NSO Level 1- Science Olympiad (SOF) Class 10: Questions 614 - 618 of 986

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Question number: 614

» Acids, Bases and Salts

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MCQ▾

Question

A few drops of liquid were added to distilled water it was observed that the pH of the water decreased.

What the liquid sample could be?

Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

Question number: 615

» Metals and Non - Metals

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MCQ▾

Question

A mixture of Sodium and Sulphur is mixed with oxygen. In this reaction

Choices

Choice (4) Response

a.

Only Sulphur reacts oxygen

b.

Only Sodium reacts oxygen

c.

Sodium and Sulphur reacts oxygen

d.

None of the above

Passage

Direction: Read the passage carefully and answer the questions below

Tidal Energy:

The rise and fall of sea level caused by the gravitational forces exerted by the Sun, Moon and the rotation of the Earth is called a Tide. When there is a high tide, the increase in water in the sea is stored in the dam. The estuary has lower level of water. Water flows from sea to estuary and the turbine rotates. As turbine rotates, electricity is generated.

Question number: 616 (1 of 2 Based on Passage) Show Passage

» Sources of Energy

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MCQ▾

Question

When high tide, estuary has lower level of water and water flows from sea to estuary and the turbine rotates. If there is low tide, estuary has higher level of water than turbine and it

Choices

Choice (4) Response

a.

Rotates

b.

Does not rotate

c.

Any of the above

d.

Depends upon tide

Question number: 617 (2 of 2 Based on Passage) Show Passage

» Sources of Energy

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MCQ▾

Question

Advantage (s) of tidal energy is/are

Choices

Choice (4) Response

a.

Reliable more than solar and wind

b.

Renewable

c.

Low maintenance cost

d.

All a. , b. and c. are correct

Question number: 618

» Chemical Reactions and Equation

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MCQ▾

Question

Consider the following table:

Table shown the reactivity of metal

Table shown the reactivity of metal

From the above data, the decreasing order of reactivity of metal is

Choices

Choice (4) Response

a.

Al > Zn > Fe > Cu

b.

Al > Cu > Zn > Fe

c.

Fe > Al > Zn > Cu

d.

Question does not provide sufficient data or is vague