136. One cut quarter section is symmetrically from a uniform circular disc of radius R. The mass of this section is M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Moment of inertia of this section about the axis of rotation is 2MR (1) MR (2) 3 MR (3) 2 (4) 2MR2 137. A body of mass m and radius R rolling horizontally without slipping at a speed '' climbs a ramp to a height 3V2/4g. The rolling body would be (1) a sphere (2) a circular ring (3) a spherical shell (4) a circular disc 138. A particle executes a simple harmonic motion of time period T and amplitude A. The time taken by the particle to go 3 directly from x =A to the positive extreme (x = A) is T T (1) (2) 12 6 T T (3) (4) 139. An object suspended from a spring exhibits oscillation of period T. If spring is cut into two equal parts and joined to some object as shown in figure, the new time period of oscillation will be (3) 272 TTA 140. The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If t, is the time for planet to move from C to D and t is the time to move from A to B then B m C S (1) =12 (3) t =42 D (2)