Physics class ix notes 9th class board pattern model paper
Physics Chapter No-07 Important questions, if you attempt these question you will get InshaAllah 100% marks.
Objective Part
Choose the right
option. 10×1=10
A
|
B
|
C
|
D
|
||
1
|
The SI unit of pressure is
Pascal, which is equal to:
|
104
Nm-2
|
1 Nm-2
|
102
Nm-2
|
103
Nm-2
|
2
|
The density of a substance can
be found with the help of:
|
Pascal’s law
|
Hooke’s law
|
Principle of
flotation
|
Archimedes
principle
|
3
|
If a balloon is inflation more
than its capacity, it will burst because:
|
Increase in
temperature
|
Increase in
volume
|
Increase in
density
|
Increase in
pressure
|
4
|
The density of water is:
|
1000 kgm-3
|
1000 kgm3
|
800 kgm3
|
800 kgm-3
|
5
|
Molecules are closely packed
in:
|
Plasma
|
Liquids
|
Solids
|
Gases
|
6
|
At sea level, the atmospheric
pressure is equal to:
|
11,300 pa
|
101,300Nm-2
|
Zero
|
101,300 N
|
7
|
The SI unit of stress is:
|
Nm
|
Nm-2
|
Nm2
|
Has no unit
|
8
|
If an object restores its
original size and shape, it is said to be:
|
Hard
|
Soft
|
Elastic
|
Rigid
|
9
|
According to Hooke’s law, the
stress and strain are:
|
Zero
|
One
|
Directly
proportional
|
Inversely
proportional
|
10
|
The SI unit of Young’s modulus is
:
|
Nm
|
Nm-2
|
N
|
Has no unit
|
Subjective
Answer
the following short questions.
10×2=20
1. Define
density and write down the density equations.
2. Why
does a piece of stone sink in the water but a ship with a huge weight floats?
3. What
is Hook’s law? What is meant by elastic limit?
4. How
we can push the liquid up with the help of straw?
5. A
wooden cube of sides 10cm each has been dipped completely in water. Calculate
the upthurst of water acting on it.
6. The mass of 200cm3 of stone is 500g. Find its density.
7. State
the Pascal’s law. What are its applications in our daily life?
8. What
is barometer? Why water is not suitable to be used in barometer?
9. Why
does the atmospheric pressure vary with height?
10. Which
important features tell in kinetic molecular model of matter?
Long Questions 5×1=5
1. (a)
State and explain the principle of flotation, how ships and submarines work on
this principle? 2.5
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