An ideal fuel should have a/an -------

• Low ignition temperature

• Ignition temperature reasonably above room temperature

Name the main constituent of biogas.

• Methane

• Ethane

Which one of the following converts sunlight directly into electrical energy?

• Solar furnace

• Solar cell

Choose the correct example of a non-renewable source of energy.

• Biomass

• Natural gas

The OTEC plants can operate if the temperature difference between the water at the surface and water at depths up to 2 km is --------

 

The energy possessed by wind is ------

• Kinetic energy

• Sound energy

The fusion reactions take place at -------

• Extremely high temperatures

• Moderate temperatures

Minimum wind speed required for functioning of a windmill is about ------

• 10 km/h

• 15 km/h

Solar cells are used in ------

• All the given choices

• TV relay stations

• Traffic signals

• Calculators

To produce biogas in a biogas plant, ------- is needed.

• Water but not oxygen

• Oxygen but not water