Liquids generally have lower density as compared to solids but you must have observed that ice floatis on water. Find out/why.

Liquids generally have lower density as compared to solids but you must have observed that ice floats on water. Find out/why.

Give reasons : Gases have lower density compared to that of solids or liquids.

Explain why does iso-pentane have a lower boiling point as compared to that of n-pentane?

In order to find the density of a solid we have to find its :

Vapour density of a gas having formula [CO]_x is 70. Find out X

Consider the following four statements (i)-(iv) about certain desert animals such as kangaroo rat. i) They have dark colour and high rate of reproduction and excrete solid urine ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs iii) They feed on dry seeds and do not required drinking water iv)They excrete very concentrated urine and do not use water to regulate body temperature. Out of these four, which two are correct :

A wire having a linear density 0.1 kg//m is kept under a tension of 490N. It is observed that it resonates at a frequency of 400 Hz. The next higher frequency is 450 Hz. Find the length of the wire.