**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