There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:

Hint: Carbon causes incomplete combustion.

Wind mills require a minimum speed of

In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because:

In order to make efficient solar cooker, the cover of cooker box should be made of:

Which of the followings is not a fossil fuel?

The rise of sea-water during high tide is caused by the gravitational pull of the:

The disposal of wastes produced in a nuclear power plant is a big problem because it is:

The energy efficient device for producing light is:

The major constituent of biogas is

The process by which energy is produced in the sun is

Which is the most popular kitchen fuel in India?

Which method is used to produce electricity in hydroelectric power plant.

Which of the following is the odd one out?

Which method is used to produce electricity in thermal power plant?

Which of the following produces energy because of temperature difference at various levels in ocean.

In which of the following kinetic energy is converted into electrical energy?

Fossile fuels are

Dead organisms are transformed into petroleum and natural gas in

Which of the following problem is associated with a burning of coal?

Select the important factor for the site selection of a thermal power plant.

Hydropower plant are located in the

Which of the following organism produces biogas from cow drug sherry in the biogas plant?

Wind is caused due to

The use of reflector in the solar cooker is to

A solar panel is made by combining in an arrangement

Tidal energy is a farm of energy obtained from the

Tidal energy is harnessed by constructing a dam across

Wave energy is caused due to

The working fluid in ocean thermal power plant is

Which one of the following forms of energy leads to least environmental pollution in the process of its harnessing and utilisation?

The major problem in harnessing nuclear energy is how to

Biogas is formed in the

Solar energy can be directly converted to elec-trical energy by which of the following devices?

A device in which electricity is produced by the process of controlled nuclear fission reaction is called

Spent slurry (Bio-waste after obtaining biogas) is used as

In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

(b) The Assertion and the Reason are . correct but the Reason is not the correct explanation of the Assertion.

(c) Assertion is true but the Reason is false.

(d) The statement of the Assertion is false but the Reason is true

Assertion: Wind energy farms cannot be established every where.

Reason: The wind energy farms can be established only at those places where wind blows for most part of the year.

Coal is..

Which form of energy uses water moving through a dam?

Energy that uses heat from within the earth is ____.