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Subject :NSO    Class : Class 8

In which of the following activities is work done

(A) A boy shaking a tree

(B) Ali pushing against the wall

(C) A man pushing a stalled car

(D) A worker pushing a loaded car.
In options C and D, it is not indicated whether the car has moved or not. How do I then understand as to whether work has been done or not?

Ans 1:

Class :
Venus is the hottest planet even though Mercury is the closest planet to the Sun. The reason that Venus is hotter than Mercury is because it has an atmosphere made of carbon dioxide; it also has clouds of acid inside its atmosphere. This is called greenhouse effect.

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