Tag: physics

Questions Related to physics

Pascal is the unit for

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Pressure

  2. Thrust

  3. Buoyant force

  4. None of these

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Correct Option: A
Explanation:

pascal is the SI unit of pressure

so option (A) is correct

$Pressure \times Volume=$

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. $Work$

  2. $Force$

  3. $Acceleration$

  4. None of these

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Correct Option: A
Explanation:

$Pressure=\dfrac{Force}{Area}=\dfrac{Force \times Distance}{Area \times Distance}=\dfrac{Work}{Volume}$


So, $Pressure \times Volume=Work$

Fill in the blank.

On increasing force, the pressure____________.

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. increases

  2. decreases

  3. remains constant

  4. may increase or decrease

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Correct Option: A
Explanation:

$Pressure=\dfrac{Force}{Area}$

So, on increasing force, pressure increases.

Which of the following describe $Pressure$ correctly?

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. $Pressure=\dfrac{Work}{Volume}$

  2. $Pressure=Work \times Volume$

  3. $Pressure=\dfrac{Force}{Volume}$

  4. None of these

Show answer
Correct Option: A
Explanation:

$Pressure=\frac{Force}{Area}=\frac{Force \times Distance}{Area \times Distance}=\frac{Work}{Volume}$

Unit of Pressure is a

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. direct unit

  2. derived unit

  3. complex unit

  4. none of these

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Correct Option: B
Explanation:

Unit of Pressure, $Pa$ (in SI) is derived from the units of Force ($N$ in SI) and Area ($m^2$ in SI).
$Pa=\dfrac{N}{m^2}$
So, it is a derived unit.

For constant $Pressure$

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. $Force \propto Area$

  2. $Force \propto \frac{1}{Area}$

  3. $Force \propto Area^2$

  4. None of these

Show answer
Correct Option: A
Explanation:

$Pressure=\dfrac{Force}{Area}=Constant$


$\therefore$ $Force=Constant \times Area$

Or, $Force \propto Area$

When the temperature of atmosphere rises,

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Density of air increases.

  2. Atmospheric pressure decreases.

  3. Both A and B.

  4. None

Show answer
Correct Option: B
Explanation:

With the increase in temperature, the density of atmosphere decreases, hence the atmospheric pressure decreases.

Fill in the blank.

Pressure is the force acting _________ on a unit area of object

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Perpendicularly

  2. Parallel

  3. Diagonally

  4. All

Show answer
Correct Option: A
Explanation:

Pressure is defined as force per unit area. The standard unit for pressure is the Pascal, which is a Newton per square meter.

$P=\dfrac{F}{A}$

Here the force acts perpendicularly on the area. 

As the moisture present in the air increases,

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Density if air increases.

  2. Atmospheric pressure decreases.

  3. Both A and B

  4. None

Show answer
Correct Option: B
Explanation:
The increased moisture in density suggests the decrease in its density and hence the atmospheric pressure also decreases.

Effect of a force depends on the

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Volume of the object on which the force acts

  2. Area of the object on which the force acts

  3. Displacement caused by the force

  4. None

Show answer
Correct Option: B
Explanation:

Pressure is a measure of effect of force on an object.

Pressure is defined as force per unit area, that is,
$P=\dfrac{F}{A}$
Hence the effect of force depends upon the area upon which it acts. Smaller area would have greater effect for equal amount of applied force.