Preeti put her hand above the flame of the candle. She could not hold her hand above the flame for more than few seconds. Whereas, when she brought her hands close to the sides of the flame, she felt the warmth of the flame and held her hands in that position for a longer time. Which of the following justifies this?
AThe candle flame always burns downwards.
BThe candle flame always burns upwards.
CThe hot air rises up.
DThe hot air spreads in all directions
★ The given diagram shows two girls playing table tennis. Amrita hit the ball over the net and at point X, Beena hit it back with a lot of force.What would happen at point X?
(A) The force caused the ball to stop moving.
(B) The force caused a change in the size of the ball.
(C) The force caused a change in the direction of the ball.
Aa and b
Ca, b and c