Changes Around Us Online Test

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Changes Around Us

Description: changes Squares and Square RootsMeaning of a Square Root and Finding Square RootSquares and Square RootsChanges Around usReversible ChangesApplications of Heating and CoolingIrreversible Changes
Number of Questions: 15
Created by: Divya Kade
Tags: changes Squares and Square Roots Meaning of a Square Root and Finding Square Root Changes Around us Reversible Changes Applications of Heating and Cooling Irreversible Changes

Which of the following is an example of periodic change?

Sneezing
Heartbeat
Earthquake
Eruption of volcano
An accident

Which of the following statements describes an endothermic change?

Changes in which heat is liberated.
Changes which take place in few seconds.
Changes which take days, months, and years to occur.
Changes in which energy is absorbed.
Changes which occur at fixed interval of time.

Which of the following statements does not describe physical change?

Composition of substance remains same.
No new substance is formed.
Chemical properties of a substance change.
Physical changes are reversible.
Expansion of iron on heating is an example of physical change.

Digestion of food is a _____________.

a physical change
a temporary change
a reversible change
a chemical change
a spontaneous change

Heating of camphor is a process of sublimation. Which of the following changes is not related to camphor sublimation?

Endothermic change
Physical change
Natural change
Fast change
Reversible change

The process of converting gas directly into solid is called ___________.

freezing
condensation
sublimation
evaporation
deposition

Which of the following is an exothermic change?

Melting of ice cream
Melting of metals
Burning sugar
Baking bread
Evaporation of water

Metal _________ on heating.

contracts
changes it shape
remains same
expands
contracts and expands

How do molecules react when solid is changed into liquid?

They form a tight bond.
They move apart from each other.
Some have tight bond and some move apart from each other.
They get packed close together.
They move very far from each other.

What happens during a chemical change?

There is no change in composition.
A substance combines with other to form a new substance.
There is no change in molecular composition.
Energy is always given out.
There is no change in colour.

What is the chemical name of a salt?

Sodium hydrogen carbonate
Calcium dihypochlorite
Sodium chloride
Aluminum sulphate
Sodium hydroxide

Souring of milk is an example of __________.

a periodic change
a momentary change
an instant change
a temporary change
an undesirable change

Burning of candle is a type of __________.

chemical change
physical change
permanent change
both chemical change and physical change
neither chemical change nor physical change

Which of the following changes cannot be reversed?

Production of charcoal
Dissolving salt in water
Boiling of water
Melting of ice
Melting wax

Which group of changes include only chemical changes?

Metabolism of food in the body, electroplating a metal and crushing a can
Mixing an acid and a base, baking a cake and breaking a glass
Mixing an acid and a base, baking a cake, and electroplating a metal
Electroplating a metal, baking a cake and crushing a can
Metabolism of food in the body, burning a candle and electroplating a metal

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