oly class-7 science set-4 – The Smart Visions

Created on April 02, 2025

Olympiad Class-7 Science Set-4

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1 / 25

Which of the following is NOT a sign of a
chemical change?

A) Change in state

B) Production of gas

C) Change in colour

D) Formation of a new substance

2 / 25

Which property does NOT change in a
physical change?

A) Chemical composition

B) State

C) Size

D) Shape

3 / 25

Which of the following is a physical
property?

A) Reactivity

B) Flammability

C) Colour

D) Toxicity

4 / 25

Which of the following is an example of a
chemical change?

A) Cutting a piece of wood

B) Burning of magnesium ribbon

C) Boiling water

D) Dissolving salt in water

5 / 25

Which of the following is a chemical
change?

A) Dissolving sugar in water

B) Cutting of paper

C) Melting of wax

D) Burning of magnesium ribbon

6 / 25

What kind of change is the formation of a
sugar solution?

A) Physical change

B) Irreversible change

C) Chemical change

D) Permanent change

7 / 25

What is the effect of adding acidic solution
to China rose indicator?

A) Turns green

B) Turns magenta

C) Turns blue

D) Turns yellow

8 / 25

Which of the following is a physical
change?

A) Rusting of iron

B) Melting of ice

C) Burning a candle

D) Cooking food

9 / 25

What is the outcome of the reaction
between copper sulfate and iron?

A) Iron sulfate and copper are formed

B) No reaction occurs

C) Copper sulfate remains unchanged

D) Iron reacts with sulfur

10 / 25

What type of change is involved in making
curd from milk?

A) Physical change

B) Chemical change

C) None of the above

D) Reversible change

11 / 25

What is the process of depositing a layer of
zinc on iron called?

A) Painting

B) Rusting

C) Greasing

D) Galvanization

12 / 25

Which of the following is NOT a physical
change?

A) Burning wood

B) Freezing of water

C) Melting of butter

D) Crushing a can

13 / 25

Which of the following changes is generally
reversible?

A) Chemical change

B) None of the above

C) Physical change

D) Both

14 / 25

What type of change is boiling of water?

A) None of the above

B) Physical change

C) Chemical change

D) Irreversible change

15 / 25

Which change involves the formation of a
precipitate?

A) Dissolving salt in water

B) Melting of ice

C) Mixing sodium sulfate and barium chloride

D) Mixing vinegar and baking soda

16 / 25

What is the result of burning a piece of
paper?

A) Physical change

B) Chemical change

C) Reversible change

D) Temporary change

17 / 25

When a piece of paper is torn into small
pieces, what kind of change occurs?

A) None of the above

B) Both

C) Chemical change

D) Physical change

18 / 25

What happens when a chemical change
occurs?

A) Anew substance is formed

B) The substance only changes in appearance

C) The state of the substance changes

D) No new substance is formed

19 / 25

What happens to magnesium ribbon when
it burns?

A) It evaporates without any residue

B) It remains unchanged

C) It forms a new substance called magnesium oxide

D) It turns into water

20 / 25

How can rusting of iron be prevented?

A) By washing with water

B) By painting or coating with grease

C) By heating the iron

D) By keeping iron in the sun

21 / 25

When a candle burns, what type of changes
occur?

A) Only chemical changes

B) No changes

C) Only physical changes

D) Both physical and chemical changes

22 / 25

What is the process of coating iron with a
layer of zinc to prevent rusting called?

A) Reduction

B) Oxidation

C) Polymerization

D) Galvanization

23 / 25

Which of the following is an example of a
chemical change in our daily life?

A) Cutting vegetable s

B) Mixing sand and water

C) Cooking food

D) Melting chocolate

24 / 25

What is the result of rusting of iron?

A) Iron forms iron oxide

B) Iron remains unchanged

C) Iron turns into iron sulfide

D) Iron turns into water

25 / 25

When a piece of paper is torn into small
pieces, what kind of change occurs?

A) None of the above

B) Both

C) Chemical change

D) Physical change

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