Heat — PHYSICS STD 7 — Question

When a bulb lights up on passing current, the change of energy is

A car moving on a straight road is an example of

Select the correct alternative
The density of alcohol is 0.8 g cm-3. In S.I. unit, it will be :

The mode of transfer of heat that requires no material medium is

An observer puts ear on a railway line 500 m from a friend with a hammer. When his friend hits the railway line with the hammer, the observer hears two sounds. The sound is first heard through :

We can hear sound of frequency

The total space occupied by an object is called its

The image formed by a plane mirror is :

A freely suspended magnet always points in the