NSO Level 1- Science Olympiad (SOF) Class 8: Questions 639 - 643 of 1076

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Question number: 639

» Metals and Non-Metals

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MCQ▾

Question

Iron is used in construction work in concrete pillars and making grills. Which property of metals is used here?

Choices

Choice (4) Response

a.

Hardness and strength

b.

Ductility

c.

Malleability

d.

Both a. and c. are correct

Question number: 640

» Combustion and Flame

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MCQ▾

Question

Sharda’s grandmother lives in a village and cooks on chulha and uses dry wood or coal as fuel. Sharda’s mother uses LPG for cooking. She checked the colour of the flames. She observed that the flame is yellow in chulha while it is blue in a gas stove. The reason for the colour change in the flame is

Choices

Choice (4) Response

a.

LPG is a complete fuel

b.

Complete combustion takes place in a gas stove

c.

Incomplete combustion takes place in a choola

d.

All a. , b. and c. are correct

Question number: 641

» Combustion and Flame

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MCQ▾

Question

It is not advisable to sleep in a closed room with smouldering coal fire. The reason is

Choices

Choice (4) Response

a.

Carbon monoxide is a poisonous gas

b.

Incomplete combustion of carbon fuels produce carbon monoxide.

c.

Inhaling carbon monoxide for a long time can cause death

d.

All a. , b. and c. are correct

Question number: 642

» Reproduction in Animals

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MCQ▾

Question

The organ which produces ovum is called

Choices

Choice (4) Response

a.

Testes

b.

Uterus

c.

Penis

d.

Ovary

Question number: 643

» Metals and Non-Metals

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MCQ▾

Question

Metals are generally hard and non-brittle. Find the metal which is soft and brittle

Choices

Choice (4) Response

a.

Lead

b.

Sodium

c.

Potassium

d.

All a. , b. and c. are correct

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