Class 9 Physics · Chapter 4 · Test 3
Centre of Mass
36 MCQs
36 questions · 30 min · 36 marks
Want to try first? Take the free Physics test: Fundamentals and SI Units
Sample questions
The first 5 of 36. Try each one, then tap to see the answer.
Question 1
The centre of gravity is the point where the body's total _____ appears to act.
- AVolume
- BWeight
- CDensity
- DAcceleration
Show answerHide answer
Answer: B
The textbook defines centre of gravity as the point where total weight appears to act.
Question 2
The centre of mass is the point where the body's whole _____ is assumed concentrated.
- AWeight
- BForce
- CMass
- DVolume
Show answerHide answer
Answer: C
The centre of mass represents the distribution of mass of a body or system.
Question 3
On Earth's surface, where g is nearly uniform, centre of mass and centre of gravity:
- AAlways differ greatly
- BCoincide
- CMust lie outside the body
- DAre always at the surface
Show answerHide answer
Answer: B
In a nearly uniform gravitational field, the two points coincide.
Question 4
For a uniform rectangular plate, the centre of gravity is at the:
- AOne corner
- BIntersection of diagonals
- CMidpoint of one edge
- DOutside the plate
Show answerHide answer
Answer: B
The centre of gravity of a regular rectangle is at the intersection of its diagonals.
Question 5
For a uniform circular plate, the centre of gravity is at its:
- ARim
- BCentre
- CTop edge
- DLowest point only
Show answerHide answer
Answer: B
The centre of a uniform circular plate is its centre of gravity.
More tests in Turning Effect of Forces
Practise with a free account
Save your scores, see which chapters need work, and keep a notebook of every question you got wrong.