STD - 3, CHAPTER 10 - WATER, EXTRA QUESTIONS AND ANSWERS

1.      Mention any four activities where we use water.

Ans: Water is used for,

i)  Bathing

ii) Cooking

iii) Watering plants

iv) Cleaning purposes

2.      What are sources of water?

Ans: The places from where we get water, are called as the sources of water.

3.      Name some sources of water.

Ans: Some sources of water are rain, snow, lakes, ponds, wells, rivers, seas and oceans.

4.      Name two main natural sources of water.

Ans: Rain and snow are two main natural sources of water.

5.      Name any three inland water bodies. (OR) Name any three local sources of water.

Ans: Three inland water bodies are, lakes, ponds and rivers.

6.      From where do the rivers, lakes, ponds and wells get water?

Ans: Rivers, lakes, ponds and wells mainly get water from rain and snow.

7.      Why are picnic spots often developed around or near lakes?

Ans: Water present in the lakes is used for boating and other water-sports. So, picnic spots are often developed around or near lakes.

8.      Why rain is called as the most important natural source of water?

(OR) How rain helps in filling other water bodies?

Ans: i) Lakes, ponds and rivers get water mainly from rain.

ii) The rivers flow into a sea or an ocean.

iii) A part of the rain water goes underground.

Thus, rain is the main natural source of water.

9.      Define “ground water”.

Ans: Water, present under the surface of earth, is called ground water.

10.  How is ground water useful?

Ans: i) Ground water is used by plants for their growth.

ii) People also draw ground water and use it for different purposes.

11.   State two methods of drawing ground water.

Ans: Ground water can be drawn from the wells and by using hand pumps.

12.  Write any two importance of rain water.

Ans: i) Rain water helps in filling the other water bodies.

ii) Rain water is a natural source of irrigation for plants and crops.

13.  Why do plants look greener after rain?

Ans: Rain water washes away the dust and dust from the leaves of the plants. So, plants look greener, fresh and more beautiful after a rainfall.

14.  Name the bird which dances merrily in rain.

Ans: Peacock dances merrily in rain.

15.  Why the peacock dances in rain?

Ans: The peacock dances in rain as it enjoys the rain and feels happy.

16.  When do the mountains get a heavy snowfall?

Ans: In winters, the mountains get a heavy snowfall.

17.  How is snow a source of water?

Ans:i) During summer, when the snow melts, it changes into water.

ii) This water flows down the mountains into rivers and lakes.

Thus, snow is a source of water.

18.  Write some places which are located on the bank of a river. Also name the rivers.

PLACE	RIVER
Kolkata	Hooghly
Cuttack	Mahanadi
Patna, Kanpur, Haridwar, Varanasi	Ganga
Nasik	Godavari

 

     

 

 

19.  Name the longest river of the world.

Ans: The longest river of the world is the Nile in Egypt.

20.  Name the major rivers of North India.

Ans: The major rivers of North India are Indus, Brahmaputra, Ganga, Yamuna, Satluj, Beas and Chenab.

21.   Name the major rivers of South India.

Ans: The major rivers of South India are, Krishna, Cauvery, Godavari, Mahanadi, Narmada and Tapi.

22.  Name the water bodies surrounding India on its three sides.

Ans: India is surrounded by the Indian Ocean, Bay of Bengal and the Arabian sea, on its three sides.

23.  Name the five oceans of the world.

Ans: The five oceans of the world are, i) Pacific Ocean

ii)     Atlantic Ocean

iii)   Indian Ocean

iv)   Southern Ocean

v)     Arctic Ocean

24.  Name the water body present on the southern side of India.

Ans: The Indian Ocean is present on the southern side of India.

25.  Name the water body present on the Eastern side of India.

Ans: Bay of Bengal is present on the east side of India.

26.  Name the water body present on the western side of India.

Ans: The Arabian sea is present on the western side of India.

27.  Write one use of water in the canals.

Ans: Water in canals is used for irrigating the fields.

28.  Define “Irrigation”.

Ans: Watering the crops is called as irrigation.

29.  Define “Hydro-electricity”.

Ans: The electricity generated by using water, is called hydro-electricity.

30.  Define a dam.

Ans: A place where a large amount of river water is stored, is called a dam.

31.  How is a dam useful for generating electricity?

Ans: i) A dam stores river water in it.

ii) This stored water can be used to generate electricity.

iii) For this, the water is made to fall from a height.

32.  Name four dams in India. Also mention the state in which they are built.

Name of Dam	State	River
Tunga Bhadra Dam	Karnataka	Tungabhadra River
Gandhi Sagar Dam	Madhya pradesh	Chambal river
Gangapur Dam	Maharashtra	Godavari river
Hirakud Dam	Odisha	Mahanadi river
Govind Ballabh Pant Sagar	Uttar Pradesh	Rihand river
Tehri Dam	Uttarakhand	Bhagirathi River