• Hydraulic machines - class-X
Back
0

Hydraulic machines - class-X

Description: hydraulic machines
Number of Questions: 20
Created by:
Tags: properties of matter chemistry pressure in fluids and atmospheric pressure general principles and processes of isolation of elements physics principles of metallurgy periodic classification of elements floating bodies fluid pressure general principles of metallurgy mechanical properties of fluids fluids properties of bulk matter metallurgy
Start the Quiz
Attempted 0/19 Correct 0 Score 0
‹
›

The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as:

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

  1. metallurgy

  2. leaching

  3. gravity separation

  4. forth floatation process

Show answer
Correct Option: C
Explanation:
  • Hydraulic washing is based on the difference between specific gravities of the ore and the gangue particles. 
  • It is, therefore, a type of gravity separation. In one such process, an upward stream of running water is used to wash the powdered ore. 
  • The lighter gangue particles are washed away and the heavier ore particles are left behind.

Release valve is seen in :

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:

In the construction of hydraulic press,release valve and press foot valves are there.hydraulic press consist of a pump tube connected with a press tube. The lower end of the pump tube is connected with a smaller tube which is further connected with an underground water tank. At the junction of the pump tube and the smaller tube is fitted a "pump foot valve" which opens in the upward direction only.

Which of the following consists of a master cylinder filled with a thick oil :

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: A
Explanation:

A hydraulic brake essentially consist of a master cylinder which is filled with a thick oil,commonly called brake oil.

Pascal's law is used for the working of:

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: D
Explanation:

Pascal's law is used on all the three.according to pascal's law, whenever any pressure is applied to any party of the boundary of a confined fluid,it is transmitted equally in all directions irrespective of the area on which it acts,and always acts at right angles to the surface of containing vessel.

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,

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

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


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

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

Sand and sawdust can be separated by _________.

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

  1. gravity separation

  2. calcination

  3. magnetic separation

  4. none of these

Show answer
Correct Option: A
Explanation:

Sand and saw dust can be separated by gravity separation method. The process can be used for separating insoluble substances which are heavier than liquid by allowing them to settle down on their own due to gravity.

The method of concentration of the ore that makes use of difference in density between ore and impurities is called __________.

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

  1. levigation

  2. leaching

  3. magnetic separation

  4. liquation

Show answer
Correct Option: A
Explanation:

Levigation is based on the difference in densities of the metallic ore and gangue particles. Powdered ore is treated with a stream of running water when the lighter gangue particles are washed away and heavier ore particles are left behind.

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

Write the correct alternatives :
In the Wilfley table method, the particles of gangue are separated by...................separation method.

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

  1. Magnetic

  2. Froth floatation

  3. Hydraulic

  4. Gravitational

Show answer
Correct Option: C
Explanation:

Hydraulic Washing :

In this method by flowing the powdered ore in a current of water, lighter rocky impurities can be washed away, for this, either wilfley table or Hydraulic classifier is used.

$\therefore$ option $"C"$ is correct.

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

Hydraulic washing is based on the differences in ___________ of the ore and gangue particles.

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

  1. specific gravities

  2. mass

  3. type of material

  4. none of these

Show answer
Correct Option: A
Explanation:

Hydraulic washing is a type of gravity separation, which is based on gravity differences between the ore and the gangue particles. In this process, the lighter gangue particles are washed away by a stream of water, leaving behind the heavier ore.

A large cylindrical tank has a hole of area $A$ at its bottom and water is poured into the tank through a tube of cross-section area $A$ ejecting water at the speed $v$. Which of the following is true?

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

  1. Water level in tank keeps on rising

  2. No water can be stored in the tank

  3. Water level will rise to height $v^{2}/2g$ and then stop

  4. The water level will be oscillating

Show answer
Correct Option: C
Explanation:

In the beginning ,the water escaping the vessel at the rate $\sqrt{2gh}$ and filling it at the rate of $vA$


So the rate of change in the water level of the vessel at any instant is 
($v-\sqrt{2gh})A$ 
where  'h' is the instantaneous height 

Since h is quite small in the beginning, the water is escaping the vessel at a slow rate but filling at a much larger rate as such    ($v-\sqrt{2gh})A$  ,is positive  (increase in water level)

soon after the filling of water  occurs, the height increases and the rate of escape become larger 
But when the rate =rate of filling ,then an equilibrium state is reached and there is no net change  in the height of the water 

the equilibrium is reached when ($v-\sqrt{2gh})A$ =0  $\rightarrow$  $h=\dfrac{v^2}{2g}$

- Hide questions
ADVERTISEMENT

Find more quizzes from top tags

general knowledge
3615 Quizzes
119858 Questions
 technology
307 Quizzes
36705 Questions
 sports
963 Quizzes
19148 Questions
 history
1187 Quizzes
13475 Questions
 physics
598 Quizzes
13441 Questions
 biology
1160 Quizzes
12174 Questions
 science & technology
551 Quizzes
11015 Questions
 chemistry
490 Quizzes
9892 Questions
 maths
518 Quizzes
9324 Questions
 softskills
0 Quizzes
7131 Questions