NCERT Physics Class 11 Exemplar Ch 7 System Of Particles And Rotational Motion Part 2

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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

Plate with Hole

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

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