MEDIUM
9th CBSE
IMPORTANT
Earn 100

An empty plastic bottle floats, while a plastic bottle filled with sand sinks in water. Why?

Important Questions on Gravitation

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 9
How will the magnitude of buoyancy exerted by a liquid change if its volume is doubled?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 10
Why do buildings have wide foundations?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 11
A sheet of a paper falls slower than a coin under gravity through air. Why?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 12
State the SI unit of density. Relate it with its cgs unit.
MEDIUM
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 13
On what principle are submarines based?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 14
In which direction do fluids exert pressure?
EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 15

The head of a pin is flat and thick whereas its tip is fine and thin. Explain why? Write a formula that support your answer.

OR

When you press the head of a pin, it pierces into the board and not your thumb. Why?

EASY
9th CBSE
IMPORTANT
Together with Science Class 9>Chapter 10 - Gravitation>ASSESS YOURSELF>Q 16
Why are railway tracks laid on large-sized concrete sleepers? Explain.