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Sam’s father and mother are astronauts. Last month they returned from a tour to moon. Sam’s father told him that they had air filled helmet and it also had microphone, which they used for talking to each other. But his mother was not able to listen to him when they opened their helmets. (Assume they were wearing oxygen masks when they opened their helmets). What is the reason?

There is no atmosphere on the moon. Sound needs a medium to travel and since there is no air, sound cannot travel. So his mother was not able to... View Article

Choose the correct option. Statement 1: The shape of the moon changes everyday and the various shapes seen during a month are called phases of the moon.   Statement 2: Moon has no light of its own. We see only that part of moon, which reflects light of the sun to us. The position of moon changes due to its revolution around earth and hence the portion of moon reflecting the light of sun to us.

The moon does not produce its own light, whereas the Sun and other stars do. We see the moon because the sunlight falling on the moon gets... View Article