Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis ?

Related Mcqs:

1. A circular disc rotates at n rpm. The angular velocity of a circular ring of same mass and radius as the disc and to have the same angular momentum is___________________?

   A. n rpm
   B. n/2 rpm
   C. n/4 rpm
   D. 2n rpm

2. A disc of mass 4 kg, radius 0.5m and moment of inertia 3 kg-m2 rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is ___________________?

   A. 50 J
   B. 150 J
   C. 200 J
   D. 400 J

3. A symmetrical body is rotating about its axis of symmetry, its moment of inertia about the axis of rotation being 2 kg -m2 and its rate of rotation 2 revolutions/see. The angular momentum of the body in kg-m2/sec is_____________________?

   A. 4
   B. 6 7i
   C. 8TC
   D. 8

4. The unit of rotational inertia of a body in C.G.S system is________________?

   A. cm4
   B. kg-cm2
   C. gm-cm2
   D. gm-cm3

5. A flywheel of moment of inertia 20 kg-m” is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian persecond is__________________?

   A. 1/2
   B. 3/2
   C. 2
   D. 3

6. A ladder of weight ‘w’ rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight ‘w’ is to walk to the top of it safely, is tan’1 x, where x is___________________?

   A. 1/4
   B. 1/3
   C. 3
   D. 4

7. The angular speed of a car while taking a circular turn of radius 100m at 36 km/hour, is_______________?

   A. 0.1 radian/sec
   B. 1 radian/sec
   C. 100 radian/sec
   D. 1000 radian/sec

8. When a circular wheel rolls on a straight track, then the shape of body centrode and space centrode respectively are________________?

   A. straight line and parabola
   B. straight line and circle
   C. circle and straight line
   D. circle and parabola

9. The angular speed of a car taking a circular turn of radius 100 m at 36 km/hr will be___________________?

   A. 0.1 rad/sec
   B. 1 rad/sec
   C. 10 rad/sec
   D. 100 rad/sec

10. In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively_____________________?

    A. 50 and 75
    B. 75 and 50
    C. 75 and 75
    D. 50 and 50