NSO Level 1- Science Olympiad (SOF) Class 10: Questions 646 - 650 of 986

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Question number: 646

» Our Environment and Its Management

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MCQ▾

Question

Flow of energy in an ecosystem is always

Choices

Choice (4) Response

a.

Bidirectional

b.

No specific direction

c.

Multi directional

d.

Unidirectional

Question number: 647

» Acids, Bases and Salts

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MCQ▾

Question

What gas is evolved when a hydrochloric acid reacts with a metal aluminum oxide is,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 648

» Light - Reflection and Refraction

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Match List-Ⅰ List-Ⅱ▾

Question

Match the column I and column II and the select the correct option from the coded given below:

List-Ⅰ (Column I) List-Ⅱ (Column II)

(A)

Act as concave mirror

(i)

Curved outward

(B)

Convex Mirror

(ii)

Used in street lights

(C)

Act as a convex mirror

(iii)

Used for security checking purposes

(D)

Concave Mirror

(iv)

Curved inward

Choices

Choice (4) Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (i)
  • (ii)
  • (iii)

b.

  • (iv)
  • (i)
  • (iii)
  • (ii)

c.

  • (iv)
  • (ii)
  • (i)
  • (iii)

d.

  • (iii)
  • (ii)
  • (iv)
  • (i)

Question number: 649

» Our Environment and Its Management

Edit
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