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 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.
This is a convex lens.
The ray diagram is as given below:
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?