Diversity In Living Organisms — Science STD 9 — Question

Name two exotic varieties of cow.

What name is given to this number?

The atomic number of an element X is 16.
Write down the electronic configuration of X.

Name the element used as a standard for atomic mass scale.

The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density– air, exhaust from chimneys, honey, water, chalk, cotton and iron.

Give one example the following.
Solution of a gas in liquid.

Name two sound absorbing materials (or objects) which can make our big room less echoey.