MEDIUM
9th CBSE
IMPORTANT
Earn 100

Why do we wear cotton clothes in summer?

Important Questions on Matter in Our Surroundings

EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 23

Why do we sprinkle water on the roof or open ground in summer?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 24

Why is ice rubbed on a burnt part of the skin?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 25

Why does our palm feel cold when we put some acetone (or perfume) on it?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 26

Why are we able to sip hot tea (or coffee or milk) faster from a saucer than from a cup?

EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 27
When water is cooled to a temperature X, it gets converted into ice at temperature X by a process called? What is the value of X (in Kelvin) and name the process p?
MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 28
A sample of water under study was found to boil at 102°C, at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 29
Ramesh took two beakers A and B containing hot water and cold water, respectively. In each beaker, he dropped a crystal of copper sulphate. He kept the beakers undisturbed. After some time what did he observe and why?
EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 30
In a comparison of normal air, what is the density for the formation of BEC?