NSO Level 1- Science Olympiad (SOF) Class 8: Questions 675 - 678 of 1076

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Question number: 675

» Metals and Non-Metals

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MCQ▾

Question

Phosphorous occur in nature in the form of compounds only. The reason is

Choices

Choice (4)Response

a.

It has strong affinity for moisture

b.

It easily reacts with metals and non-metals to form compounds

c.

It has strong affinity for oxygen

d.

Question does not provide sufficient data or is vague

Question number: 676

» Reproduction in Animals

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MCQ▾

Question

Here are different stages of conception and child birth. Arrange them in the correct order.

  1. The ovum comes out of the ovary and reaches the fallopian tube.

  2. Zygote undergoes cell division and forms the embryo.

  3. Sperm reaches the fallopian tube and fertilisation takes place.

  4. Embryo gets implanted in the uterus and conception takes place.

  5. Embryo develops to foetus and then to a fully grown baby

Choices

Choice (4)Response

a.

3,1, 2,4, 5

b.

1,3, 4,2, 5

c.

2,4, 3,1, 5

d.

1,3, 2,4, 5

Question number: 677

» Combustion and Flame

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MCQ▾

Question

Water is used as a fire extinguisher. How does it help to put out the fire?

Choices

Choice (4)Response

a.

Water brings the temperature below its ignition temperature

b.

Water cools the combustible substance

c.

Water vapour cuts off the air supply

d.

All a. , b. and c. are correct

Question number: 678

» Metals and Non-Metals

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MCQ▾

Question

The process of purification of metals from the ores is called

Choices

Choice (4)Response

a.

Refining

b.

Reduction

c.

Mining

d.

Concentration

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