Energy Resources and Storage

Geothermal energy is produced due to geological changes. Hence, option (3) is correct.

Hydropower is a renewable source of energy. Hence, option (3) is correct.

Vegetation that gets submerged and rots under anaerobic conditions produces a large amount of methane gas. Hence, option (3) is correct.

Fossil fuels are a non-renewable source of energy. 

We depend mostly on fossils (coal and petroleum) for our energy requirements. The use of coal as an energy source revolutionised the industrial world, which further led to a better quality of life all over the world. Growing demand of energy due to increasing population is basically fulfilled by the use of fossil fuels, i.e. coal and petroleum. Hence, option (1) is correct.

The water stored in a dam possesses only potential energy. It does not have kinetic energy since stored water has zero velocity, i.e. kinetic energy is the wrong option.

Yes, it is correct. Both 1 and 2 are true.

Geothermal energy is a renewable source because it comes from the Earth's internal heat, which is continuously replenished through radioactive decay in the Earth's core. Unlike coal, natural gas, and uranium which are finite and non-renewable, geothermal energy is sustainable as long as the Earth's internal heat persists.

Solar energy is a renewable energy source because sunlight is continuously available and cannot be depleted. Coal, petroleum, and natural gas are non-renewable fossil fuels formed over millions of years that will eventually run out.

Solar power can be used for space heating (through solar thermal collectors or passive solar design), water heating (solar water heaters are common worldwide), and various other applications. However, navigation (using GPS, maps, or celestial navigation to determine position and direction) is not directly powered by solar energy - it requires electronic systems, satellites, or manual methods. While solar panels can power navigation equipment, the process of navigation itself is not an application of solar power. The question asks what cannot be done BY solar power (as an energy source), making navigation the correct answer.

Ground water is a renewable source of energy.

Solar energy cannot be used on a cloudy day as it requires sunlight for its operation.

The wind speed should be more than 15 km/hr to maintain the required speed of the turbine.

Natural gas is the second major energy source globally after oil, accounting for approximately 24% of world energy consumption. It is used for electricity generation, heating, and industrial processes. Coal ranks third, while bio gas represents a much smaller fraction of global energy supply.

In energy classification, conventional sources refer to those used traditionally for a long time, like coal, petroleum, natural gas, and hydroelectricity. Non-conventional or renewable sources include solar, wind, geothermal, tidal, and biogas. Among the options, only hydroelectricity is classified as conventional, while geothermal, biogas, and solar are non-conventional sources.