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?

Mechanical pumps cannot

A hose of cross- sectional area 0.5m² is used to discharge water from a water tanker at a velocity of 60m/s in 20s  into a container. If the container is filled completely, the volume of the container is

Water and kerosene are drawn respectively into two limbs of a Hare's apparatus. Density of water is 1.0g/cm³ and the density of kerosene is 0.80g/cm³. If the height of the water column is 20.0cm, calculate the height of the kerosene column.

Which of the following is obeyed if a force on a sphere moving through a viscous fluid is proportional to its speed, radius and viscosity?

A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because

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

A steel needle floating on the surface of water sinks when kerosene is added to the water because

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.

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

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

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?

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

Which of the following factors influence the rate of flow of water through a pipe to houses?
I. the material of the pipe
II. the diameter of the pipe
III. the viscosity of the water

The motion of a falling sphere through a viscous liquid is represented by the graph below. The terminal velocity is determined as the 

Which of the following statements is correct?
The reading of pressure on a mercury barometer is dependent on

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

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

Mercury is suitable as a barometric fluid because it

I. Density of the liquid
II. Depth below the surface of the liquid
III. Surface area of the liquid

In which of the statements above will pressure be dependent?

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

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?

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

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.

A balloon filled with hydrogen rises when released into the air because