NCERT Physics Class 11 Exemplar Ch 7 System of Particles and Rotational Motion Part 2 (For CBSE, ICSE, IAS, NET, NRA 2023)

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MCQs Type Questions

Q. 5 A uniform square plate has a small piece Q of an irregular shape removed and glued to the center of the plate leaving a hole behind (Fig.) . The moment of inertia about the z-axis is then

Plate with Hole

(a) increased

(b) decreased

(c) the same

(d) changed in unpredicted manner.

Answer: b

Q. 6 In problem 7.5, the CM of the plate is now in the following quadrant of x-y plane,

(a) I

(b) II

(c) III

(d) IV

Answer: C

Q. 7. The density of a non-uniform rod of length 1m is given where a and b are constants and .

The centre of mass of the rod will be at

(a)

(b)

(c)

(d)

Answer: When , the density becomes uniform and hence the centre of mass is at .

Only option (a) tends to

Q. 8 A Merry-go-round, made of a ring-like platform of radius and mass , is revolving with angular speed . A person of mass is standing on it. At one instant, the person jumps off the round, radially away from the centre of the round (as seen from the round) . The speed of the round afterwards is

(a)

(b)

(c)

(d)

Answer: b