INTRODUCTION: Fluid in Motion and Continuity Equation

A fluid in motion can be either a liquid or a gas.

• True
• False

Answer explanation

Explanation: Fluids include both liquids and gases. When they move, they are called fluids in motion. Examples are flowing water and moving air.

Fluid always moves from low pressure to high pressure.

• True
• False

Answer explanation

Explanation: Fluids normally move from an area of higher pressure to an area of lower pressure.

The continuity equation is related to the conservation of mass in fluid flow.

• True
• False

Answer explanation

Explanation: The continuity equation shows that mass is conserved, meaning the amount of fluid entering a pipe must equal the amount leaving if there is no leakage.

When the cross-sectional area of a pipe becomes smaller, the fluid velocity increases.

• True
• False

Answer explanation

Explanation: According to the continuity principle, fluid moves faster in narrower sections of a pipe.

Water flowing in a wider pipe section moves faster than in a narrow section.

• True
• False

Answer explanation

Explanation: In a wider section, the fluid moves slower because there is more space for it to flow.

The unit of fluid velocity is meters per second (m/s).

• True
• False

Answer explanation

Explanation: Velocity measures how fast a fluid moves, and the SI unit is meters per second.

The continuity equation for an incompressible fluid is (A1)(V1)=(A2)(V2)

• True
• False

Answer explanation

7. Explanation: This equation shows the relationship between cross-sectional area and velocity at different points in a pipe.

A1V1=A2V2​

Air cannot be considered a fluid because it is invisible.

• True
• False

Answer explanation

Air is a gas, and gases are fluids because they can flow and take the shape of their container.

Fluid flow rate depends on the area of the pipe and the fluid velocity.

• True
• False

Answer explanation

Explanation: A larger area or higher velocity increases the amount of fluid flowing per second.

In fluid motion, particles of fluid always remain completely stationary.

• True
• False

Answer explanation

Explanation: In fluid motion, fluid particles move from one place to another due to pressure differences or external forces.