The ABC is a triangular plate of uniform thickness. The sides are in the ratio shown in the figure. I , I and I are the moments of inertia of the plate about AB, BC and CA respectively. Which one of the following relations one is correct ?
1
2
is maximum
3
4
Official Solution
Correct Option:
(4)
The intersection of medians is the centre of mass of the triangle. Since the distances of centre of mass from the sides is related as x . Therefore I > I > I or I > I .
02
PYQ 2012
easy
physicsID: neet-ug-
Two persons of masses and respectively, are at the opposite ends of a boat. The length of the boat is and weighs . The man walks up to the man and sits with him. If the boat is in still water the center of mass of the system shift by:
1
3.0 m
2
2.3 m
3
Zero
4
0.75 m
Official Solution
Correct Option:
(3)
Since net external force on the system is zero hence C.O.M. remains unchanged.
03
PYQ 2017
medium
physicsID: neet-ug-
Which of the following statements are correct?
Centre of mass of a body always coincides with the centre of gravity of the body.
Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
A couple on a body produce both translational and rotational motion in a body.
Mechanical advantage greater than one means that small effort can be used to lift a large load.
1
(b) and (d)
2
(a) and (b)
3
(b) and (c)
4
(c) and (d)
Official Solution
Correct Option:
(1)
The correct option is (A): (b) and (d).
04
PYQ 2020
medium
physicsID: neet-ug-
Two particles of mass and respectively are attached to the two ends of a rigid rod of length 1m with negligible mass. The centre of mass of the system from the particle is nearly at a distance of :
1
33 cm
2
50 cm
3
67 cm
4
80 cm
Official Solution
Correct Option:
(3)
Let position of centre of mass be
05
PYQ 2020
medium
physicsID: neet-ug-
Three identical spheres, each of mass , are placed at the corners of a right angle triangle with mutually perpendicular sides equal to (see figure). Taking the point of intersection of the two mutually perpendicular sides as the origin, find the position vector of centre of mass
1
2
3
4
Official Solution
Correct Option:
(3)
Position vector
About Centre Of Mass - NEET-UG
Centre Of Mass is a vital chapter for NEET-UG aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Centre Of Mass PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Centre Of Mass carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
