by using a

a)

Metal

b)

Silver

c)

Compass

d)

None of the above

107.

Distilled water does not conduct electricity

a)

True

b)

False

108.

Distilled water becomes a good conductor of electricity on dissolving

a)

A little salt in it

b)

Little sugar in it

c)

Both

d)

None of these

109.

The process of depositing a layer of any desired metal on another metal by means of electricity is called?

a)

Chromo-plating

b)

Electroplating

c)

Corroding

d)

Scratching

110.

Properties of chromium include:

a)

Shiny appearance

b)

Does not corrode

c)

Resists scratches

d)

All of these

111.

Tins cans used for storing food are made by

a)

Electroplating of iron onto tin

b)

Chromium onto tin

c)

Tin onto Iron

d)

Tin onto Silver

112.

Iron is used in bridges and automobiles to provide strength, however, iron tends to corrode and rust, so a coating of _____ is deposited on iron to protect it from corrosion and formation of rust.

a)

Tin

b)

Bronze

c)

Zinc

d)

None of these

113.

For electroplating an iron object with copper metal, a copper plate is made _______

a)

positive electrode

b)

Negative electrode

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