# Fluids MCQs

#### The buoyant force on a body completely immersed in a fluid is independent of ____.

Correct! Wrong!

The buoyant force on a body depends upon the weight of the displaced fluid and is independent of density and shape of the body. The weight of the fluid displaced depends on volume of the fluid displaced and the density of the fluid. When the body is completely immersed in the fluid, volume of the fluid displaced is equal to the volume of the body.

#### The up thrust on a body depends upon ____.

Correct! Wrong!

Upthrust = volume of the body immersed × density of liquid × acceleration due to gravity

#### Up thrust by the fluid depends on the density of the body.

Correct! Wrong!

Up thrust does not depend upon the density of the body.

#### A puncture in a cycle tube ____.

Correct! Wrong!

Puncture in a cycle tube deflates it and is an example of decreasing pressure.

#### Two bodies A and B are having volumes in the ratio 2 : 3. The ratio of the thrusts exerted on them, when the two bodies are immersed in a liquid is ____.

Correct! Wrong!

Thrust exerted on a body, F = Vdg As the A and B are immersed in the same liquid, F ∝ V Hence, the ratio of the thrusts exerted on them is 2 : 3

#### The basic concept in pressure cooker is to cook food, at high temperature and pressure in relatively less time.

Correct! Wrong!

At high pressure, boiling point of water increases, as a result food is cooked quickly in pressure cooker.

#### It is easier to swim in sea water than in river water.

Correct! Wrong!

It is easier to swim in sea water than in river water as density of sea water is more than that of river water. There is more up thrust in sea than in river water.

#### The concentration of acid is measured in a battery through a ____.

Correct! Wrong!

The concentration of acid is measured in a battery through a hydrometer.

#### The lateral pressure exerted by a liquid ____ the depth of the liquid.

Correct! Wrong!

The lateral pressure exerted by a liquid increases with an increase in the depth of the liquid.

#### When a body is immersed wholly or partially in a liquid it loses some of its weight equivalent to the up thrust. This statement was given by ____.

Correct! Wrong!

According to Archimedes principle, when a body is immersed wholly or partially in a liquid, it loses some of its weight equivalent to up thrust.

#### Maximum upward buoyant force acts on the object when it is partially immersed in a liquid.

Correct! Wrong!

Maximum upward buoyant force acts on the object when it is completely immersed in a liquid.

#### A wind is caused due to pressure difference.

Correct! Wrong!

Wind blows from higher pressure area to lower pressure area. Hence, wind is caused due to pressure difference.

#### The same magnitude of force is applied to two objects A and B. If area of A is more than that of B, then the pressure on____.

Correct! Wrong!

Pressure is inversely proportional to area. Area of A is more than area of B. Hence, the pressure on A is smaller than pressure on B.

#### When air is removed from a can, the can gets squeezed.

Correct! Wrong!

When air is removed from a can, it gets squeezed due to the force exerted by atmospheric pressure on it.

#### The study of fluid includes ____.

Correct! Wrong!

The study of fluids includes liquids and gases.

#### The natural flow of fluids is always from low pressure to high pressure.

Correct! Wrong!

The natural flow of fluids is always from high pressure to low pressure.

#### A barometer is used to measure the atmospheric pressure while manometer measures ____.

Correct! Wrong!

Manometer measures both gauge pressure and pressure difference.

#### Pressure does not depend on the area on which force acts.

Correct! Wrong!

Pressure depends on the area on which force acts. More the area, less the pressure.

#### The working of hydrometer is based on the ____.

Correct! Wrong!

The working of hydrometer is based on the theory of floatation.

#### While floating the weight of the body is equal to the up thrust.

Correct! Wrong!

While floating the weight of the body is equal to the up thrust.

#### A block of wood is floating in a lake. The apparent weight of the floating block is ____.

Correct! Wrong!

For a floating block, up thrust is equal to the weight of the block. Hence, apparent weight will be zero.

#### Pressure due to a liquid column does not depend on ____.

Correct! Wrong!

Pressure due to a liquid column is given as the product of height, density and acceleration due to gravity. Hence, pressure due to a liquid column does not depend on the mass of the liquid.

#### When a body is wholly or partially immersed in a liquid it appears to lose weight. This loss of weight is equal to the weight of liquid displaced by the body.

Correct! Wrong!

Archimedes principle:- When a body is wholly or partially immersed in a liquid it appears to lose weight. This loss of weight is equal to the weight of liquid displaced by the body.

#### The force acting on a unit area of a surface is called ____.

Correct! Wrong!

The force acting on a unit area of a surface is called pressure.

#### Buoyant force is equal to the ____.

Correct! Wrong!

According to Archimedes principle, buoyant force is equal to the weight of the liquid displaced.

#### The instrument used to measure atmospheric pressure is known as ____.

Correct! Wrong!

The instrument used to measure atmospheric pressure is known as barometer.