# ICSE Class 9th Physics 4 – Fluids MCQs

#### The pressure exerted by a fluid on the sides of the vessel containing it is called ____.

Correct! Wrong!

The pressure exerted by a fluid on the sides of the vessel containing it is called lateral pressure.

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

Correct! Wrong!

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

#### Atmospheric pressure decreases as we go up from sea-level due to ____.

Correct! Wrong!

Atmospheric pressure decreases as we go up from sea-level due to a decrease in the density of air as well as a decrease in the height of the air column.

#### A small hole is made at the bottom of a vessel. The speed with which water comes out of the hole depends on the height of the water column.

Correct! Wrong!

The speed with which water comes out of the hole will depend on the height of the water column. More the height of the water column, more the speed the water coming out of the hole.

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

Correct! Wrong!

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

#### 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.

#### 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.

#### 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.

#### 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.

#### The study of fluid includes ____.

Correct! Wrong!

The study of fluids includes liquids and gases.

#### 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.

#### 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.

#### When a rubber sucker is pressed on a surface it sticks to the surface and it is hard to pull it off because the ____.

Correct! Wrong!

When a rubber sucker is pressed on a surface, it sticks to the surface and it is hard to pull it off because atmospheric pressure presses it on to the surface.

#### Pressure inside an inflated balloon is greater than pressure outside.

Correct! Wrong!

Pressure inside an inflated balloon is greater than pressure outside because pressure on the concave side of a surface is greater than the pressure on the convex side.

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

Correct! Wrong!

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

#### The pressure inside a liquid is same at all points along ____.

Correct! Wrong!

Pressure at a point in a liquid depends on the height of the liquid column above it. Hence, the pressure inside a liquid is same at all points along a horizontal plane.

#### The differences in air pressure in the atmosphere create cyclones.

Correct! Wrong!

The differences in air pressure in the atmosphere create cyclones.

#### The liquid inside a container cannot exert pressure on the ____.

Correct! Wrong!

The pressure on a surface is exerted by the liquid column above it; so the liquid inside a container cannot exert pressure on the top of the container.

#### 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.

#### 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 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.

#### 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.

#### 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.

#### 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.

#### When we press the bulb of a dropper with its nozzle kept in water, air in the dropper is seen escaping in the form of bubbles. Once we release the pressure on the bulb, water rises and fills the dropper. The rise of water into the dropper is due to ____.

Correct! Wrong!

The rise of water into the dropper is due to the difference in pressure on water and the pressure inside the bulb.

ICSE Class 9th Physics 4 - Fluids MCQs
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