# According to law of triangle of forces

1.  three forces acting at a point will be in equilibrium

2.  three forces acting at a point can be represented by a triangle, each side being proportional to force

3.  if three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

4.  if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

4

if three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

Explanation :
No Explanation available for this question

# The speed of sound in an ideal gas varies directly as its:

1.  pressure

2.  temperature

3.  density

4.  absolute temperature

4

absolute temperature

Explanation :
No Explanation available for this question

# If a rigid body is in equilibrium under the action of three forces, then

1.  these forces are equal

2.  the lines of action of these forces meet in a point

3.  the lines of action of these forces are parallel

4.  (b) and (c) above

4

(b) and (c) above

Explanation :
No Explanation available for this question

# Fluid is a substance that

1.  cannot be subjected to shear forces

2.  always expands until it fills any container

3.  has the same shear stress.at a point regardless of its motion

4.  cannot remain at rest under action of any shear force

4

cannot remain at rest under action of any shear force

Explanation :
No Explanation available for this question

# Fluid is a substance which offers no resistance to change of

1.  pressure

2.  flow

3.  shape

4.  volume

4

shape

Explanation :
No Explanation available for this question

# D' Alembert's principle is used for

1.  reducing the problem of kinetics to equivalent statics problem

2.  determining stresses in the truss

3.  stability of floating bodies

4.  designing safe structures

4

reducing the problem of kinetics to equivalent statics problem

Explanation :
No Explanation available for this question

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

1.  the floor is smooth, the wall is rough

2.  the floor is rough, the wall is smooth

3.  the floor and wall both are smooth surfaces

4.  the floor and wall both are rough surfaces

4

the floor and wall both are smooth surfaces

Explanation :
No Explanation available for this question

# According to Lami's theorem

1.  three forces acting at a point will be in equilibrium

2.  three forces acting at a point can be represented by a triangle, each side being proportional to force

3.  if three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

4.  if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

4

if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

Explanation :
No Explanation available for this question

# Two coplanar couples having equal and opposite moments

1.  balance each other

2.  produce a couple and an unbalanced force

3.  are equivalent

4.  cannot balance each other

4

cannot balance each other

Explanation :
No Explanation available for this question

1.  2n-3

2.  n-1

3.  2n-l

4.  n - 2

4