NSO Level 1- Science Olympiad (SOF) Class 10: Questions 733 - 737 of 986

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Question number: 733

» Our Environment and Its Management

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MCQ▾

Question

Depletion of ozone is mainly due to

Choices

Choice (4) Response

a.

Hydrogen

b.

Chlorofluorocarbon compounds

c.

Pesticides

d.

Carbon monoxide

Question number: 734

» Chemical Reactions and Equation

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MCQ▾

Question

Students added to a test tube containing . Which of the following observation are correct?

(i) Blue solution changes to Colorless

(ii) New Coating is seen on Al

(iii) Zn is more reactive than Al

(iv)

Choices

Choice (4) Response

a.

(i) (ii) & (ii)

b.

(ii) (iii) & (iv)

c.

(i) (ii) & (iv)

d.

(i) (iv) & (iii)

Question number: 735

» Metals and Non - Metals

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MCQ▾

Question

Copper sulphate was taken in two test tube. Copper and aluminum were added in these tubes. After reaction color of copper and aluminum is

Choices

Choice (4) Response

a.

Colorless and reddish brown

b.

Blue and black

c.

Green and Colorless.

d.

All of the above

Question number: 736

» Metals and Non - Metals

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MCQ▾

Question

Read the given statements and mark the correct option.

Statement 1: All metals react with chlorine to form ionic metal chlorides.

Statement 2: Non-metals do not react with chlorine.

Choices

Choice (4) Response

a.

Statements 1 and 2 are wrong.

b.

Statements 1 and 2 are true.

c.

Only Statement 1 is true.

d.

Only Statement 2 is true.

Question number: 737

» Light - Reflection and Refraction

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MCQ▾

Question

In optics an object which has higher refractive index is known as

Choices

Choice (4) Response

a.

Refractive index

b.

Optically denser

c.

Optical density

d.

Optically rarer