Physics class ix notes 9th class board pattern model paper
Physics Chapter No-03 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 weight of
a body of mass of 20 kg on the earth will be:
|
2N
|
10N
|
20N
|
200N
|
2
|
Which one of
the following direct measures the inertia?
|
Energy
|
Momentum
|
Mass
|
Weight
|
3
|
The SI unit of
momentum is:
|
kgms-1
|
Ns
|
kgms-2
|
Both a and b
|
4
|
Fragile
objects are packed in Styrofoam or polythene to increase:
|
Tension
|
Impact time
|
Inertia
|
Momentum
|
5
|
The SI unit of
force is:
|
Joule
|
Newton
|
Watt
|
None of these
|
6
|
One Newton is
equal to:
|
1 kgm-1s-1
|
1 kgm-1s-2
|
1 kgs-2
|
1 kgms-2
|
7
|
Weight is
measured by a:
|
Beam balance
|
Spring balance
|
Both (a) and (b)
|
None of these
|
8
|
The SI unit of
the coefficient of friction is:
|
Newton
|
Joule
|
Watt
|
No unit
|
9
|
Static
friction than kinetic friction is:
|
Less
|
Quartered
|
Greater
|
Half
|
10
|
When horse
pulls a cart, the action is on the:
|
Cart
|
Earth
|
Horse
|
Earth and cart
|
Subjective
Answer
the following short questions. 10×2=20
1.
Differentiate between mass and weight.
2.
Find the acceleration that is produced
by a 20 N force in a mass of 8 kg?
3.
Why is it dangerous to travel on the
roof of a bus?
4.
Action and reaction are always equal and
opposite then how a body does moves?
5. Describe ways to reduce friction.
5. Describe ways to reduce friction.
6.
Define force and also define its unit.
7.
How does the dryer of a washing machine
work on the principle of centripetal force?
8.
What is the law of conservation of
momentum? Give its examples.
9.
A force of 20 N moves a body with an
acceleration of 2ms-2. What is its mass?
10.
State the Newton’s third law of motion
with examples.
Long Questions 5×1=5
1.
(a) State and explain the Newton’s
Second law of motion.
2.5
(b)
How much centripetal force is needed to make a body of mass 0.5 kg to move in a
circle of radius 50cm with a speed 3ms-1? 2.5
Available all
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