Tag: hydro electricity

Questions Related to hydro electricity

As the water is released through control valves, _____ of water changed to ____ .

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  1. Rotational energy, potential energy

  2. Kinetic energy, potential energy

  3. Potential energy, rotational energy

  4. Rotational energy, thermal energy

Show answer
Correct Option: C
Explanation:

As the water is released through control valve, the potential energy of water changes to kinetic energy. As the water flows into reservoir from the catchment area, the kinetic energy of flowing water changes to potential energy.

Which of the following is not a purpose to build dams?

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  1. Prevent flooding of the rivers in the area.

  2. To prevent flooding of the rivers in the area.

  3. To generate hydroelectricity.

  4. None of the above.

Show answer
Correct Option: D
Explanation:

The dams are constructed for the following purposes:
a) To prevent flooding of the rivers in the area.
b) To provide water for irrigation purposes.
c) To generate hydroelectricity.

Which of the following is not a disadvantage of building large dams?

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  1. A vast variety of flora and fauna get submerged

  2. Dams can base dangers of earthquake

  3. Human settlement get submerged by stored water

  4. Provide water for irrigation process

Show answer
Correct Option: D
Explanation:

Providing water to irrigation process is an advantage of creating dam.

Which of the following is an advantage of building dams?

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  1. The dams disturbs aquatic life

  2. Dams lead go large scale disturbance of aquatic life

  3. It disturbs the natural ecosystem

  4. None

Show answer
Correct Option: D
Explanation:

The dams across the Rivers can disturb the aquatic life and can lead to their large scale destruction the fishes and other water animals may enter the power generation turbines where they may get crushed.

Which of the following is not a disadvantage of building large dams for generating hydro electric power?

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  1. Disturbance of the natural ecosystem in the surrounding forest area.

  2. Disruption of the plants and animals life.

  3. Displacement of people on a large scale.

  4. None of the above.

Show answer
Correct Option: D
Explanation:

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) Disturbance of the natural ecosystem in the surrounding forest area.

B) Disruption of the plants and animals life.

C) Displacement of people on a large scale.

D) Disruption of the aquatic ecosystem.

Which of the following is / are disadvantage of building large dams for generating hydro electric power?

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  1. Due to construction of dams, lot of areas of rivers having continuous fresh flowing water, have to be cleared.

  2. Number of trees have to be cut.

  3. Destroys not only the plants life but also the animals and birds life dependent on them.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main disadvantages:

A) disturbance of the natural ecosystem in the surrounding forest area.

B) disruption of the plants and animals life.

C) displacement of people on a large scale.

D) disruption of the aquatic ecosystem.

At present, the contribution of hydroelectricity to the total power generation in India is

biology structure of earth electricity from water energy hydro electricity hydro energy

  1. A little more than $22$%

  2. A little more than $35$%

  3. A little more than $47$%

  4. None of these

Show answer
Correct Option: A

Fill in the blank space by choosing the correct word.
Water stored in the reservoirs of hydro-electric dams has ................. energy.

physics structure of earth electricity from water energy hydro electricity hydro energy

  1. $tidal$

  2. $fossil$

  3. $potential$

  4. $biomass$

Show answer
Correct Option: C
Explanation:

Potential energy is stored energy or the energy of position. The potential energy stored in a body of water held at a given height is converted to kinetic energy (movement energy) which is used to turn a turbine and create electricity.
Hence, water stored in the reservoirs of hydro-electric dams has potential energy.

Construction of dams

physics sources of energy electricity from water energy hydro electricity hydro energy

  1. Is always an advantageous process

  2. Has only disadvantages

  3. Both

  4. None

Show answer
Correct Option: C
Explanation:

The construction of dams for generating hydro electric power and then installation of transformers and their connection to the national grid has the following four main advantages:

A) disturbance of the natural ecosystem in the surrounding forest area

B) disruption of the plants and animals life

C) displacement of people on a large scale

D) disruption of the aquatic ecosystem.

So,construction of dams is not always advantageous.

Arrange the following steps in the conversion of hydel energy to electricity in a proper sequence.
(a) Released water is made to fall on the blades of the turbines.
(b) Water in the dam is released.
(c) Water is collected in the dam.
(d) Potential energy is converted to kinetic energy.
(e) The armature of the electric generator rotates to produce electricity.

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  1. b c d e a

  2. a d b c e

  3. e c d b a

  4. c b d a e

Show answer
Correct Option: D
Explanation:

Initially water is collected in the dam. When it is released, the potential energy is converted to kinetic energy. The released water is made to fall on the blades of turbines. The armature of the electric generator rotates to produce electricity.