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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. Can we solve this using force method?
    1 months ago by

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  2.  
    3. sir in this why we add pressure from both direction directly ,as in previous case when the container is open then we make pressure at A by different ways in adding diferent directions with P(atm) individually ?
    1 years ago by Ashwani Pandey

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  3.  
    4. sir here will we not add the mass of stone in total reading ?
    1 years ago by Ashwani Pandey

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  4.  
    5. ice melt in liquid but why level of water unchanged
    3 years ago by Kowsika

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  5.  
    6. sir u said that fluids have definite volume but gases which are considered as fluids have indefinite volume plz clarify this soon
    3 years ago by Rahul Kumar

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  6.  
    7. sir in advanced illustrations of fluid dynamics and statics, Q.4 , how did you take pg=1?
    4 years ago by Avni Chauhan

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  7.  
    8. sir a mug floats in water but why a mug filled with water just sinks in water.
    5 years ago by editor jst

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  8.  
    9. sir you have asked change is the height of mercury from initial level that will be h only? and then the answer will be 3cm.
    5 years ago by undefined

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  9.  
    10. sir i want to ask that why you have taken the force Fb in downward direction
    5 years ago by HRITIK Goel

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  10.  
    11. sir are we talking about gauge pressure because atm pressure will cancel out across the wall?
    5 years ago by Shweta Banerjee

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  11.  
    12. at 7.28 s in this vedio Sir how to find wheather the weight of fluid is morethan Nv are not?
    5 years ago by undefined

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  12.  
    13. sir, how Pg=Px ?
    5 years ago by Naman Parihar
    Ans 1 ->
    by pascal law same pressure is there at particular amount of level filled whether it is atm presure or pg it remains same
    5 years ago by Om Jethwani

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  13.  
    14. Sir, won't the weighing scale measure the apparent weight?
    5 years ago by darshil vipul shah

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  14.  
    15. Why did we not take the weight of object into consideration??
    6 years ago by anuradha surapaneni

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  15.  
    16. A block of ice with an area A and a height h floats in water of density P0 What work should be performed to submerge the ice block completely into water if density of ice is P1
    6 years ago by SivaArunagirinathan.S

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  16.  
    17. From where can i get the answers of discussion questions of physics galaxy book
    6 years ago by Abc Xyz

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  17.  
    18. Sir,Why did we not take the weight of object in consideration,because it has not been given that the object is floating?
    6 years ago by Bhavya Sangwan

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  18.  
    19. Sir what if the point that you consider lies below enough so that horizontal through that point meets free surface only when extended.
    6 years ago by Vishal Mishra

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  19.  
    20. to find the net pressure at a point in an accelerated frame why cant we add the pressure due to individual forces(gravity and pseudo). why we are bothering about the net effect of (g) since pressure is a scalar..?? (reference physics galaxy)
    7 years ago by Bharath.P.A

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  20.  
    21. Sir can't we equate the two equations : (l^3d + 200)g - mg = l^2(l-2)dg - mg where : d is the density of water. m is the mass of cube . because LHS and RHS are both equal to 0 .
    7 years ago by Hari Om Sharma

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  21.  
    22. sir what if we apply an external pressure than will pc be equal to pd according to pascal law
    7 years ago by hulk iron
    Ans 1 ->
    sorry not external pressure but external force
    7 years ago by hulk iron

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  22.  
    23. WHAT IF THE SAME SYSTEM IS ACCELERATED UPWARDS?
    7 years ago by sahil sachdeva
    Ans 1 ->
    if accelerated upwards then we must add mg ma to it and find out the tension...
    6 years ago by Neelesh

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  23.  
    24. why we take force on liquid as reading of machine?
    7 years ago by Suryansh Bhandari

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  24.  
    25. If we place a heavy block in a fluid then will there will be any pressure due to the weight of the block below it?
    7 years ago by Suryansh Bhandari
    Ans 1 ->
    Yes any external force here that of the reaction to the block by fluid exerts a pressure on fluid.
    6 years ago by Vishal Mishra
    Ans 2 ->
    You can think of atmosphere also as a kind of block in the sense that it exerts a force on the fluid which in turn creates fluid pressure.
    6 years ago by Vishal Mishra
    Ans 3 ->
    so sir if we were to slice the block and see then the upper part of the block will experience a reaction force due to the solid below it which in turn experiences a free due the fluid particle in contact below it?
    6 years ago by ABHISHEK SHANKAR
    Ans 4 ->
    edit: its not free its force typo mistake
    6 years ago by ABHISHEK SHANKAR

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  25.  
    26. SIR SHOULD WE BUY BM SHARMA FOR PRACTICE OR HCV IS ENOUGH
    7 years ago by tau rathore
    Ans 1 ->
    Buy Physics Galaxy book
    6 years ago by Prince Gupta
    Ans 2 ->
    BUY ASHISH ARORA SIR BOOKS
    6 years ago by SD.Thouseef Ahmed
    Ans 3 ->
    Buy Ashish arora books
    6 years ago by Parveen K

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  26.  
    27. sir what will happen if the tube is closed
    7 years ago by Harshul Singh
    Ans 1 ->
    If the tube is closed and there is no air trapped above the fluid then there will be no pressure due to atmosphere but gauge pressure will act.
    6 years ago by Vishal Mishra

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  27.  
    28. SIR AT 7:00 IF ANY ONE OF THE TUBE IS CLOSED WITH VESSEL THEN WILL THE PRESSURES CHANGE?
    7 years ago by KAIKALA RAVI KUMAR
    Ans 1 ->
    No... as once the upper part of tube is filled with atmospheric air at atm pressure there will not be any change in pressure anywhere...
    7 years ago by Physics Galaxy

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  28.  
    29. Sir...why you are not considering the atmospheric pressure...is it because the atmospheric pressure is acting both inside and outside the vessel due to which it gets balanced out?Sir please help...I'm not getting it...
    7 years ago by shreya sood
    Ans 1 ->
    Yes you are right, it is acting on both sides...
    7 years ago by Physics Galaxy

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  29.  
    30. sir if we take it in gravity free space.. then how will the profile of liquid be? tan(a/G) will tend to pi/2..how is that possible?
    8 years ago by Vaishnavi Kulkarni
    Ans 1 ->
    that is possible as you have considered gravity free space. The physical phenomenon that you have no common experience in day to fay life hence seems strange.
    6 years ago by Vishal Mishra

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  30.  
    31. HOW BUOYANT FORCE=vpg.THAT IS HOW THE TOTAL WEIGHT SUBMERGED= VOLUME OF LIQUID DISPLACED
    8 years ago by KAIKALA RAVI KUMAR
    Ans 1 ->
    it is according to Archimedes principle...
    7 years ago by shreya sood

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  31.  
    32. WHAT IS POTENTIOMETER
    8 years ago by KAIKALA RAVI KUMAR
    Ans 1 ->
    i think its a device to measure potential..
    6 years ago by Neelesh

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  32.  
    33. sir if we take a cone in place of cylinder there will be a sharp edge then how to do?
    8 years ago by Niranjan Reddy
    Ans 1 ->
    so lets us consider the same case as above in the cylinder with same parameters l H1 and H2 so as area is not constant from l H1 and H2 they will most probably give a relation of rate of chance of pressure with respect to area..... so you will have to integrate it ? dF=? P.ds
    6 years ago by ABHISHEK SHANKAR
    Ans 2 ->
    EDIT: its not chance its change typo error
    6 years ago by ABHISHEK SHANKAR

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  33.  
    34. sir if we take a cone in place of cylinder there will be a sharp edge then how to do??
    8 years ago by Niranjan Reddy

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  34.  
    35. Sir buoyant force is Vpg so why didnt you write g term while calculating?
    8 years ago by Charan Sai
    Ans 1 ->
    The g term will get cancelled out so he has written the equation directly.
    8 years ago by Shefali Patra

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  35.  
    36. sir in this if any object is given other than cylinder we ca use the same method or any other method
    8 years ago by surya

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  36.  
    37. While calculating the Buoyant force on the two alloys why didn't you multiplied the expression by g(acceleration due to gravity) as the actual expression is Vxpxg.
    8 years ago by Harsh Sharma
    Ans 1 ->
    I do have the same doubt.....
    8 years ago by Charan Sai
    Ans 2 ->
    The g term will get cancelled out so he has written the equation directly.
    8 years ago by Shefali Patra

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  37.  
    38. a cubical block is floating in a liquid with half of its volume immersed in the liquid. when the whole system accelerates upwards with the acceleration of g/3 the fraction of volume immersed in the liquid will be.........? sir plz explain it....i got 2/3 answer bt it was wrong...
    8 years ago by Khushboo Jain
    Ans 1 ->
    Volume submerged is independent of acc if system Ans. should be half.
    8 years ago by Rishank Pandey
    Ans 2 ->
    22/3 will be the correct answer.you can watch middle school physics video of the chapter fluids.it has the same solved example
    7 years ago by Anurag Dalmia
    Ans 3 ->
    its *2/3
    7 years ago by Anurag Dalmia

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  38.  
    39. is this chapter important for jee
    8 years ago by Faizan Ali Saiyed
    Ans 1 ->
    Of course it is...and you're bound to get questions at both mains and advanced levels
    8 years ago by Kaustav Ghosh
    Ans 2 ->
    Bade conceptual question puch liya
    8 years ago by bhavyam bhargava
    Ans 3 ->
    Bewkufffffffffffffffffffffffffff
    8 years ago by bhavyam bhargava
    Ans 4 ->
    Shu shu shu
    8 years ago by bhavyam bhargava
    Ans 5 ->
    u shudnt say like this
    7 years ago by tau rathore

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  39.  
    40. sir why didn't you not taken the whole volume of that strip means df=y*rho*g*(vol of strip)..
    8 years ago by Aryan Malguri
    Ans 1 ->
    because f=pressure*area(w*dy)
    8 years ago by Aryan Malguri

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  40.  
    41. why is buoyant force not taken in opposite direction? (mg-vpg)
    9 years ago by amit kawad
    Ans 1 ->
    it is written in accordance with the newtons 3rd law of motion....vpg is applied on the body in the upward direction bt the same force in opposite direction is applied by the body on the fluid....here we are to take the normal reaction of he body which is in direct contact with the body..
    8 years ago by Khushboo Jain
    Ans 2 ->
    sorry which is in direct contact of the weighing machine..
    8 years ago by Khushboo Jain

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  41.  
    42. If a small hole is made at a point P in the vertical barometer tube. What will happen? - My answer is as follows. I am not sure of the correctness. Let's regard level of mercury in the tray as zero. level of mercury in barometer tube is L corresponding to atmospheric pressure. The tube contains mercury below level L and vaccum above L. If point P is above level L, then air in the atmosphere will enter the tube and level of mercury inside the tube will drop from L to zero. If point P is below level L, then air in the atmosphere will enter the tube. Air in the form of bubbles will move from P upwards to occupy vaccum at the top of tube. Air will keep entering into the tube until the level of mercury falls from L to zero and the entire tube is filled with air at atmospheric pressure.
    9 years ago by Abhijit

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  42.  
    43. what if it would be a spherical body in the same situation,then how to find forces by each liquid individually?
    9 years ago by Kishan Patel
    Ans 1 ->
    method - 1 : you can find the weight of liquid displaced by sphere in each liquid... that is the total force by each liquid on sphere... method - 2 : you can consider an elemental strip on the sphere in polar coordinates and integrate the force on such strips for the hemispheres separately for both upper and lower one...
    9 years ago by Physics Galaxy
    Ans 2 ->
    sir in this if any object is given other than cylinder we ca use the same method or any other method
    8 years ago by surya

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  43.  
    44. sir the Q is .....if an iron piece is freezed in the ice and that ice block is put in water ..........will the level of water go up or down ...........as compared to other case in which iron piece sinks to the bottom n ice is still floating .....?
    9 years ago by Kamal
    Ans 1 ->
    Whenever a floating body sinks in a liquid ....level always goes down as earlier it was displacing volume of liquid which is equal to its weight and if it sinks the weight of liquid displaced is less...
    9 years ago by Physics Galaxy

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  44.  
    45. why shouldn't it be (l-h)^2*l
    9 years ago by yash
    Ans 1 ->
    (l-h) is the depth of block submerged in water not the base edge length...
    9 years ago by Physics Galaxy

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  45.  
    46. Q.An open rectangular tank 1.5 m wide and 2m long is half filled with water . It is accelerated horizontally at 3.27 m/s sq. in the directon of its legth. determine the depth of water at each end of tank.
    9 years ago by rajat puri
    Ans 1 ->
    You can use inclination angle theta = tan^(-1) (a/g) and using trig ratios easily can find the depth...
    9 years ago by Physics Galaxy

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  46.  
    47. A vessel contains a liquid with the density variable and pressure at depth is given by P=d0/9(1+y/a)gy in which a cube of side a is immeresed such that its top surface is in touch with the free surface of the liquid is released. A) The maximum depth to which cube will move,before coming to rest B) The maximum velocity attained by cube during motion is B) What is maximum velocity attained the block before coming to rest
    9 years ago by Suresh kumar

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  47.  
    48. A vessel contains a liquid with the density variable and pressure at depth is given by P=d0/9(1+y/a)gy in which a cube of side a is immeresed such that its top surface is in touch with the free surface of the liquid is released. A) The maximum depth to which cube will move,before coming to rest B) The maximum velocity attained by cube during motion is B) What is maximum velocity attained the block before coming to rest
    9 years ago by Suresh kumar

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  48.  
    49. sir i did lots of previous years questions n when i gave test i scored very less marks m very tensed now
    10 years ago by aishwarya

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  49.  
    50. p.s. can you tell me how did you write the volume.I didn't understand it.
    10 years ago by himanshu chhabra
    Ans 1 ->
    volume is mass divided by density
    10 years ago by Dhanush K
    Ans 2 ->
    because density=mass/volume.... and density of total substance=cavity+copper piece
    9 years ago by yash

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  50.  
    51. after removal of block , you cancelled out l^3p but i think that the densities were different.One was of wood and the other of water.Please reply.
    10 years ago by himanshu chhabra
    Ans 1 ->
    A vessel contains a liquid with the density variable and pressure at depth is given by P=d0/9(1+y/a)gy in which a cube of side a is immeresed such that its top surface is in touch with the free surface of the liquid is released. A) The maximum depth to which cube will move,before coming to rest B) The maximum velocity attained by cube during motion is B) What is maximum velocity attained the block before coming to rest
    9 years ago by Suresh kumar
    Ans 2 ->
    after removal of water how is the RHS taken into consideration i.e l-h*lpower2rhog?
    8 years ago by samarth sairam

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