Physics class ix notes 9th class board pattern model paper
Physics Chapter No-04 Important questions, if you attempt these question you will get InshaAllah 100% marks.
Objective
Part
Choose the right option.
10×1=10
A
|
B
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C
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D
|
||
1
|
The builders used to keep
vertically the wall straight
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Spanner
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Screw
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Plumb line
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Meter rod
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2
|
According to first condition for
equilibrium:
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Ʃfx=0
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Ʃfy=0
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ƩfƮ=0
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Both (a) and (b)
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3
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In neutral equilibrium, centre of
gravity then original position is:
|
Lowered
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Raised
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Remains the same
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None of these
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4
|
A meter rod balance on a wedge is
an example of:
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Stable equilibrium
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Unstable equilibrium
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Neutral equilibrium
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None of these
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5
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The SI unit of Torque is:
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N
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Nm
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Ns
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Ns-1
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6
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The moment of force depend on:
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Force
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Moment arm
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Centre of gravity
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Both (a) and (b)
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7
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The centre of gravity of a
triangular sheet is the point of intersection of its:
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Medians
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Diagonals
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Parallel sides
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Both (b) and (c)
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8
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In a right angled triangle,
length of base is 3 cm and its perpendicular is 4cm. tan will be:
|
1
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1.33
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1.44
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1.55
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9
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A force of 10 N is making an
angle of 300 with the horizontal. Its horizontal component will
be:
|
4N
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5N
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7N
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8.7N
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10
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If the rotation is produced in
anticlockwise direction, then the torque is taken as:
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Positive
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Perpendicular
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Parallel
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Negative
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Subjective
Answer
the following short questions. 10×2=20
1. What
do you mean by resolution of forces and perpendicular components?
2. Define
clockwise and anticlockwise moments with examples.
3. Think
of a body which is at rest but not in equilibrium.
4. Differentiate
between torque and couple.
5. A
force of 100 N is applied perpendicularly on a spanner at a distance of 10cm
from a nut. Find the torque produced by the force?
6. Define
torque; on what factors does the torque depend?
7. Define
centre of mass and centre of gravity.
8. What
is meant by neutral equilibrium? Give at least one example.
9. A
block of weight 10N is hanging through a cord. Find the tension in the cord?
10. Define
equilibrium and stable equilibrium.
Long Questions 5×1=5
1. (a)
Write a note on states of equilibrium with examples.
3
(b) Find the
perpendicular components of a force of 50N making an angle of 300 with
x-axis? 2
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