Question

MULTIPLE CHOICE QUESTIONS
1. Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax
2. Which of the following is a chemical change?
(a) Twinkling of stars
(b) Cooking of vegetables
(c) Cutting of fruits
(d) Boiling of water
3. A chemical change may involve –
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) any or all of the above
4. Which of the following is/are true when milk changes into
curd?
(i) Its state is changed from liquid to semi solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option from below :
(a) (i) and (ii) are correct
(b) (ii) and (iii) are correct
(c) (i), (iii) and (iv) are correct
(d) (i) to (iv) are correct
5. A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from sun.
Physical and Chemical 6 Changes
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34 EXEMPLAR PROBLEMS
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statement(s) is/are correct?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) only (ii)
(d) (i) and (iii)
6. Iron pillar near the Qutub Minar in Delhi is famous for the
following facts. Which of these facts is responsible for its long
stability?
(a) It is more than 7 metres high.
(b) It weighs about 6000 kg.
(c) It was built more than 1600 years ago.
(d) It has not rusted after such a long period.
7. Galvanisation is a process used to prevent the rusting of which
of the following?
(a) Iron
(b) Zinc
(c) Aluminium
(d) Copper
8. Paheli’s mother made a concentrated sugar syrup by dissolving
sugar in hot water. On cooling, crystals of sugar got separated.
This indicates a –
(a) physical change that can be reversed.
(b) chemical change that can be reversed.
(c) physical change that cannot be reversed.
(d) chemical change that cannot be reversed.
9. Which of the following statement is incorrect for a chemical
reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
(d) A gas may be evolved.
10. Two drops of dilute sulphuric acid were added to 1 g of copper
sulphate powder and then small amount of hot water was
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not to be republished
35
added to dissolve it (step I). On cooling, beautiful blue coloured
crystals got separated (step II). Step I and step II are:
(a) physical and chemical changes respectively.
(b) chemical and physical changes respectively.
(c) both physical change.
(d) both chemical change.
VERY SHORT ANSWER QUESTIONS
11. State whether the following statements are true or false:
(a) When a candle burns, both physical and chemical
changes take place.
(b) Anaerobic bacteria digest animal waste and produce
biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.
12. Melting of wax is a change where a solid changes to liquid
state. Give one more such change which you observe in your
surroundings.
13. What kind of change is shown by tearing of paper?
SHORT ANSWER QUESTIONS
14. Match the items of Column I with the items of Column II.
PHYSICAL AND CHEMICAL CHANGES
(a) (i)
(b) ii)
(c) (iii)
(d) (iv)
(e) (v)
Column I Column II
Large crystals Turns lime water milky
Depositing a layer of ( Physical change
zinc on iron
Souring of milk Rust
Carbon dioxide Sugar candy (Mishri)
Iron oxide Chemical change
(f) Dissolving common (vi) Galvanisation
salt in water
21052014 © NCERT
not to be republished
36 EXEMPLAR PROBLEMS
15. Fill in the blanks in the following statements using the words
given in the box.
rusted, colourful, substance, chemical, physical,
reversible, iron oxide, object
(a) Making sugar solution is a ____________ change.
(b) A physical change is generally____________.
(c) Grinding of wheat grain changes its size. It is a
____________ change.
(d) Iron benches kept in lawns and gardens get____________.
It is a _________ change because a new _________ is formed.
16. Classify the following processes into physical or chemical
changes:
(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.

Answer 1

hey friend your answer is
1)rusting of iron
2)cooking of vegetables
3 )all of the above
4)1 to 4 all are correct
5)1 and 3 are true
6)it has not rusted after such a long period
7)copper
8)physical change can reversed
9)option a
10) chemical and physical
11)a is false
b is true
c is true
d is false
12) ice
13 )physical
15)a = physical
b=reversible
c= physical
d=rusted
e=chemical and substance
please mark brainliest