Which of the following sources of energy is different from the other?

Write true or false for the following statement:
Glass cover in a solar heating device allows the short wavelength of ultraviolet radiations to enter the solar cooker.

In which forms is solar energy stored in the oceans? Mention any two forms that could be harnessed to obtain energy in a usable form.

What are hot spots inside the Earth's crust?

Draw a labelled diagram of a floating gas holder type biogas plant and describe its working. Mention any two advantages of using animal dung for making biogas over using it as a fuel in the form of dried dung cakes.

Mention any four areas where solar cells are being used as a source of energy.