Arun Syamal Solutions for Chapter: Matter in Our Surroundings, Exercise 4: Higher Order Thinking Skills (HOTS) Questions

Arrange the following in the order of increasing density: water, honey, air, exhaust from chimneys, cotton, chalk, iron rod.

Why is ice at $273 \mathrm{K}$ more effective in cooling than water at the same temperature?

When we observe the melting of ice, the melting point of ice is a constant temperature at which

State the amount of heat lost by the human body during evaporative respiration. From which physical property did you get this value? 

Arrange the following in the increasing order of moisture absorbing capacity of clothes: nylon, terry-cot, polyester, cotton.

Why do people sprinkle water on the open ground or roof after a hot sunny day?

Amit spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled up with pungent irritating odour. The students immediately opened the doors and windows and switched on the exhaust fans. After some time, the students got relief. Explain what did actually happen and name the phenomenon which is responsible for this.

Ordinary water boils at ${100}^0\mathrm{C}$. Can it be made to boil at $95°\mathrm{C}$ or $105°\mathrm{C}$?