Dams

Q.

Hydroelectric energy is non-renewable, since water that flows down, cannot be used

1. True
2. False

Q.

(a) State the advantages of constructing dams across the rivers?
(b) Describe some of the problems associated with the construction of dams.

Q.

What is a dam? Why do we seek to build large dams ? While building dams which three main problems should be addressed to maintain peace among people ?

Q.

The 'Narmada Bachao Andolan' protests are against raising the height of which dam?

1. Mahatma Gandhi

2. Sardar Sarovar

3. Pandit Jawaharlal Nehru

4. None of These

Q.

Which is the country having the largest number of hydroelectric dams?

1. China

2. Netherlands

3. USA

4. India

Q.

Write two causes for the failure of sustained availability of groundwater?

Q.

What happens when water from great heights is made to fall on blades of turbine?

Q. What is the working mechanism of a dam in hydro-power plants?

1. Dams convert potential energy of water stored in the dam to kinetic energy when doors of the dam are opened and then to electrical energy with the help of turbine.
2. Dams convert kinetic energy of flowing water inside the dam to potential energy when doors of the dam are opened and then to electrical energy with the help of turbine.
3. No energy conversion occurs.
4. Dams convert electrostatic energy of flowing water inside the dam to potential energy when doors of the dam are opened and then to electrical energy with the help of turbine.

Q.

How do humans affect transpiration?

Q.

Name the rivers with which of the following dams are associated:
(a) Tehri Dam
(b) Sardar Sarovar Dam
(c) Bhakra Dam

Q.

Indira Gandhi Canal has brought greenery to

1. Bihar

2. Rajasthan

3. Karnataka

4. Andhra Pradesh

Q.

How many important problems did the 'Narmada Bachao Andolan address' regarding the construction of the Sardar Sarovar dam?

__

Q.

It is important to make small check dams across the flooded gullies because they

1. hold water for irrigation.
2. hold water and prevent soil erosion.
3. recharge groundwater.
4. hold water permanently.

1. (i) and (iv)

2. (ii) and (iii)

3. (iii) and (iv)

4. (ii) and (iv)

Q.

The maintenance of lakes and ponds is essential for

1. Recycling of water

2. Increasing water table

3. Increasing soil fertility

4. Increasing surface water runoff

Q.

What is bio mass?

Q.

Question 4
In a hydro power plant
(a) Potential energy possessed by stored water is converted into electricity.
(b) Kinetic energy possessed by stored water is converted into potential energy.
(c) Electricity is extracted from water.
(d) Water is converted into steam to produce electricity.

Q.

Floods can be prevented by

1. afforestation

2. removing top soil

3. deforestation

4. agriculture

Q. When plants get submerged in water and decay, large amount of is produced.

1. Chlorine
2. Methane
3. Fluorine

Q. Sardar Sarovar dam was built on

1. Ganga
2. Savitry
3. Narmada
4. Godavari

Q.

Why are we looking at wind as a source of energy now?

Q.

What are the traditional uses of wind energy?

Q. Why hydro power plants are associated with dams?

Q. On which river, Sardar Sarovar hydroelectric power station is located?

1. Mahi
2. Narmada
3. Tapi
4. Sabarmati

Q. Why is biogas a better fuel than animal dung cakes?

Q. Which of the following is built across the flooded gullies ?

1. Wall
2. Check dams
3. Tank
4. Khadins

Q. 'Narmada Bachao Andolan' is related to the construction of ________ Dam.

1. Damodar
2. Tehri
3. Sardar Sarovar
4. Maithon

Q.

Mention two ecological effects of dams?

Q.

Which structure is used for the purposes of water storage and irrigation?

__

Q.

Give two advantages and two limitations of a windmill.

Q. Which of the following are disadvantages of hydro power plant?

1. Dams can be constructed only in a limited number of places.
2. Methane is released contributing to green house effect
3. Large areas of agricultural land and human habitation are sacrificed
4. All of above