Give reasons for the following. (a) Policemen regulating traffic often – InterviewSolution

1.	Give reasons for the following. (a) Policemen regulating traffic often wear masks. (b) When water is heated , bubbles are observed.
Answer» (a) Policemen wear masks in order to protect themselves from smoke and dust particles emitted by vehicles. (b) When water is heated , the air dissolved in it comes out in the form of tiny bubbles.

Discussion

No Comment Found

Related InterviewSolutions

Mention the essential requirements for rusting of iron.
How will you show that air is essential for burning ?
Fuels react with oxygen to form ____________ and __________.
Fill in balanks. The products of combustion of fossil fuels are ___________ and __________.
Select the correct alternative from the given options . Gas X `to` Combustible and not a supporter of combustion Gas `to ` Combustible as well as a supporter of combustion . What could be X and Y ?A. X `to` Oxygen , Y `to ` NitrogenB. X `to` Carbon dioxide , Y `to` OxygenC. X `to` Oxygen , Y `to` Carbon dioxideD. X `to` Carbon dioxide , Y `to` Argon
What is the obervation when air comes in contact with a cool surface ?
(a) Write the chemical name of the substance taken in the test tube. (b) What is the observation ? Give reasons. ( c) The air present in the test tube as shown in the diagram is sucked out . why ?
(a) Identify the mistakes (s) in the diagrams and give justification. What inference can be drawn from above diagrams ?
Can an empty bottle be filled with water , when it is inverted into a basin of water vertically ? If not , what is the correct way of filling the bottle with water ? Justify your answer.
When an empty spray pump is taken and air is blown on a clean mirror , the mirror remains clean. If we gently blow out air form lungus on the same mirror , the mirror misty . Give reason.