Which of the two persons show in figure is more likely to fall down? Which external force is responsible for his falling down?
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Which of the following physical force is responsible for ascent of sap?

Which of the following figures shows tubectomy ?

Consider the situation of the previous problem. Take the table and the ball as a system friction is then an internal force. As the ball slows down the momentum of the system decreases. Which external force is responsible for this change in the momentum?

A ball is moved on a horizontal table with some velocity. The ball stops after moving some distance. Which external force is responsible for the change in the momentum of the ball?

Which one has more significant figures

Which of the following would most likely help to slow down the greenhouse effect?

Which of the following is concave down:

Which of the following is not an example of free fall?