Question

Answer question numbers 4(a) to 4(d) on the basis of your understanding
of the following paragraph and the related studies concepts.
The Tehri dam is the highest dam in India and one of the highest in the
World. The Tehri dam withholds a reservoir of capacity 4.0 km and
surface area 52 km². It is used for irrigation, municipal water supply and
the generation of 1000 MW of hydro electricity.
The Tehri Dam has been the object of protests. Environment activist Shri
Sunder Lal Bahuguna led the "Anti Tehri Dam Movement" from 1980s to
2014. The protest was against the displacement of town inhabitants and
environmental consequences of the weak ecosystem. The relocation of
more than 1,00,000 people from the area has led to protracted legal
battles over resettlement rights and ultimately resulted in the delayed
completion of the project.
(a) How is hydropower harnessed ?
(b) Define 1 MW.
(c) Mention two disadvantages of constructing Tehri Dam.
(d) What happens when water from great heights is made to fall on
blades of turbine ?​

Answer 1

The correct answers are -

a) Hydro - power is harnesses after water is collected in a reservoir, which is behind the dam. The stored water is then released to turn a turbine in order to produce the electricity.

b) 1 MW is equal to 1000000 W

c) Two disadvantages of Tehri dam are -

• It has resulted in large scale destruction of the biodiversity in catchment areas.
• It has also led to a large scale displacement of people.

d) When water from great heights is made to fall, the blades of turbine move and there is a conversion of kinetic energy of water into the electric energy.