Write the molecular formula of first two members of homologous series having functional group – Cl.

The rest positions of the needles in a milliammeter and voltmeter not in use are as shown in Fig. A. When a student uses these in his experiment, the readings of the needle are in the positions shown in Fig. B.

Find the corrected values of current and voltage in the experiment.

OR

While experimentally verifying Ohm’s law a student observed that the pointer of the voltmeter coincides with 15thdivision when the voltmeter has a least count of 0.05 V. Find the observed reading of voltmeter.

How many molecules of water of crystallisation are there in

i. Plaster of Paris

ii. washing soda crystals?

Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

List two biotic components of a biosphere.