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Which of the following is NOT true regarding the properties of air?
Air is a matter. It has mass.
The burning of fire needs
The burning of fire needs oxygen.
Asma took two balloons. She blew air with mouth in one balloon and she filled another balloon with the vapours of boiling water. She released the two balloons and observed that the balloon with the hot vapours rose higher than the other balloon. What did she learn from this experiment?
Hot air has less weight.
When Suresh blew air into a balloon it expanded. This shows that
Air occupies space.
Which of the following does NOT disturb the balance of gases in the air?
Trees and plants maintain the balance of gases in the air.
When we blow air into a balloon it expands. What is the reason?
Air exerts pressure on the walls of the balloon and it expands.
Which of the following changes weather?
The sun changes the weather conditions.
Answer questions 10 based on the following figure.
Arrow 1 represents
Arrow 1 represents land breeze.
Germs present in tap water can be killed by
Germs present in tap water can be killed by boiling.
The figure below shows an activity which was carried out in a laboratory.
Which of the following phenomena was exhibited by 'X?
In the given figure 'X' represents the condensation of water vapour.