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NEET Physics : System of Particles and Rotational Motion

Multiple Choice Questions

161.

If the length of the second's hand in a stop-clock is 3 cm, the angular velocity and linear velocity of the tip is

0.2047 rad/s , 0.0314 ms^-1
0.2547 rad/s , 0.314 ms^-1
0.1472 rad/s , 0.06314 ms^-1
0.1047 rad/s , 0.00314 ms^-1

162.

The moment of inertia of a thin rod of mass M and length L, about an axis perpendicularto the rod at a distance $\frac{L}{4}$ from one end is

$\frac{{ML}^{2}}{6}$
$\frac{{ML}^{2}}{12}$
$\frac{7 {ML}^{2}}{24}$
$\frac{7 {ML}^{2}}{48}$

Short Answer Type

163.

A circular disc rolls down on an inclined plane without slipping. What fraction of its total energy is translational ?

Multiple Choice Questions

164.

Moment of a couple is called

impulse
couple
torque
angular momentum

165.

If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take

96 h
48 h
6 h
1.5 h

166.

Three identical spheres, each ofmass 1 kg are kept as shown in figure below, touching each other, with their centres on a straight line. If their centres are marked P, Q, R respectively, the distance of centre of mass of the system from P is

$\frac{PQ + PR + QR}{3}$
$\frac{PQ + PR}{3}$
$\frac{PQ + QR}{3}$
$\frac{PR + QR}{3}$

167.

Two blocks of equal masses m are released from the top of a smooth fixed wedge as shown in the figure. The acceleration of the centre of mass of the two blocks is

g
$\frac{g}{2}$
$\frac{3 g}{4}$
$\frac{g}{\sqrt{2}}$

168.

A motor is rotating at a constant angular velocity of 500 rpm. The angular displacement per second is

$\frac{3}{50 π} rad$
$\frac{3 π}{50} rad$
$\frac{25 π}{3} rad$
$\frac{50 π}{3} rad$

169.

A shell of mass 10 kg is moving with a velocity of 10 ms^-1 when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1^st mass is stationary, the velocity of the 2^nd is

1 m/s
10 m/s
100 m/s
1000 m/s

170.

The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge ofthe disc and normal to the disc is

MR²
$\frac{1}{2} {MR}^{2}$
$\frac{3}{2} {MR}^{2}$
$\frac{7}{2} {MR}^{2}$

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NEET Physics : System of Particles and Rotational Motion

Multiple Choice Questions

Short Answer Type

Multiple Choice Questions