MCQ Chapter 1 Oceans and Life Class 9 Social Science CBSE

1. What is hydraulic action?

The production of electricity using tides

The erosion of rock and soil by the force of moving water

The movement of ocean water caused by temperature differences

The formation of underwater mountains through volcanic activity

Question 1 of 20

2. Which of the following is a depositional landform created by waves?

Sea Cave

Sea Stack

Beach

Sea Arch

Question 2 of 20

3. What are tides?

The rhythmic rise and fall of ocean water

The continuous flow of water in a definite direction

Waves caused only by underwater earthquakes

The movement of sand along a beach

Question 3 of 20

4. What is a high tide?

The time when ocean water completely disappears from the shore

The lowest level of the ocean near the coast

The continuous flow of water away from the coast

The stage when ocean water reaches its highest level and covers much of the shore

Question 4 of 20

5. What is a low tide?

The highest level reached by ocean water

The stage when water falls to its lowest level and moves away from the shore

A very large wave caused by an earthquake

A warm current moving towards the coast

Question 5 of 20

6. When do spring tides occur?

When the Sun and Moon act at right angles

Only during the first-quarter Moon

When the Sun, Earth and Moon are aligned during the full or new Moon

When ocean currents stop moving

Question 6 of 20

7. Why are spring tides associated with a greater tidal range?

The gravitational effects of the Sun and Moon combine to produce more extreme high and low tides.

The Moon stops exerting any gravitational force on Earth.

Ocean currents completely disappear during the full Moon.

Winds become the only cause of tides.

Question 7 of 20

8. When do neap tides occur?

Only when the Sun, Earth and Moon form a straight line

Only during the new Moon

When the ocean experiences a tsunami

During the first-quarter and third-quarter Moon phases

Question 8 of 20

9. What happens to the tidal range during neap tides?

It becomes extremely large.

It becomes smaller.

It remains permanently at zero.

It becomes unrelated to the Moon.

Question 9 of 20

10. Why are high tides useful for navigation?

They eliminate the need for ports.

They prevent all ocean currents from forming.

They increase water depth near the shore, allowing ships to enter harbours more easily.

They make every underwater trench shallow.

Question 10 of 20

11. Which Indian region has one of the highest tidal ranges, at about 12 metres?

Gulf of Khambhat

Arabian Sea near Alappuzha

Bay of Bengal near Chennai

Andaman Sea

Question 11 of 20

12. Why may Very Large Crude Carriers wait for high tide before passing through shallow sea channels?

To avoid encountering all marine organisms

To make the ocean currents disappear

To benefit from stronger winds alone

To ensure sufficient water depth and avoid running aground

Question 12 of 20

13. How can high tides benefit fishing communities?

They remove all fish from coastal waters.

They may bring fish closer to the shore in search of food and shelter.

They prevent fishing boats from reaching coastal waters.

They convert salt water into fresh water.

Question 13 of 20

14. Which of the following is identified as a major tidal energy site in India?

Thar Desert

Deccan Plateau

Gulf of Kutch

Himalayan Mountains

Question 14 of 20

15. What are ocean currents?

Continuous streams of water flowing across the ocean surface in definite directions

Temporary waves produced by strong winds

The daily rise and fall of sea level

Deep valleys in the ocean floor

Question 15 of 20

16. Which of the following is a factor responsible for the movement of ocean currents?

The height of coastal buildings

The number of ships in a harbour

The colour of ocean water

Differences in water temperature and salinity

Question 16 of 20

17. What is the Coriolis force?

A force that produces waves only during storms

A force caused by Earth's rotation that deflects moving objects

A force that stops ocean currents near the equator

A force that makes tides occur only once a month

Question 17 of 20

18. How are warm ocean currents generally identified?

They always flow towards the ocean floor.

They originate only in polar regions.

They flow from warmer regions and are usually shown in red on maps.

They are always shown in blue on maps.

Question 18 of 20

19. Which statement correctly describes cold ocean currents?

They carry water from colder regions and are usually shown in blue on maps.

They always originate in warm tropical regions.

They are responsible for every high tide.

They flow only around islands in the Pacific Ocean.

Question 19 of 20

20. Which warm ocean current originates in the Gulf of Mexico?

Labrador Current

Canary Current

Benguela Current

Gulf Stream

Question 20 of 20

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