Rachna Sapra solutions for जिओग्राफी [अंग्रेजी] कक्षा ९ आईसीएसई chapter 10 - Hydrosphere [Latest edition]

Which one of the following ocean currents flows in the Atlantic Ocean?

Which of the following is a warm ocean current?

An exceptionally high tide reflects which phase of the moon?

Tides take place due to ______.

Coriolis force comes into action due to ______.

Which of the following factors affect the movement of the ocean currents?

Gulf Stream flows along ______.

What is a gyre?

Due to Coriolis effect, the ocean currents get deflected towards their right hand side in ______.

The average temperature of ocean water is ______.

Which of the following is an example of vertical movement of the ocean waters?

What percentage of water is found as ground water?

Average salinity of ocean water is ______ parts of salt in 1,000 parts of water.

Which of the following types of tides will be experienced on the New Moon?

A ship is waiting in the deep waters. It is waiting for the next high tide so that it can enter the harbour of the port. Can you guess which of the following ports it is waiting to enter?

Which of the following statements does not reflect a significance of tides?

Identify the ocean current from the information given below.

• It is a cold current.
• It flows in the North Atlantic Ocean.
• It develops rich fishing ground when it meets the warm Gulf Stream.

Assertion (A): Salinity of Caspian Sea is higher than that of the Pacific Ocean.

Reason (R): Caspian Sea is an enclosed sea while the Pacific Ocean is an open ocean.

Assertion (A): The temperature of surface water is higher than the temperature at the bottom of the ocean.

Reason (R): The unequal heating sets up conventional currents in the water bodies.

Assertion (A): As the waves approach the shore, they slow down.

Reason (R): The force of friction acts between the wave and the sea floor.

Assertion (A): Every water body experiences high tide and low tides.

Reason (R): The gravitational pull of the Sun causes the water to rise up.

Assertion (A): Cold currents move towards the poles.

Reason (R): The ocean currents are caused due to the differential heating by the solar energy.

Read the given passage and answer the following questions.

1. Are the tides an example of horizontal or the vertical movement of ocean water?
2. Why are the tides often referred to as the periodic movement of ocean water?
3. How do people in the coastal area record time according to the rise and fall of the tides?

What are ocean currents?

Name a few important ocean currents of the Pacific Ocean.

Name two horizontal movements of ocean water.

Define the following term:

Spring tide

Define the following term:

Neap tide

Mention the factors affecting ocean currents and their circulation.

What is gyre?

How does the salinity of ocean water affect the ocean currents?

What are tides?

Name the two forces responsible for causing the tides.

Mention the time difference between two high tides.

“Ocean waters are always in motion.” Name the different movements of ocean water.

In what ways warm ocean currents are different from cold ocean currents?

“The ocean water is saline and not fit for human consumption.” What does the term salinity of ocean water mean? What is the average salinity of ocean water?

How is the movement of ocean current influenced by the prevailing winds?

Why the ocean currents of Southern Hemisphere flow in anticlockwise motion?

Name the important ocean currents of Atlantic Ocean.

What is Coriolis Effect?

How does the coriolis effect affect the ocean currents?

Name the cold ocean current which affects the fishing industry of Japan.

Discuss the significance of tides.

Define the term tidal range.

How is the neap tide different from the spring tide?

“Water can neither be created nor destroyed”. Do you agree with the statement? Justify.

How are the waves different from the tides?

How does Gulf Stream current originate?

How it forms dense fog at the coast of Newfoundland?

List two prime impacts of ocean currents.

Draw a well labelled diagram of spring tide.

Draw a well labelled diagram of neap tide.

Give a reason for the following: 

Warm currents produce a milder climate.

Give reasons for the following:

Each day a tide is delayed by 26 minutes.

Name the ocean currents which are responsible for bringing rainfall to the following places.

British Isles, British Columbia, Japan, Australia, South Eastern coast of Africa

What is common about these ocean currents?

The Atacama Desert in South America and the Kalahari desert in Africa receive very little rainfall due to the effect of ocean currents. Name the ocean currents responsible for this. Also mention the common features between the two currents.