Question

Which of the following is not a solar heating device

• A. solar cooker
• B. solar cell
• C. solar watch
• D. biogas

Answer 1

The correct option is D

biogas

Explanation of the correct options

1. Biogas is produced by the decomposition of organic matter by anaerobic bacteria.
2. It is then used as fuel or for generating electricity.

Explanation of the incorrect options

Option (A), (B), and (C)

1. Solar heating device is a device that uses solar energy to produce electricity.
2. Solar cookers, Solar cells, and solar watches all are solar devices.

Thus, biogas is not a solar heating device.

Hence, the correct option is (D).