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Chapter: 9th Social Science : Geography: Hydrosphere

One Mark Questions Answers

I. Choose the correct answer II. Assertion (A), Reason ( R) type Questions III. Match the following : Social Science : Geography: Hydrosphere : Book Back Important Questions, Answers, Solutions : One Mark Questions Answers

Social Science : Geography

HYDROSPHERE

 

I. Choose the correct answer

 

1. The temperature of the ocean waters generally________ at greater depth.

a) increases

b) decreases

c) remains constant

d) none of the above

Answer : b) decreases

 

2. Ocean currents are produced due to

a) due to rotation of earth

b) due to variation in temperature

c) due to earth's movement

d) all the above

Answer : d) all the above

 

3. Consider the following statements.

1. Most of the fishing grounds occur in areas where the continental shelf is wide.

2. Fishing is well developed in warm tropical waters.

3. Mixing of Warm and cold currents facilitates plant nutrients for fish.

4. Inland fishing became significant in India.

a) 1 and 2 are correct.

b) 1 and 3 are correct.

c) 2,3 and 4 are correct.

d) 1,2 and 3 are correct

Answer : b) 1 and 3 are correct

 

4. The oceanic ridge comes into existence due to

a) convergence of tectonic plates

b) divergence of tectonic plates

c) lateral movements of plates

d) stearing of plates

Answer:  b) divergence of tectonic plates

 

5. Which of the following indicates the correct sequence of the topography beneath the surface of the sea?

a) Continental shelf-Continental slope-Sea plain-Sea trench.

b) Continental slope-Continental shelf-Sea plain-Sea trench.

c) Sea plain-Continental slope-Continental shelf-Sea trench.

d) Continental slope-Sea plain-Continental shelf-Sea trench.

Answer : a) Continental shelf-Continental slope-Sea plain-Sea trench

 

6. Which of the following is not correctly matched?

a) Gulf Stream — Pacific Ocean

b) Labrador current— North Atlantic Ocean

c) Canary current—Mediterranean sea.

d) Mozambique current — Indian Ocean

Answer : a) Gulf Stream-Pacific Ocean

 

II. Assertion (A), Reason ( R) type Questions

Directions:

A) Both A and R are correct and R explains A.

B) Bothe A and R are correct but R does not explain A.

C) A is correct but R is false.

D) A is false but R is correct.

 

1. Assertion (A) : Oceans are always shown in blue in maps.

Reason(R) : It indicates the natural colour of the oceans.

A) Both A and R are correct and R explains A.

B) Bothe A and R are correct but R does not explain A.

C) A is correct but R is false.

D) A is false but R is correct.

Answer : A) both A and R are correct and R explains A

 

2. Assertion (A) : Flat topped seamounts are known as Guyots.

Reason (R) : All guyot features are of volcanic origin.

A) Both A and R are correct and R explains A.

B) Bothe A and R are correct but R does not explain A.

C) A is correct but R is false.

D) A is false but R is correct.

Answer : A) both A and R are correct and R explains A

 

3. Assertion(A) : Submarine canyons are deep gorges on the ocean floor.

Reason(R) : They are mainly restricted to continental shelf, slope and rise

A) Both A and R are correct and R explains A.

B) Bothe A and R are correct but R does not explain A.

C) A is correct but R is false.

D) A is false but R is correct.

Answer : A) both A and R are correct and R explains A

 

4. Assertion (A) : Atolls are more common in the Atlantic ocean.

Reason (R) : The marine population at the depth is less.

A) Both A and R are correct and R explains A.

B) Bothe A and R are correct but R does not explain A.

C) A is correct but R is false.

D) A is false but R is correct.

Ans (c) A is correct but R is false

 

III. Match the following

 

1. Mariana trench – a. Decreases salinity in the oceans

2. Great Barrier Reef - b. Along the coast of Japan

3. Spring tides – c. Deepest point in the Pacific

4. Heavy rains – d. Australia

5. Kuroshio current – e. Second order land form

6. Continental slope - f. On full and new moon days

Answers

1. Mariana trench – Deepest point in the Pacific

2. Great Barrier Reef - Australia

3. Spring tides – On full and new moon days

4. Heavy rains – Decreases salinity in the oceans

5. Kuroshio current – Along the coast of Japan

6. Continental slope - Second order land form

 

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