A prediction made by a scientist based on his observations is known as

A total solar eclipse is observed from the earth. At the same time an observer on the moon views the earth. She is most likely to see ($E$ denotes the earth)

Which scientific instrument is used to record the speed of an aircraft?

Science , like any knowledge , can be put to good or bad depending on the user. Given below are some of the application of science. Formulate your views whether the particular applications is good, bad or something that cannot be so clearly categorised.

Purification of water for drinking.

Which one of the following statements is true about the ‘laws’ and ‘theories’ in science?