Convex mirror is generally used in _____.
1). solar cookers
2). opthalmoscope
3). reflector for head light
4). rear view mirror
1. In a water lifting electric pump, we convert
2. Heat from the sun reaches earth by the process of
4. Which of the following principle is used to produce low temperatures
5. Bolometer is used to measure
6. Which circuit is used to store one bit of data ?
8. Which type of reaction produces the most harmful radiation ?