MEDIUM
9th CBSE
IMPORTANT
Earn 100

Give reason for the following:

Ions are more stable than atoms.

Important Questions on Practice Paper 3

MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 32

Give reason for the following:

Noble gases have low reactivity.

HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 32

Give reason for the following:

An atom is electrically neutral.

HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 33

Identify the kind of motion in the following cases:

(i) A car moving with constant speed turning around a curve.

(ii) An electron orbiting around nucleus.

HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 33
An artificial satellite is moving in a circular orbit of radius 36,000 km. Calculate its speed if it takes 24 hours to revolve around the earth.
HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 33
Why is uniform circular motion called accelerated motion?
HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 33
An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the velocity after 7 s from the start? 
HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 34
State two factors on which the magnitude of buoyant force acting on a body immersed in a fluid depends.
HARD
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 18 - Practice Paper 3>3; PRACTICE PAPER>Q 34
Will buoyant force exerted by a liquid increase if its volume is increased?