NSO Level 1- Science Olympiad (SOF) Class 8: Questions 644 - 650 of 1076

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Question number: 644

» Metals and Non-Metals

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MCQ▾

Question

Arrange the following metals in the descending order of their reactivity.

Zinc Copper , Iron

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 645

» Metals and Non-Metals

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MCQ▾

Question

Silver tarnishes due to the reaction with this non-metal in the air

Choices

Choice (4) Response

a.

Carbon dioxide

b.

Oxygen

c.

Hydrogen sulphide

d.

Nitrogen

Question number: 646

» Reproduction in Animals

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MCQ▾

Question

The stage of the embryo in which all the body parts can be identified is called

Choices

Choice (4) Response

a.

Foetus

b.

Embryo

c.

Gamete

d.

None of the above

Question number: 647

» Combustion and Flame

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MCQ▾

Question

Which type of energy is released when an explosion takes place?

Choices

Choice (4) Response

a.

Heat

b.

Sound

c.

Light

d.

All a. , b. and c. are correct

Question number: 648

» Combustion and Flame

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MCQ▾

Question

Here are some characteristics of inflammable substances. Choose the correct statements from them.

  1. They have low ignition temperature.

  2. They catch fire easily.

  3. They have high ignition temperature.

  4. They do not catch fire easily.

Choices

Choice (4) Response

a.

3 & 4

b.

2 & 3

c.

1 & 4

d.

1 & 2

Question number: 649

» Reproduction in Animals

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MCQ▾

Question

Fusion of male and female gametes is called

Choices

Choice (4) Response

a.

Ejection

b.

Fertilisation

c.

Reproduction

d.

All of the above

Question number: 650

» Metals and Non-Metals

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MCQ▾

Question

Harsh was doing experiment in the science lab. The steps of procedure are given

here.

i) He took a test tube and put 3 - 4 pellets of sodium hydroxide in it.

ii) Added 5 ml water in it and dissolved the pellets in it.

iii) Added some pieces of aluminium foil in the solution.

iv) Brought a lighted match stick near the mouth of the test tube.

He observed that the match stick burnt with a pop sound. Which is the gas produced in this experiment?

Choices

Choice (4) Response

a.

Hydrogen

b.

Carbon dioxide

c.

Oxygen

d.

None of the above

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