Science - Physical and Chemical Changes
Exam Duration: 45 Mins Total Questions : 30
Identify the change undergone by burning of wood.
- (a)
Reversible change
- (b)
Physical change
- (c)
Chemical change
- (d)
All of the above
Why is the rusting of iron grouped under a chemical change?
- (a)
It changes its colour.
- (b)
It becomes powdery.
- (c)
A new substance is formed.
- (d)
It changes its shape
Study the reaction given below
What kind of a change takes place in the given reaction?
- (a)
Chemical change
- (b)
Physical change
- (c)
Biochemical
- (d)
Both (A) and (B)
What kind of change is undergone when wheat flour is made into a chapati?
- (a)
Physical change.
- (b)
Reversible, chemical change.
- (c)
Irreversible, chemical change.
- (d)
Change of state.
Which of the following is a chemical change?
- (a)
Food gives out a foul smell
- (b)
Pollution of air caused due to explosion of fireworks
- (c)
Change of colour in a cut apple, if left outside
- (d)
All of the above
Some pieces of chalk are mixed with water. In this change, how many new substances is/are formed?
- (a)
1
- (b)
2
- (c)
3
- (d)
No new substance is formed
What kind of change does sodium chloride undergo when it is added to water?
- (a)
Physical change
- (b)
Chemical change
- (c)
Chemical reaction
- (d)
Temporary change
Match the entries in Column-I with those in Column-II.
- (a)
a-2, b-3, c-4, d-t
- (b)
a-4, b-3, c-2, d-t
- (c)
a-4, b-3, c-1, d-2
- (d)
a-3, b-4, c-2, d-l
Which of the following properties of iron is NOT a physical property?
- (a)
Electrical conductivity
- (b)
Magnetic property
- (c)
Good conductor of heat
- (d)
Reaction with moisture to get rusted
Which of the following is NOT a property of physical change?
- (a)
Change in state and colour
- (b)
Change in composition
- (c)
Temporary change
- (d)
Reversible change
What kind of change is undergone by the expansion of railway tracks during summer?
- (a)
Irreversible, physical change
- (b)
Reversible, physical change
- (c)
Irreversible, chemical change
- (d)
Reversible, chemical change
Which of the following is NOT a physical change?
- (a)
Tearing a paper
- (b)
Heating an iron rod to bend it
- (c)
Freezing water into ice
- (d)
Growth of a sapling into a tree
What kind of change is neutralisation?
- (a)
A physical change
- (b)
A chemical change
- (c)
Sometimes a physical and sometimes a chemical change
- (d)
Neither a physical nor a chemical change
Identify the correct characteristic of a physical change.
- (a)
Permanent change
- (b)
Irreversible
- (c)
Change in composition
- (d)
Change in colour
Which of the following changes does sugar undergo when it is dissolved in water to form sugar solution?
- (a)
Chemical change
- (b)
Physical change
- (c)
Neutralization reaction
- (d)
Irreversible change
Which of the following is a chemical change?
- (a)
Cooking of food
- (b)
Evaporation of water
- (c)
Mowing of grass
- (d)
Melting of wax
Which of the following is NOTa chemical change?
- (a)
Respiration
- (b)
Crystallization
- (c)
Combustion
- (d)
Oxidation
Which of the following is NOT correctly paired?
- (a)
Sublimation - Physical change
- (b)
Precipitation - Physical change
- (c)
Decomposition - Chemical change
- (d)
Decantation - Chemical change
What kind of change is undergone by the burning of wax?
- (a)
Physical change
- (b)
Chemical change
- (c)
Reversible change
- (d)
Periodic change
Which of the following is an irreversible change?
- (a)
Change of water into steam
- (b)
Melting of wax
- (c)
Transpiration
- (d)
Corrosion
When a substance undergoes a physical change, what change is seen in its mass?
- (a)
It increases.
- (b)
It decreases.
- (c)
It remains the same.
- (d)
It either increases or decreases.
Which of the following will be true of 'ash' that is obtained by burning wood in air?
- (a)
Some properties of ash will not be similar to wood.
- (b)
The properties of ash will be similar to wood.
- (c)
The properties of ash will be different from both wood and air.
- (d)
The properties of ash will be similar to both wood and air.
Which of the following is a physical change?
- (a)
The rusting of iron nails
- (b)
The burning of diesel
- (c)
Breaking of a glass bottle
- (d)
The heating of iron with sulphur
What change is observed when a piece of magnesium wire is burnt?
- (a)
Physical change
- (b)
Chemical change
- (c)
Nuclear change
- (d)
Both (A) and (B)
Observe the following figures.
Identify the type of change.
- (a)
Physical change
- (b)
Chemical change
- (c)
Reversible change
- (d)
Periodic change
Which of the following suffers maximum damage due to the rusting of iron?
- (a)
2
- (b)
1
- (c)
3
- (d)
4
Karuna wrapped some green gram pulses in a wet cotton cloth and when she observed them after a couple of days, she found small white growths on them. What could be this change?
- (a)
Physical change
- (b)
Temporary change
- (c)
Chemical change
- (d)
Periodic change
On sprinkling salt on an ice cube, it starts melting. What change does the cube of ice undergo?
- (a)
Physical change
- (b)
Chemical change
- (c)
Molecular change
- (d)
Permanent change
Which of the following changes does food in a refrigerator undergo?
- (a)
Slow, physical change
- (b)
Slow, chemical change
- (c)
Fast, chemical change
- (d)
Fast, physical change
Which of the following changes results in the formation of a new substance?
- (a)
Physical
- (b)
Reversible
- (c)
Chemical
- (d)
Periodic