A mercury barometer, with a tube of uniform diameter and length of 850mm above the mercury level in the reservoir, reads 750mm on a day when the atmospheric pressure is 760mmHg. What will be the atmospheric pressure on a day when it reads 730mm.

The terminal velocity of a ball-bearing falling through a viscous fluid is reached when the

The mass of a stone is 15g when completely submerged in water and 10g when completely submerged in a liquid of R.D 2.0. The mass of the stone in air is

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 well 1km deep is filled with a liquid of density 950kg/m³. If the atmospheric pressure is 100000N/m² and g = 10m/s², the pressure at the bottom of the well is

Relative density of zinc, brass, copper, gold and silver are 7.1, 8.5, 8.9, 19.3 & 10.5 respectively. A metal ornament which weighs 0.425kg and can displaced
50 x 10^-6m³ of water is made of

Two divers G & H are at depths 20m & 40m respectively below the water surface in a lake. The pressure on G is P₁  while the pressure on H is P₂ . If the atmospheric pressure is equivalent to 10m of water, the value of P₂ /P₁ is

When a paint brush is removed from clean water, the bristles of the brush are pulled together because of

The accurate measurement of the relative density of substances in powder or granular form can be done using a beam balance and a ?

What is the total pressure in cmHg at a point 15m below the surface of a fresh water reservoir. Atmospheric pressure, 76cmHg, density of mercury is 13.6g/cm³

A solid of weight 0.6N is totally submerged in oil and water respectively. If the upthrust in oil is 0.21N and the R.D of oil is 0.875, find the upthrust in water.

A rectangular tank contains water to the depth of 2m. If the base is 4m x 3m, calculate the force on the base ( density of water = 1000kg/m³, g = 10m/s²)

The density of 400cm³ of oil was 0.9g/cm³ before frying. If the density of the oil was 0.6g/cm³ after frying, assuming no loss of oil due to spilling, its new volume was

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)

Which of the following is most viscous at room temperature?

When the temperature of a liquid is increased, its surface tension.

The pressure exerted by a liquid in a container is dependent on the

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kg/m³ and sealed. What is the maximum pressure this container can exert on a flat surface?

Calculate the pressure on Radeyah's thumb when she exerts a force of 20N and the top of the pin is square, the length of each side being 10mm
0.2N/mm²

A parachute attains a terminal velocity when

Which of the following statements is/are true?
I. detergents poured into water increases its surface tension.
II. oil poured onto water reduces its surface tension.
III. surface tension helps to keep the eggs of water insects aloft.

A metal cube of volume 10³mm³ is lowered into a measuring cylinder containing water. If the internal cross-sectional area of the cylinder is 1.5 x 10²mm², by how much does the water level rise in the cylinder?

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?

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? (density of sea water = 1013kg/m³; one atm = 101,000N/m²;
g = 10m/s²)

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