4

# The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction in which the force acts. This statement is known as

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

None of these

B. Newton's second law of motion

4

Velocity

Acceleration

Momentum

None of these

4

# The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

2π. √(gh/kG² + h²)

2π. √(kG² + h²/gh)

1/2π. √(gh/kG² + h²)

1/2π. √(kG² + h²/gh)

4

# A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

Equal to

Less than

Greater than

Either (B) or (C)

4

# A smooth cylinder lying on a __________ is in neutral equilibrium.

Curved surface

Convex surface

Horizontal surface

None of these

4

# The term 'Centroid' is

The same as centre of gravity

The point of suspension

The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

None of the above

4

kW (kilowatt)

hp (horse power)

kcal/sec

kcal/kg sec

4

# Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

(BD³/12) - (bd³/12)

(DB³/12) - (db³/12)

(BD³/36) - (bd³/36)

(DB³/36) - (db³/36)

4

mr2/2

mr2/4

mr2/6

mr2/8

4

2mr2/3

2mr2/5

mr2

mr2/2

4

0° and 180°

180° and 0°

90° and 180°

90° and 0°

4

Equal to

Less than

Greater than

None of these

4

# According to law of triangle of forces

Three forces acting at a point will be in equilibrium

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

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

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

Dyne

Kilogram

Newton

Watt

4

kilogram

Newton

Watt

Dyne

4

# One joule means that

Work is done by a force of 1 N when it displaces a body through 1 m

Work is done by a force of 1 kg when it displaces a body through 1 m

Work is done by a force of 1 dyne when it displaces a body through 1 cm

Work is done by a force of 1 g when it displaces a body through 1 cm

4

# The resolved part of the resultant of two forces inclined at an angle θ in a given direction is equal to

The algebraic sum of the resolved parts of the forces in the given direction

The sum of the resolved parts of the forces in the given direction

The difference of the forces multiplied by the cosine of θ

The sum of the forces multiplied by the sine of θ

4

kg-m²

m²/kg.

kg/m²

kg/m

4

# In order to completely specify angular displacement by a vector, it must fix

Direction of the axis of rotation

Magnitude of angular displacement

Sense of angular displacement

All of these

4

# If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

More inclined when moving

Less inclined when moving

More inclined when standing

Less inclined when standing

4

α = 45° + φ/2

α = 45° - φ/2

α = 90° + φ

α = 90° - φ

4

# On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

Towards the wall at its upper end

Away from the wall at its upper end

Upwards at its upper end

Downwards at its upper end

4

# According to principle of moments

If a system of coplanar forces is in equilibrium, then their algebraic sum is zero

If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point

Positive and negative couples can be balanced

4

# Kinetic friction is the

Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction

Ratio of limiting friction and normal reaction

The friction force acting when the body is just about to move

The friction force acting when the body is in motion

4

Equal to

Less than

Greater than

None of these

4

# In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

P = W tan (α - φ)

P = W tan (α + φ)

P = W tan (φ - α)

P = W cos (α + φ)

4

Equal to one

Less than one

Greater than one

None of these

4

(1/2π). √(l/g)

(1/2π). √(g/l)

2π. √(l/g)

None of these

4

94.9 cm

99.4 cm

100 cm

101 cm

4

Weight

Velocity

Acceleration

Force