Unit - 4.2 Reflection Of Light On Plane Surfaces — PHYSICS STD 7 — Question

Given below statement is incorrect. Write the correct statement :
To avoid derailment of train, the rails are fixed tightly, leaving no space for expansion or contraction.

Draw a neat labelled diagram of a laboratory thermometer.

Given below stament is incorrect. Write the correct statement :
A pipette can measure any small volume of a liquid.

Name the mode of transfer of heat in the following :
(a) solid,
(b) liquid,
(c) gas
(d) vacuum

Name the type of motion being performed by Earth around the sun.

Name the type of motion being performed by Hands of a clock.

Explain the following :Why are the cooking pots provided with plastic or wooden handles?

During a thunderstorm, the sound of a thunder is heard after the lightning is seen. Why ?

How is the position of image formed by a plane mirror related to the position of the object ?

Given below statement is incorrect. Write the correct statement :
The metallic wires contract during summer and can break.