MCQ Chapter 1 Oceans and Life Class 9 Social Science CBSE

1. What is meant by ocean relief?

The movement of ocean water due to winds

The physical features found on the ocean floor

The rise and fall of ocean water

The distribution of rainfall over oceans

Question 1 of 20

2. Which is the deepest place on Earth?

Mid-Ocean Ridge

Continental Shelf

Mariana Trench

Abyssal Plain

Question 2 of 20

3. Which is the world's longest mountain range hidden beneath the ocean?

Mid-Ocean Ridge

Continental Slope

Mariana Trench

Abyssal Plain

Question 3 of 20

4. What is a continental shelf?

The deepest part of an ocean

A steep underwater mountain

A flat-topped underwater mountain

The shallow, submerged edge of a continent

Question 4 of 20

5. Which ocean-floor feature marks the true edge of a continent with a steep descent?

Abyssal Plain

Continental Slope

Seamount

Guyot

Question 5 of 20

6. What is an abyssal plain?

A steep coastal cliff

A shallow area near a beach

A vast, flat and deep part of the ocean floor

A mountain rising above sea level

Question 6 of 20

7. What is a seamount?

An underwater mountain that does not reach the sea surface

A flat and shallow continental region

A deep valley located on land

A wave formed during a storm

Question 7 of 20

8. How is a guyot generally formed?

By the accumulation of sand along a beach

By the movement of tidal water

By the formation of a continental shelf

When a seamount is flattened by erosion and later submerged

Question 8 of 20

9. Which ocean-floor feature consists of the deepest parts of the ocean?

Continental Shelf

Ocean Trenches

Continental Rise

Abyssal Hills

Question 9 of 20

10. What is the main significance of the continental shelf?

It contains only the deepest ocean waters.

It prevents the formation of ocean currents.

It supports abundant marine life and contains resources such as oil and gas.

It is the only place where tsunamis can occur.

Question 10 of 20

11. What is an ocean wave?

The alternate rising and falling of the ocean surface

The permanent movement of water in one direction

The daily rise and fall of sea level caused by tides

The movement of ships across the sea

Question 11 of 20

12. What is the primary cause of most ocean waves?

The movement of continents

The rotation of the Moon

The rise and fall of tides

Winds blowing across the water

Question 12 of 20

13. What is the crest of a wave?

The lowest point of a wave

The highest point of a wave

The horizontal distance between two waves

The time taken for a wave to travel

Question 13 of 20

14. What is the trough of a wave?

The highest point of the wave

The distance between two consecutive crests

The lowest point of the wave

The direction in which a current flows

Question 14 of 20

15. What does wavelength measure?

The horizontal distance between two consecutive crests or troughs

The vertical distance from the ocean floor to the surface

The number of waves passing a point each hour

The time required for a wave to reach the coast

Question 15 of 20

16. What is wave frequency?

The height of a wave above sea level

The distance between the ocean and the coast

The time taken by a wave to reach the shore

The number of wave crests passing a point each second

Question 16 of 20

17. What does wave period refer to?

The distance between two consecutive troughs

The time required for a wave crest at one point to reach another point

The highest vertical height reached by a tsunami

The number of waves formed during a storm

Question 17 of 20

18. Why are waves called coastal architects?

They determine the political boundaries of coastal countries.

They prevent all forms of coastal erosion.

They shape coastlines through erosion and sediment transport.

They create tides by attracting the Moon.

Question 18 of 20

19. Which coastal landform can develop when a crack in a headland is enlarged by wave action?

Sea Cave

Abyssal Plain

Continental Shelf

Ocean Trench

Question 19 of 20

20. How is a sea arch formed?

By the deposition of sand in deep water

By the collapse of an abyssal plain

By the movement of the continental shelf

When erosion enlarges a sea cave through a headland

Question 20 of 20

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