A cube of glass of 5cm side and mass 306g has a cavity inside it. If the density of glass is 2.55g/cm³, what is the volume of the cavity?
A steel needle floating on the surface of water sinks when kerosene is added to the water because
If a fluid flows out of a narrow tube at a depth h below the surface, its velocity is
A balloon of volume 100m³ and mass 2kg is filled with helium of density 0.18kg/m³ at ground level. The surrounding air has a density of 1.28kg/m³. Calculate the maximum mass which the balloon can lift off the ground.
The mass of a specific gravity bottle is 15.2g when empty. It is 24.8g when filled with petrol and 27.2g when filled with distilled water. Calculate the R.D of petrol.
An object of mass 400g and density 600kg/m³ is suspended with a string so that half of it is immersed in paraffin of density 900kg/m³. The tension in the string is
A ship floating in clear water of density 1000kg/m³ moves to sea water of density 1050kg/m³ where it floats again. The upthrust on the ship then?
What is the theoretical maximum height through which a pump could raise water on a day when the atmospheric pressure is 760mm/Hg.
(density of mercury = 13.6g/cm³)
When a ship sails from salt water into fresh water, the fraxction of its volume above the water surface will?
If a beaker is filled with water, it is observed that the surface of the water is not horizontal at the glass-water surface. This behaviour is due to.
I. Density of the liquid
II. Acceleration due to gravity
III. Type of container of the liquid
IV. The constituents of the liquid
Which of the above conditions will NOT affect the pressure of liquid?
The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
(ꝭm = 13.6g/cm3, ꝭa = 0.00013g/cm3)
A spherical metal ball falling through a viscous liquid is acted upon by the
I. weight of the ball
II. viscous force of the liquid on the ball
III. upthrust of the liquid on the ball
The forces acting on a body which is suspended freely in still air from a support are
Which of the following statements is/are correct about the common hydrometer?
I. it has a long narrow stem
II. the R.D values marked on the stem increases down the stem
III. it has a wide bulb
IV. the bulb is loaded to make the hydrometer float vertically
For accurate measurement of atmospheric pressure, it is preferable to use which of the following instrument.
A thin hydrometer floats stationary in water at a temperature of about 20ºc. If the water is gradually cooled to 0ºc, their hydrometer will.
A balloon whose volume is 300m³ is filled with hydrogen. If the density of air is 1.3kg/m³, find the upthrust on the balloon
A body whose mass is 2kg has a volume of 500cm³ just floats when completely immersed in a liquid. Calculate the density of the liquid
The rise or fall of a liquid in a narrow tube is because of the
A hydrometer is an instrument for measuring the
The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ?
The density of water is 1g/cm³ while that of ice is 0.9g/cm³. Calculate the change in volume when 90g of ice is completely melted.