Heat from the sun reaches earth by the process of
1). Conduction
2). Convection
3). Radiation
4). All of the above
2. Propagation of sound can be visualised as propagation of ________ variations in the medium
3. Purpose of an optical filter is to
4. Light from Sun reaches Earth in approximately
6. Which of the following is biodegradable?
7. It takes much longer to cook food in the hills than in the plains, because
8. Alternating current is converted into direct current by a
9. A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
10. The motion of a freely falling body is an example of ________ accelerated motion.