physics

1. Tony is standing on a table. Which of the following pairs of forces is/are
(an)action and reaction pair(s)?

(1) The force exerted by Tony on the table and the normal reaction exerted
by table on Tony.
(2) The weight of Tony on the table and the normal reaction exerted by the
table on Tony.
(3) The force exerted by the table on the ground and the gravitational force
exerted by the earth on the table.

A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only

2. Vic Chan is standing on an electronic balance (in Newton scale) in a
lift which is moving upward. At a certain instant, the reading of the
balance is 678.6N. Mass if Vic Chan is 60 kg. Which of the following
statements is/are correct?

(1) The balance exerts a force of 678.6N on Vic Chan.
(2) The gravitational force acting on Vic Chan is 678.6 N.
(3) Vic Chan is moving upwards with an accelerating of 1.5 ms^-2.

A. (1) only
B. (1) and (2) only
C. (2) and (3) only
D. (1) and (3) only

A man is standing in a lift. The lift is initally at rest. When the lift starts to
move upward, the man feels heavier. Which of the following statments is/are
correct ?
(1) The gravitational force acting on the man increases.
(2) The gravitational force acting on the lift increases.
(3) The force acting on the man by the floor of the lift increases.

A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only