Laws of Motion — PHYSICS STD 9 — Question

What is the SI unit of charge?

Define the electrical resistance of a metal. Write its SI unit.

How will you plot the magnetic field lines by using a small compass needle?

What do you mean by relative density?

What can you say about the nature of motion of a body if its displacement-time graph is A straight line inclined to the time axis with an acute angle?

A body falls freely downward from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine 'g' from the graph?

Why does a substance expand on heating?

n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, then write an expression for the current in the conductor.

Do all liquids exert pressure?