1.
1
2.
pull
3.
Because needle tip has very less area of cross section in comparison to finger. Needle tip will exert more pressure than finger on the balloon.
4.
Option B
5.
Option A
6.
fluids
7.
Option A
8.
Option A
9.
Option C
10.
Option C
11.
Option A
12.
Option C
13.
Because of air pressure on the walls of tube.
14.
Option D
15.
At high altitudes, the atmospheric pressure becomes much less than our blood pressure. Hence, some of the blood vessels in our body burst and nose bleeding take place at high altitudes.
16.
Broad straps help to increase the increase the area of contact of the bag with the shoulder. So, the pressure on the shoulder is reduced and it is easier to carry the bag.
17.
monometer
18.
Option D
19.
(i) Muscular force acting upward (ii) Gravitational force acting downward
20.
effect, cause
