CHAPTER
1 FORCE
2025
1. A
body is acted upon by two equal and opposite forces, that are NOT along the
same straight line. The body will:
(a) remain stationary
(b) have only rotational motion
(c) have only rectilinear motion
(d) have both rectilinear and
rotational motion
2. Which
among the following is a vector quantity?
(a) work
(b) power
(c) energy
(d) moment of couple
3. In
uniform circular motion the centrifugal force acts _______.
[towards the centre / away from the
centre / along the tangential direction].
4. A
non-uniform kite is hanging freely from the branch of the tree as shown in the
figure.
Fill in the blank.
(i)
____ (P, Q, R or S) is the most probable
position of its centre of gravity.
(ii)
Support your answer to (a) with a reason.
5. Akash
takes a uniform meter scale and suspends a weight of 2 N at one end 'X' and a weight
of 5 N on the other end 'Y'. He then balances the ruler horizonta11y on a knife
edge placed at 70 cm from X. Draw a diagram of the arrangement and calculate
the weight of the ruler.
2024
1. A
door lock is opened by turning the lever (handle) of length 0.2 m. If the
moment of force produced is 1 Nm, then the minimum force required is:
(a) 5 N (b) 10 N (c) 20
N (d) 0.2 N
2. (a)
When a stone tied to a string is rotated in a horizontal plane, the tension in
the string provides _________ force necessary for circular motion.
(b) Work done by this force at any
instant is _______.
3. A
non-uniform beam of weight 120 N pivoted at one end is shown in the diagram
below. Calculate the value of F to keep the beam in equilibrium.
4. (a)
Define Centre of Gravity.
(b) A hollow ice cream cone has
height 6 cm. Where is the position of its centre
of gravity from the broad base?
(c)Will its position change when it
is filled completely with honey? Write Yes
or No.
2023
1. Clockwise
moment produced by a force bout a fulcrum is considered to be:
(a) Positive (b) Negative (c) Zero (d) None of these
2. (a)
What is the position of centre of gravity of a triangular lamina?
(b) When this triangular lamina is
suspended freely from any one vertex, what is the moment of force produced by
its own weight in its rest position?
3. The
diagram shows wheel O pivoted at point A. Three equal force F1, F2 and F3 act
at point B on the wheel.
(a) Which force will produce maximum
moment about A?
(b) Give a reason for your answer in
(a).
4. A
metre scale of weight 50 gf can be balanced at 40 cm mark without any weight
suspended on it.
(a) If
this ruler is cut at its centre, then state which part [0 to 50 cm or 50 to 100
cm] of the ruler will weigh more than 25 gf.
(b) What
minimum weight placed on this metre ruler can balance this ruler when it is
pivoted at its centre?
2022
Semester-1
1. .
The diagram below shows the balanced position of a metre scale.
Which one of the following diagrams
shows the correct position of the scale when it is supported at the centre?
2. A
stone tied at the end of a string is whirled by hand in a horizontal circle
with uniform speed.
(i) Name the force required for this
circular motion
(a)
Centrifugal force.
(b)
Centripetal force.
(c)
Force of gravity.
(d)
Frictional force.
(ii) What is the direction of the
above-mentioned force?
(a)
Towards the centre of the circular path.
(b)
Away from the centre of the circular path'.
(c)
Normal to the radius at a point where the body is present on the circular path.
(d)
Direction of this force keeps on changing alternately towards and away from the
centre.
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