Tag: sources of energy

Questions Related to sources of energy

At many places in the ocean, the different in temperatures between the water 'at the surface of ocean' and 'at deeper levels' is up to

  1. $120^0C$

  2. $80^0C$

  3. $50^0C$

  4. $20^0C$


Correct Option: D

Arrange the following steps of conversion of ocean thermal energy into electricity, in a proper sequence.
(a) The vapour of ammonia or CFC is passed over the turbines of generators.
(b) The hot water from the ocean is used to vapourise the liquid like ammonia or CFC.
(c) Cold water from the ocean depths is used to cool the vapour again into liquid.
(d) This cold liquid is again vapourised and the process continues.

  1. b a c d

  2. c a b d

  3. c b a d

  4. a b c d


Correct Option: A
Explanation:

The hot water in the ocean is used to evaporate liquids like ammonia or CFC. This vapour is used to rotate the turbines of the generator and the vapour is again cooled down to a liquid by using the cold water from the ocean depth. This cooled liquid ammonia or CFC is again vapourised and the above process continues.

Tidal energy is a major source of energy due to the presence of large water bodies on the earth.

  1. True

  2. False


Correct Option: B

_________ are used to produce energy in OTEC.

  1. Tidal energy

  2. Temperature difference between the different layers of water in ocean

  3. Ocean waves

  4. None of the above


Correct Option: B

Which of the following is not a form of oceanic energy?

  1. Energy from biomass

  2. Tidal energy

  3. Ocean thermal energy

  4. Solar energy


Correct Option: D

Energy available from the oceans is

  1. OTE

  2. Tidal energy

  3. Sea-waves energy

  4. All of these


Correct Option: D

The oceans cover almost ...... percent of the surface of earth with water and act as a vast collector of ...... energy.

  1. $71$, chemical

  2. $97$, solar

  3. $71$, solar

  4. $17$, hydroenergy


Correct Option: C

Construction of dams

  1. Is always an advantageous process

  2. Has only disadvantages

  3. Both

  4. None


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.

  1. b c d e a

  2. a d b c e

  3. e c d b a

  4. c b d a e


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.

A Wind-mill converts wind energy to _____ energy

  1. Chemical

  2. Electrical

  3. Solar

  4. Potential


Correct Option: B
Explanation:

A Wind-mill converts wind energy to electrical energy with the help of dynamo.