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.
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.
State two ways by which the emf in an A.C. generator can be increased.
Two ways by which the emf in an AC generator can be increased:
i) The speed of the rotation of the coil is increased.
ii) More powerful magnet is used to increase the strength of the magnetic field.
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?