Mechanical pumps cannot

In the diagram below, if the atmospheric pressure is 760mm, the pressure in the chamber G is

1000 identical drops of oil of density 500kg/m³ have a total mass of 0.0005kg. One of the drops form a thin film of area 0.5m² on water. The thickness of the film is.

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)

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

Which of the following cannot be correctly explained using the concept of surface tension?

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

A uniform cylindrical block of wood floats in water with one-third of its length above the water level. In a liquid of R.D 0.8, what fraction of its height would be above the liquid level?

A liquid of mass 1000kg fills a rectangular tank of length 2m. If the tank is 4m high, what is the pressure at the middle of the tank?

The hatch door of a submarine has an area of 0.5m². The specific gravity of sea water is 1.03, assume that g = 10m/s² and neglect the atmospheric pressure, the force exerted by the sea water on the hatch door at the depth of 200m is

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

An object of volume 1m³ and mass 2kg is totally immersed in a fluid of density 1kg/m³. Calculate its apparent weight

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

When someone uses her thumb to push a drawing pin into a block of wood, the pressure on the wood is greater than the pressure on the thumb. 
Answer True (T) or False (F)

Which of these statements are true of pressure in liquid?
I. pressure acts equally in all directions
II. pressure decreases with depth
III. pressure at the same level of a liquid is the same
IV. pressure is dependent on the cross-section area of the barometer tube

Normal atmospheric pressure at sea-level is 100,000N/m². The acceleration due to gravity is approximately 10m/s². If the atmosphere has uniform density 1kg/m³, the height is

In the diagram below, V is the viscosity, U is upthrust. Which of the following equations holds when the falling body P has attained a terminal velocity?

An object weighs 22kg in water and 30kg in air. What is the upthrust exerted by the liquid on the object? (g = 10m/s²)

When a ship sails from salt water into fresh water, the fraxction of its volume above the water surface will?

Which of the following devices are used to measure pressure?
I. Aneroid barometer
II. Hydrometer
III. Hygrometer
IV. Manometer

40cm³ of liquid P is mixed with 60cm³ of another liquid Q. If the density of P and Q are 1.00kg/m³ and 1.6kg/m³ respectively, what is the density of the mixture?

The density of a solid is defined as the

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

What is the height of the liquid column in a barometer tube that would support an atmospheric pressure of 102,000N/m² if the density of the liquid is 2,500kg/m³.
(g =  10m/s²).