NSO Level 1- Science Olympiad (SOF) Class 9: Questions 551 - 555 of 1123

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Question number: 551

» Chemistry » The Nature of Matter

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MCQ▾

Question

Arrange the steps of fractional distillation of air in the correct order.

  1. Air is compressed by increasing the pressure

  2. Air is cooled by decreasing the temperature to get liquid air.

  3. Liquid air is allowed to warm up slowly in a fractionating column.

  4. Gases get separated at different heights depending on their boiling points.

Choices

Choice (4) Response

a.

1,2, 4,3

b.

1,4, 2,3

c.

1,3, 2,4

d.

1,2, 3,4

Question number: 552

» Chemistry » Matter

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MCQ▾

Question

Sweety washed her clothes on a sunny day and spread them for drying. All the clothes were dried within 1 hour. She checked the atmospheric temperature. It was 38°C. Water boils at 100°C temperature. How did the clothes dried up at 40°C? The possible explanation is

1) There was no water in the washed clothes.

2) Evaporation takes place below 100°C also.

3) She has spread the clothes completely.

4) All of above

Choices

Choice (4) Response

a.

2 & 3

b.

1 & 4

c.

1 & 2

d.

1 & 3

Question number: 553

» Biology » Natural Resources

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MCQ▾

Question

Oxygen is harmful for

Choices

Choice (4) Response

a.

Nitrogen fixing bacteria

b.

Ferns

c.

Chara

d.

Mango tree

Question number: 554

» Chemistry » Structure of the Atom

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MCQ▾

Question

Which of the following is not an isotope of hydrogen atom?

Choices

Choice (4) Response

a.

Tritium

b.

Deuterium

c.

Protium

d.

Titanium

Question number: 555

» Biology » Improvement in Food Resources

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MCQ▾

Question

As marine fish stock gets depleted, the demand for more fish can be met only by

Choices

Choice (4) Response

a.

Mariculture

b.

Agriculture

c.

Horticulture

d.

Aquaculture

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