Hydel Energy

Q. What kind of energy conversion takes place in hydropower plants?

1. Kinetic - Potential - Electrical
2. Potential - Kinetic - Electrical
3. Kinetic - Chemical - Electrical
4. Chemical - Potential - Kinetic

Q. Statement 1: Dams are constructed to produce hydro electricity.
Statement 2: Dams obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

1. Statement 1 and statement 2 are correct , statement 2 is the correct reason for statement 1.
2. Statement 1 and Statement 2 are correct, statement 2 is not the correct reason for statement 1.
3. Statement 1 is correct and statement 2 is incorrect.
4. Both statements are incorrect.

Q. Statement 1: Production of hydro electricity is one of the many uses of construction of dams.
Statement 2: Dam obstruct the flow of water and water level rises thereby increasing the potential energy which is further converted to kinetic and then to electric energy.

1. Statement 1 and Statement 2 are correct, statement 2 is not the correct reason for statement 1.
2. Statement 1 is correct and statement 2 is incorrect.
3. Statement 1 and statement 2 are correct, statement 2 is the correct explanation of statement 1.
4. Both statements are incorrect.

Q.

Statement 1: Dams are constructed to produce hydro electricity.

Statement 2: Dams obstruct the flow of water and water level rises, thereby increasing the potential energy which is further converted to kinetic energy, and then to electrical energy.

1. Statement 1 is correct and statement 2 is incorrect

2. Statement 1 and Statement 2 are correct, But statement 2 is not the reason for statement 1

3. Statement 1 and statement 2 are correct , statement 2 is the reason for statement 1

4. Both statements are incorrect

Q. A windmill is a machine that converts wind energy to rotational energy.

1. False
2. True

Q. Which of these are the disadvantages of hydropower generation?

1. Dams can be constructed only in limited areas.
2. Large areas of land get submerged in water when dams are constructed.
3. Submerged vegetation rots under anaerobic conditions and produces methane, a greenhouse gas.
4. None of these

Q. A ball is placed on a compressed spring. On releasing the spring, the ball flies away. Then which of the following is true?

1. The ball creates its own kinetic energy
2. Elastic potential energy of the spring is destroyed and kinetic energy of the ball is created
3. Elastic potential energy of the spring gets converted into kinetic energy of the ball
4. Potential energy of the ball is destroyed and kinetic energy of the spring is created

Q.

Identify the energy resource and the corresponding energy change shown in the figure below.

1. Tidal energy, Potential energy $\to$ Kinetic energy

2. Hydel energy, Potential energy $\to$ Kinetic energy

3. Tidal energy, Kinetic energy $\to$ Potential energy

4. Hydel energy, Kinetic energy $\to$ Potential energy

Q. Question 8
Water stored in a dam possesses

(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Q.

Which of the following statement is true regarding hydropower plants?

1. Kinetic energy possessed by the stored water is converted into potential energy.

2. Electricity is extracted from the water.

3. Water is converted into steam to produce electricity.

4. The potential energy possessed by the stored water is converted into electricity.

Q. We know that there are many advantages associated with using hydel power generation but still governments face lots of challenges. what could be possible challenges among following?

1. Displacement of tribal people.
2. Loss of forests, flora and fauna.
3. Due to structural defects or faulty design of the dam may cause sudden dam failure leading to collapse, floods and destruction to life and property.
4. Loss of agricultural land which leads to unemployment.

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. 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.
4. No energy conversion occurs.

Q. What kind of energy conversion takes place in hydropower plants?

1. Kinetic - Potential - Electrical
2. Kinetic - Chemical - Electrical
3. Chemical - Potential - Kinetic
4. Potential - Kinetic - Electrical

Q. Which of the following are the disadvantages of hydel power generation?

1. Clean electricity with minimal pollution.
2. Comparatively less maintenance cost.
3. Rehabilitation of people.
4. Renewable source of energy.