Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 7]: Questions 1 - 7 of 95

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Question 1

Question

MCQ▾

Which of the following below shows a physical change?

Choices

Choice (4)Response

a.

Rusting of iron

b.

Mixture of chalk and water

c.

Burning of magnesium ribbon

d.

Reaction of acid with a base

Question 2

Question

MCQ▾

Which of the following way can be used to prevent rusting of iron?

Choices

Choice (4)Response

a.

Applying layer of grease

b.

Putting article in the water

c.

None of the above

d.

All of the above

Question 3

Question

MCQ▾

Vaporization process is a:

Choices

Choice (4)Response

a.

Chemical change

b.

Physical change

c.

All of the above

d.

None of the above

Question 4

Question

MCQ▾

Statue of liberty is green in color because of?

Figure Showing Statue of Liberty

Choices

Choice (4)Response

a.

Reversible change

b.

Physical change

c.

Chemical change

d.

All of the above

Question 5

Question

MCQ▾

Baking soda is also known by:

Choices

Choice (4)Response

a.

Sodium bicarbonate

b.

c.

Sodium hydrogen carbonate

d.

All a., b. and c. are correct

Question 6

Question

MCQ▾

Evaporation of alcohol is a?

Choices

Choice (4)Response

a.

Chemical change

b.

Physical change

c.

None of the above

d.

Question does not provide sufficient data or is vague

Question 7

Question

MCQ▾

Why burning of magnesium ribbon is a chemical change?

Choices

Choice (4)Response

a.

Because no energy changes take place

b.

Because new substances are formed

c.

Because the process is reversible

d.

None of the above

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