Tag: physics

Questions Related to physics

Which of the following is used for punching holes in metals:

physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. Hydraulic brakes

  2. Hydraulic jack

  3. Hydraulic press

  4. All

Show answer
Correct Option: C
Explanation:

Hydraulic press are used for compressing the straw and cotton bales.it is also used for punching holes in metals.

The material used for brake drum is

physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. Alluminum alloy

  2. Cast steel

  3. Pressed steel

  4. Cast Iron

Show answer
Correct Option: D
Explanation:

The material used for brake drum is Cast Iron.


Hence, option D is correct.

The hydraulic press is used in the extraction of oil from oil-seeds.

physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Hydraulic press is used  for various purposes including extraction of oil from oil seeds . 

so  given statement is true
hence option (A) is correct

Hydraulic press works on the principle of Pascal's principle

physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Pascal law states that any increment in pressure applied to the enclosed fluid is transmitted undiminished at each pt of the fluid and the walls of the container.

and  hydraulic press works on the principle of pascal law 
so option (A) is correct.

Lifting automobiles in service stations is based on the principle of ________.

physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. Apparent pressure 

  2. Hydraulic pressure

  3. Atmospheric pressure

  4. none of the above

Show answer
Correct Option: B
Explanation:

Lifting automobiles in service stations is based on the principle of Hydraulic pressure .

hydraulic press is based on the pascal law .
so option (B) is correct

The radii of the press plunger and the pump plunger are in the ratio 30 : 4. If an effort of 32 kgf acts on the pump plunger. Find the maximum effort the press plunger can overcome.

physics pressure in fluids and atmospheric pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. 1600 kgf

  2. 1700 kgf

  3. 1800 kgf

  4. 1900 kgf

Show answer
Correct Option: C
Explanation:

$\dfrac {\text {Radius of the press plunger}}{\text {Radius of pump plunger}}=\dfrac {R}{r}$


$=\dfrac {30}{4}$

According to the principal of hydraulic machine,

$\dfrac {L}{E}=\dfrac {\pi R^2}{\pi r^2}$

$\Rightarrow \dfrac {L}{32 kgf}=(\dfrac {30}{4})^2$


$\Rightarrow \dfrac {L}{32}=\dfrac {900}{16}$

$\Rightarrow L=\dfrac {900\times 32}{16}=1800 kgf$

Water is poured from a height of 10 m into an empty barrel at the rate of 1 litre per second. If the weight of the barrel is 10 kg, the weight indicated at time t = 60 s will be 

physics pressure in fluids and atmospheric pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. $71.4 \mathrm { kg }$

  2. $68.6 \mathrm { kg }$

  3. $70.0 \mathrm { kg }$

  4. $84.0 \mathrm { kg }$

Show answer
Correct Option: B
Explanation:

Time taken to reach $10m$ below $=\sqrt {\dfrac{{2 \times 10}}{{10}}}  = \sqrt 2 \,\sec $

$\therefore $ only $\left( {60 - \sqrt 2 } \right)\sec $ is effective for pouring of water
$\therefore $ total weight $=10lkg+\left( {60 - \sqrt 2 } \right)l \times \dfrac{{1\,kg}}{l}$
$=58.6kg+10kg$
$=68.6kg$
Hence,
option $(B)$ is correct answer.

The residual pressure of a vessel at ${27}^{o}C$ is $1\times{10}^{-11}N/{m}^{2}$. The number of molecules per cc in this vessel is nearly

physics pressure in fluids and atmospheric pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. $2400$

  2. $2.4\times{!0}^{8}$

  3. ${10}^{-11}\times 6\times{10}^{23}$

  4. $2.68\times{10}^{-19}\times {10}^{-11}$

Show answer
Correct Option: C

Two identical holes of each of cross sectional area $A$ are opened on the opposite sides of a wide vertical vessel filled with water.The difference in vertical height of the two holes is $h$. The resultant force of reaction of water flowing out of vessel is-

physics pressure in fluids and atmospheric pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. $h\rho gA$

  2. $\cfrac{1}{2}h\rho g A$

  3. $2h\rho gA$

  4. $\cfrac{1}{4}h\rho g A$

Show answer
Correct Option: C

Hydraulic lifts are used to lift the heavy loads primarily because :

physics pressure in fluids and atmospheric pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

  1. they look good

  2. they amplify the force applied by a large extent

  3. they are sturdy

  4. they have better tensile strength

Show answer
Correct Option: B
Explanation:

Hydraulic lifts works on the pascals law principle 

therfore it amplify the force applied by a large extent  
hence option (B) is correct