** Question No : 1**

A smooth cylinder lying on its convex surface remains

In stable equilibrium

In unstable equilibrium

In neutral equilibrium

Out of equilibrium

** Question No : 2**

Which one of the following statements is true?

The tangent of the angle of friction is equal to coefficient of friction

The angle of repose is equal to angle of friction

The tangent of the angle of repose is equal to coefficient of friction

All the above

** Question No : 3**

A body is said to move with Simple Harmonic Motion if its acceleration, is

Always directed away from the centre, the point of reference

Proportional to the square of the distance from the point of reference

Proportional to the distance from the point of reference and directed towards it

Inversely proportion to the distance from the point of reference

** Question No : 4**

The forces which meet at one point and have their lines of action in different planes are called

Coplanar non-concurrent forces

Non-coplanar concurrent forces

Non-coplanar non-current forces

Intersecting forces

** Question No : 5**

The Law of Polygon of Forces states that

If a polygon representing the forces acting at point in a body is closed, the forces are in equilibrium

If forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon

If forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

If forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium

** Question No : 6**

A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be

48 kg

60 kg

72 kg

None of these

** Question No : 7**

A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if

Floor is smooth and wall is rough

Floor is rough and wall is smooth

Both floor and wall are rough

Both floor and wall are smooth