NSO Level 1- Science Olympiad (SOF) Class 10: Questions 649 - 654 of 986

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Question number: 649

» Our Environment and Its Management

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MCQ▾

Question

Which of the following limits the number of trophic levels in a food chain?

Choices

Choice (4)Response

a.

Deficient food supply

b.

Polluted air

c.

Water

d.

Decrease in energy at higher trophic levels

Passage

Direction: Read the passage carefully and answer the questions below

Hydro Power Plant:

Dams are constructed at heights to obstruct the flow of water and store it. The stored water has Potential Energy. Water stored in heights now is allowed to flow to low levels. This is called Hydroelectricity because the potential energy of water, which is stored at elevated heights, is converted into kinetic energy of flowing water, which in turn is converted electricity. It is a renewable source of energy, since rainfall comes over and over again.

Question number: 650 (1 of 2 Based on Passage) Show Passage

» Sources of Energy

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MCQ▾

Question

Which of the following is incorrect for hydro power plant?

Choices

Choice (4)Response

a.

It is preferably in hilly terrains

b.

It is pollution free energy

c.

Hydro power Plant need steam turbines

d.

Large amount of methane produced due to submerged vegetation

Question number: 651 (2 of 2 Based on Passage) Show Passage

» Sources of Energy

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MCQ▾

Question

Turbines rotate when

Choices

Choice (4)Response

a.

Solar energy is converted to heat

b.

Water converted into Steam

c.

Potential energy is converted to kinetic energy

d.

Wind energy is converted to kinetic energy

Question number: 652

» Acids, Bases and Salts

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MCQ▾

Question

Sodium hydroxide was added to zinc kept in a test tube. Which one is the correct?

Choices

Choice (4)Response

a.

Reacts with dilute and liberates hydrogen gas.

b.

Bubble of hydrogen gas are formed

c.

A pop sound is obtained

d.

All a. , b. and c. are correct

Question number: 653

» Our Environment and Its Management

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MCQ▾

Question

The figure shown food chain in

Image of shown food chain

Image of Shown Food Chain

Choices

Choice (4)Response

a.

Forest

b.

Pond

c.

Any of the above

d.

Grassland

Question number: 654

» Metals and Non - Metals

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MCQ▾

Question

Hardest metal amongst the following is

Choices

Choice (4)Response

a.

24 carats

b.

21 carats

c.

22 carats

d.

All of the above

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