Mark the following activities as possible or impossible if carried out by an astronaut in a space station. (3 marks)
(A) Walking on the floor
(B) Sleeping in upright position
(C) Floating in a space station
(D) Washing their face with water from tap
(E) Pouring water in a glass to fill it completely
(F) Using an oxygen cylinder for breathing

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Solution

(A) Walking on the floor: Impossible (0.5 mark)
(B) Sleeping in upright position: Possible (0.5 mark)
(C) Floating in a space station: Possible (0.5 mark)
(D) Washing their face with water from tap: Impossible (0.5 mark)
(E) Pouring water in a glass to fill it completely: Impossible (0.5 mark)
(F) Using an oxygen cylinder for breathing: Possible (0.5 mark)

In a space station, we do not experience gravitational pull by the Earth. Hence, astronauts float in the space station. Activities like walking, pouring water in a glass, washing the face with water from tap, etc., are impossible. Astronauts tie themselves to walls or floor of the space station and sleep in any position i.e., upright or horizontal position, etc. In space one cannot directly breathe as there is no air in space. Astronauts use oxygen from the oxygen cylinder for breathing.

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