Mechanical Properties of Fluids

The pressure inside a soap bubble is:

1. Equal to outside pressure
2. Less than outside pressure
3. Greater than outside pressure
4. Zero

The force responsible for keeping a needle floating on water is:

1. Gravitational force
2. Surface tension
3. Magnetic force
4. Friction

The Reynolds number is used to determine:

1. Pressure of fluid
2. Type of fluid flow
3. Density of fluid
4. Surface tension

A body floats in a liquid when:

1. Its density is greater than liquid density
2. Its density is equal to or less than liquid density
3. Its mass is zero
4. It has no volume

The velocity of fluid flow increases when the cross-sectional area of a pipe:

1. Increases
2. Decreases
3. Remains constant
4. Becomes zero

Bernoulli's theorem is based on conservation of:

1. Mass
2. Energy
3. Charge
4. Momentum only

The excess pressure inside a liquid drop is:

1. 2T/r
2. T/r
3. 4T/r
4. Tr

Surface tension of a liquid is due to:

1. Gravitational force
2. Cohesive forces between molecules
3. Magnetic force
4. External pressure only

The SI unit of coefficient of viscosity is:

1. Pa s
2. N/m
3. J/s
4. kg/m²

The viscosity of a fluid depends on:

1. Temperature
2. Shape of container
3. Colour of fluid
4. Volume only

The density of water is maximum at:

1. 0°C
2. 4°C
3. 10°C
4. 100°C

The buoyant force acting on an immersed body is equal to:

1. Weight of the body
2. Weight of the displaced fluid
3. Mass of the body
4. Volume of the body

The pressure at a depth h below the surface of a liquid is:

1. ρgh
2. ρ/hg
3. h/ρg
4. ρg/h

According to Pascal's law, pressure applied to an enclosed fluid is transmitted:

1. Only upward
2. Only downward
3. Equally in all directions
4. Only along the surface

The SI unit of pressure is:

1. Newton
2. Pascal
3. Joule
4. Watt