Heat — PHYSICS STD 9 — Question

What is the unit of coefficient of linear expansion?

How will you test whether a given rod is made of iron or copper?

How does the liquid pressure on a diver change if: the diver moves to the greater depth

What are the SI units of velocity?

A current of 4.5 A flows through a conductor for 2.5 s. What amount of charge passes through the conductor?

Name the instrument which can accurately measure the following
The diameter of a pencil.

Distinguish between uniform velocity and variable velocity.

A ball is moving on a perfectly smooth horizontal surface. If no force is applied on it, then will its speed decrease, increase or remain unchanged?

Name an agent which decomposes animal dung into biogas.

When we look into a plane mirror, is the image of our face real or virtual?