A cargo ship is loaded into sea water to maximum capacity. What will happen if this ship is moved to river water? Give a reason for your answer?
A body of mass 100 g is floating in water. What will be it’s apparent weight? Justify your answer.
The apparent weight of a floating body is zero. When an object floats, the weight of the object is equal to the weight of the liquid displaced by its submerged part. Thus the weight of the body is equal to upthrust.
Therefore,
Apparent Weight = True weight – Upthrust = 0The diagram given below shows an object O and its image I. Copy the diagram and draw suitable rays to locate the lens and its focus. Name the type if lens in this case.
i) State Snell’s law.
ii) Calculate the velocity of light in a glass block of refractive index 1.5. ( Velocity of light in air = 3 x 108 m/s.
i) Give one difference between a chemical change and nuclear change.
ii) How is a cathode ray tube used to convert an electrical signal into a visual signal?