1421. Angular momentum is a :
A. Vector (axial) *
B. Vector (Polar)
C. Scalar
D. None of these
1422. What remains constant when the earth revolves around the sun ?
A. Angular momentum *
B. Linear momentum
C. Angular kinetic energy
D. Linear kinetic energy
1423. A couple produces :
A. Purely linear motion
B. Purely rotational motion *
C. Linear and rotational motion
D. Vibratory motion
1424. In which case application of angular velocity is useful ?
A. When a body is rotating *
B. When a body’s velocity follows a straight line.
C. When a body’s velocity follows a straight line.
D. None of these
1425. A cyclist bends while taking a turn to :
A. Reduce friction
B. Generate required centripetal force *
C. Reduce apparent weight
D. Reduce speed
1426. A stone attached to a string is being whirled in a vertical circle. The string is likely to break when the stone is :
A. At the lowest position *
B. At the highest position
C. At any point during motion
D. None of the above
1427. A cylinder cannot roll on :
A. A rough horizontal plane
B. A smooth horizontal plane
C. A rough inclined plane
D. A smooth inclined plane *
1428. Rotatory motion of a body is produced by applying a :
A. Couple *
B. Impulse of a force
C. Force
D. None of these
1429. A 4 KG mass and a 1 KG mass are moving with equivalent energies . the proportion of the extents of their direct momenta is
A. 1:2
B. 1:1
C. 2:1 *
D. 4:1
1430. A Particle reaches its highest point when it has covered exactly one half of its horizontal range. The corresponding point on the displacement time is characterized by :
A. Negative slope and zero curvature
B. Zero slope and negative curvature
C. Zero slope an positive curvature *
D. Positive slope and zero curvature