NSO Level 1- Science Olympiad (SOF) Class 10: Questions 617 - 621 of 986

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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: 617 (2 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: 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

Question number: 619

» Magnetic Effects of Electric Current

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MCQ▾

Question

The magnitude of the induced current due to the relative motion of coil and a magnet does not depend on

Choices

Choice (4)Response

a.

Speed of the relative motion

b.

Resistivity of wire of coil

c.

Pole strength of the magnet

d.

Number of turns of coil

Question number: 620

» Our Environment and Its Management

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MCQ▾

Question

What is the name given for replenishment of forest?

Choices

Choice (4)Response

a.

Deforestation

b.

Silviculture

c.

Afforestation

d.

Sericulture

Question number: 621

» Our Environment and Its Management

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MCQ▾

Question

Which of the following are environment-friendly practices?

Choices

Choice (4)Response

a.

Carrying cloth-bags to put purchases in, while shopping

b.

Walking to school instead of getting your mother to drop you on her scooter

c.

Switching off unnecessary lights and fans

d.

All a. , b. and c. are correct

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