Samacheer Kalvi Class 9 Science Fluids Questions - 1

Question: 1

The one atmospheric pressure is equal to

(A) 10.13 × 10³ Pa

(B) 1.013 × 10³ Pa

(C) 10.13 × 10⁵ Pa

(D) 1.013 × 10⁵Pa

Question: 2

Aircraft that fly at high altitudes must be pressurized due to

(A) High air pressure

(B) Moderate at pressure

(C) Low air pressure

(D) None of these

Question: 3

An iron piece and a wooden piece have equal weights in air. If they are removed from air to vacuum

(A) There is no change in the weight of either

(B) The iron piece appears to weight more

(C) The wooden piece appears to weigh more

(D) None of these

Question: 4

Cartesian diver is an experiment that demonstrates the

(A) Pascal’s law

(B) Law of floatation

(C) Archimedes principle

(D) Buoyancy principle

Question: 5

Hydraulic systems working on Pascal’s law is known as

(A) Force divider

(B) Energy multiplier

(C) Multiplier

(D) Force multipliers

Question: 6

Water experts pressure on

(A) Upward direction

(B) Downward direction

(C) Lateral direction

(D) All the above

Question: 7

A bird sitting on the floor of an airtight box, which is being carried by a boy, starts flying. The boy feels that the box now

(A) Is heavier

(B) Is lighter

(C) Is lighter in the beginning and heavier later

(D) Shows no change in weight

Question: 8

In a pressure cooker, the food is cooked faster because

(A) Increased pressure lowers the melting point

(B) Decreased pressure raises the boiling point

(C) Increased pressure lowers the boiling point

(D) Increased pressure raises the boiling point

Question: 9

An empty plastic bottle closed with an airtight stopper is pushed down into a bucket filled with water. As the bottle is pushed down, there is an increasing force on the bottom. This is because,

(A) Pressure increases with depth

(B) More weight of liquid is displaced

(C) More volume of liquid is displaced

(D) All the above

Question: 10

Clouds float in atmosphere because of their low

(A) Mass

(B) Velocity

(C) Denisty

(D) Pressure