Test Index

JEE Advanced 2021 Full Test 2 Paper 1

(One or More than one correct type)
This section contains 06 multiple choice questions. Each question has FOUR options (A), (B), (C) and (D). ONE OR MORE THAN ONE of these four options is(are) correct.

Question : 7

Total: 54

A horizontal disc rotates freely about a vertical axis through it centre. A ring, having the same mass and radius as the disc, is now gently placed on the disc. After some time, the two rotate with a common angular velocity. Select the correct statements from the following.

Some friction exists between the disc and the ring
The angular momentum of the ‘disc plus ring’ is conserved.
The final common angular velocity is (2/3)rd of the initial angular velocity of the disc.
(2/3)rd of the initial kinetic energy changes to heat.

Validate

Go to Question:

Prev Question

Next Question