MEDIUM
9th CBSE
IMPORTANT
Earn 100

Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water. 

Important Questions on Model Test Paper 2

MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 17
Define mole. What are the two things that a mole represents?
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 17

What mass of each element is present in 1.5 moles of sodium sulphite(Na2SO3)?

(Atomic masses Na=23.0u, S=32.0u, O=16.0u)
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 18
What do you understand by the terms “balanced forces” and “unbalanced forces”? Explain with examples.
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 18
What type of forces – balanced or unbalanced - act on a rubber ball when we press it between our hands? What effect is produced in the ball?
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 19
Explain why a cricket player moves his hands backward while catching a fast cricket ball.
HARD
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 19
A 150 g ball travelling at 30 m s-1 strikes the palm of a player’s hand and is stopped in 0.06 s. Calculate the force exerted by the ball on the hand.
MEDIUM
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 20
In brief, state what happens when dry apricots are left for some time in pure water and later transferred to the sugar solution. 
EASY
9th CBSE
IMPORTANT
Science for Ninth Class (Part-3) Biology>Chapter 8 - Model Test Paper 2>SECTION-A>Q 20
In brief, state what happens when a red blood cell is kept in a concentrated solution.