Asma took two balloons. She has blown one balloon with her mouth. She filled another balloon with the vapours coming out of boiling water. When the balloons are released she observed that the balloon with the hot vapours raised to more height than the other balloon. What can she learn from this experiment?

Ramu took a glass of cold water from the refrigerator and placed it on a table. After a few minutes he observed water drops on the outer surface of the glass. What happened?

Germs present in tap water can be killed by

Many trees on the sides of a particular highway were bent on a side with twisted trunks and branches. This could be result of

Which one of the following does NOT disturb the balance of gases in the air?

The weather forecast in a week has been summarised as below. Answer the question based on the chart:

A school wants to arrange a picnic for its students. What is the best day for that?

Study the table given below and answer the question

In which of these solutions can we see the undissolved substances?

The occurrence of seasons on the earth is primarily because of

Which one of the following statements are correct?

Which one of the following activity requires oxygen?