If not wearing a special protective suit you would start bleeding on moon This is because of ........

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If not wearing a special protective suit, you would start bleeding on moon. This is because of

Zero air pressure at moon

Extreme heat on the surface of moon

Low gravity

Radiation coming from the moon

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Explanation:

The air pressure is zero at Moon. If astronauts did not wear these space suits, the counter pressure exerted by the body of the astronauts would make the blood vessels burst. The astronauts would bleed.
Option (c) is incorrect as the air in the suit will not protect them against the effects of gravity. The astronauts can float even after wearing protective suits.
Moon’s surface does not emit any harmful radiation as such. So, option (d) is wrong.