NSO Level 1- Science Olympiad (SOF) Class 10: Questions 629 - 633 of 986

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Passage

Direction: Read the passage carefully and answer the questions below

The surface of the ocean is at a higher temperature than the layers below. This temperature difference is exploited to generate energy. This requires Ocean Thermal Energy Conversion plants, which converts ocean thermal energy to electricity.

Question number: 629 (2 of 2 Based on Passage) Show Passage

» Sources of Energy

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MCQ▾

Question

The surface of the ocean is at a higher temperature than the layers below. This is because of

Choices

Choice (4)Response

a.

Atmospheric air

b.

Earth magma

c.

Sun’s heat warms up the upper layers of the sea

d.

Question does not provide sufficient data or is vague

Question number: 630

» Metals and Non - Metals

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MCQ▾

Question

Which is not correct statement for ore?

Choices

Choice (4)Response

a.

Metal of high reactivity Sulphide ore

b.

Metal of low reactivity Sulphide ore

c.

Metal of medium reactivity Carbonate ore

d.

Metal of high reactivity Electrolysis of molten ore

Question number: 631

» Chemical Reactions and Equation

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MCQ▾

Question

Figure shown the heated the Washing soda(sodium bicarbonate)

Figure Shown the Heated the Washing Soda (Sodium Bicarbonate)

What will happen?

First reaction product is sodium oxide

Second products carbon dioxide gas

The reaction is decomposition

Reactions need heat above degrees Celsius

Choices

Choice (4)Response

a.

(1), (2), (3) and (4)

b.

(1), (2) and (3)

c.

(3), (4)

d.

(2), (3) and (4)

Question number: 632

» Our Environment and Its Management

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MCQ▾

Question

Why should we conserve forest and wild life?

Choices

Choice (4)Response

a.

To protect biodiversity

b.

To continue food chain

c.

To maintain balance

d.

To maintain ecosystem

Question number: 633

» Chemical Reactions and Equation

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MCQ▾

Question

Which of the following statements is incorrect?

Choices

Choice (4)Response

a.

Chemical equation inform us about the symbol and formulae of substances involved in a reaction

b.

Reaction that involves the gain of oxygen or loss of hydrogen is called the Reduction

c.

The chemical reactions in which a more reactive element displaces a less reactive element from a compound are known as displacement reactions

d.

The reactions in which two or more substances combine to form a new substance are called combination reaction

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