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SA2 Mechanics & Strength of Materials

Total questions: 72

Worksheet time: 36mins

Name
Class
Date
1.

Study of motion with reference to the force which causes the motion is

a)

Statics

b)

Kinetics

c)

Dynamics

d)

Kinematics

2.

An impulse causes

a)

The object's momentum to change

b)

The object's momentum to increase

c)

The object's momentum to decrease

d)

The object's momentum to remain constant or be conserved

3.

Momentum is a property related to the objects ________.

a)

Motion and mass

b)

Motion and velocity

c)

Mass and acceleration

d)

Weight and velocity

4.

Centrifugal force is________.

a)

Directly proportional to the radius of the curvature

b)

Directly proportional to the square of the weight of the object

5.

A measure of the resistance of a body it offers to any change in its angular velocity, determined by the mass and distribution of its mass about the axis of rotation is known as

a)

Moment of inertia

b)

Friction

c)

Torsion

d)

Angular Acceleration

6.

Momentum is the product of mass and

a)

Acceleration

b)

Force

c)

Velocity

d)

Time

7.

The moment of inertia of a plane figure, ____.

a)

Increases as distance of the axis moves farther from the centroid

b)

Is zero at the centroidal axis

c)

is maximum at the centroidal axis

d)

Decreases as the distance of the axis moves farther from centroid

8.

To maximize the horizontal range of the projectile, which of the following applies?

a)

Maximize Velocity

b)

Minimize the angle of elevation

c)

Maximize the angle of elevation

d)

The tangent function of the angle and velocity of trajectory must be equal to 1

9.

Moment of inertia of any plane figure is expressed in units of length of the

a)

First power

b)

Third power

c)

Second power

d)

Fourth power

10.

A branch of physical science which deals with state of rest or motion of bodies under the action of forces

a)

Mechanics

b)

Kinematics

c)

Statics

11.

A branch of mechanics which deals with bodies at rest.

a)

Statics

b)

Kinetics

c)

Dynamics

d)

Kinematics

12.

Branch of mechanics which deals with bodies in motion

a)

Statics

b)

Kinetics

c)

Dynamics

d)

Kinematics

13.

The action of a force is characterized by

a)

Its magnitude

b)

Point of application

c)

The direction of its action

d)

All of these

14.

For the system to be equilibrium,

a)

The force polygon must close

b)

It must satisfy the 3 statics equations

c)

All forces must be concurrent, if not acting parallel

d)

All of these

15.

A pair of forces equal in the magnitude, opposite in direction, and not in the same line is called

a)

Moment

b)

Couple

c)

Torque

d)

All of these

16.

The ______ exerted by a force on a body is the measure of its effectiveness in turning the body about a certain pivot

a)

Couple

b)

Moment arm

c)

Torque

d)

All of these

17.

A body is said to be in "rotational equilibrium" when

a)

No net torque acts on it

b)

Its vector sum of the forces is zero

c)

No net force acts on it

d)

The forces acting on the body are non-concurrent

18.

A couple consists of two forces, _____ in magnitude, parallel and opposite directed.

a)

Directly Proportional

b)

Unequal

c)

Equal

d)

Inversely Proportional

19.

The _______ of the body or system is the point about with the product of the mass and the moment arm sums up to zero

a)

Center of gravity

b)

Centroid

c)

Center of mass

d)

All of the above

20.

The point through which the resultant of the distributed gravity force passes regardless of the orientation of the body is space

a)

Center of inertia

b)

Center point

c)

Center of mass

d)

Center of gravity

21.

If an object exerts a normal force on a surface, then its normal force is

a)

Equal to the weight of the object

b)

Parallel to the surface

c)

Parallel to the surface

d)

Perpendicular to the surface

22.

Whenever the surfaces of two bodies are in contact. There will be a limiting amount of resistance to sliding bet them. This is known as

a)

Friction

b)

Angle of friction

c)

Coefficient of friction

d)

Coefficient of sliding

23.

The moment of inertia of a triangle with respect to the base b is

a)

bh3 /12

b)

bh3 /36

c)

bh3 /6

d)

bh3 /3

24.

The moment of inertia f a triangle with respect to the base is ______ time is moment of inertia with respect to its centroidal axis?

a)

2

b)

3

c)

4

d)

5

25.

What is the moment of inertia of a circle

a)

π 4 /16

b)

π 4  /24

c)

π 4  /2

d)

π 4  /4

26.

The moment of inertia of the circle with respect to its tangent is________ times its centroidal moment of inertia.

a)

2

b)

3

c)

4

d)

5

27.

The moment of inertia of rectangle with respect to be the base is ______ times its moment of inertia with respect to the centroid

a)

2

b)

3

c)

4

d)

5

28.

What is the mass moment of inertia of a sphere of mass m and radius r?

a)

1/2 mr2

b)

1/3 mr2

c)

1/4 mr2

d)

2/5 mr2

29.

Given a cylinder of radius r, altitude h and mass m. what is its mass of inertia?

a)

1/2 mr2

b)

1/3 mr2

c)

1/4 mr2

d)

2/5 mr2

30.

A structure is called ______ if at least one of its individual members is a multi-force member.

a)

Truss

b)

Three-hinged arch

c)

Frame

d)

Bridge

31.

Another term of moment of inertia.

a)

Moment of area

b)

Moment of mass

c)

Second moment of area

d)

All of the above

32.

The diagram of an isolated body with the representation of all external forces acting on it is called

a)

Maxwell diagram

b)

Free body diagram

c)

Stress-strain diagram

d)

Shear and moment diagram

33.

A framework composed of members joined at their ends to form a rigid structure

a)

Machine

b)

Joist

c)

Truss

d)

Purlin

34.

The moment of the resultant of two concurrent forces with respect to a center of their planes is equal to the algebraic sum of the moments of the components with respect to the same center,

a)

Law of reaction

b)

Mass moment of inertia

c)

Varignon's theorem

d)

Law of inertia

35.

The condition exist I structures where the reactive forces exceed the number of independent equations for equilibrium. Such case is called

a)

Statically determine

b)

Static equilibrium

c)

Statically indeterminate

d)

None of the above

36.

Two lengths of a steel wire are used to support a chandelier of weight a. The tension in the wire must

a)

Each be W/2

b)

Have a vector sum of magnitude w

c)

Each be W

d)

Have a vector sum of magnitude > w

37.

The built-in or fixed support is capable of supporting

a)

An axial load

b)

A bending moment

c)

A transverse load

d)

All of these

38.

Which of the following BEST describes d'Alembert's principle?

a)

F=ma

b)

Stress is directly proportional to strain

c)

First law of motion

d)

F=kx

39.

The theorem which is closely related to d'Alembert's theorem is the

a)

Newton's first law of motion

b)

Newton's second law of motion

c)

Newton's third law of motion

d)

Bernoulli's motion

40.

_________ is the quality of being plastically elongated

a)

Flexible

b)

Malleability

c)

Plasticity

d)

Ductility

41.

It is the ratio og the ultimate stress to the allowable stress.

a)

Proportionality constant

b)

Factor of safety

c)

Strain

d)

Modulus

42.

The greatest unit pressure the soil can continuously stand is called

a)

Bearing strength

b)

Ultimate strength

c)

Yield strength

d)

Fatigue strength

43.

The distance that the top surface is displaced in the direction of the force divided by the thickness of the body is known as

a)

Longitudinal strain

b)

Shear strain

c)

Linear strain

d)

Volume strain

44.

The ratio of the tensile stress to tensile strain

a)

Shear modulus

b)

Bulk modulus

c)

Modulus of elasticity

d)

Hooke's law

45.

Another term of modulus elasticity

a)

Bulk modulus

b)

Young's modulus

c)

Shear modulus

d)

Moment of inertia

46.

What is the value of the modulus of elasticity of steel?

a)

200 Gpa

b)

150 Mpa

c)

200 Mpa

d)

150Gpa

47.

The slope of the stress-strain diagram in the linearly elastic region is called

a)

Yield strength

b)

Elastic limit

c)

Proportional limit

d)

Modulus of elasticity

48.

The modulus of elasticity in shear is commonly called as

a)

Modulus of rigidity

b)

Bulk modulus

c)

Young's modulus

d)

Deformation

49.

A kind of stress caused by forces acting along a parallel to the area resisting the forces.

a)

Tangential

b)

Shearing stress

c)

Compressive mass

d)

Tensile stress

50.

A kind of stress caused by forces acting perpendicular to the area resisting the forces.

a)

Tangential stress

b)

Diagonal stress

c)

Shearing stress

d)

Bearing stress

51.

Refers to the highest ordinate on the stress-strain diagram.

a)

Rapture strength

b)

Yield strength

c)

Ultimate strength

d)

Allowable strength

52.

At highest or lowest point on the moment diagram

a)

Shear is maximum

b)

Shear is half the maximum moment

c)

Shear is zero

d)

Shear is negative

53.

For symmetrically loaded simple bam the maximum shear occurs at

a)

The midspan

b)

1/3 from the support

c)

The support

d)

1/4 the suppor

54.

For symmetrically loaded simple beam, the maximum moment occurs at

a)

The midspan

b)

1/3 from the support

c)

The support

d)

1/4 from the support

55.

Poisson ratio is

a)

The ratio of the stress to strain

b)

The other term for factor of safety

c)

The other term for slenderness ratio

d)

The ratio of the unit lateral deformation to the unit longitudinal deformation*

56.

Which of the following is NOT a method of determining the bar force of a truss member.

a)

Method of joints

b)

Method of virtual work

c)

Method of section

d)

Maxwell diagram

57.

The actual stress the material has when under load.

a)

Allowable stress

b)

Working stress

c)

Ultimate stress

d)

Factor of safety

58.

The ratio of the volume stress to the volume strain is called

a)

Young's modulus

b)

Bulk modulus

c)

Shear modulus

d)

Hooke's law

59.

A kind of stress that is caused by forces acting along or parallel to the area resisting the force.

a)

Tensile stress

b)

Shearing stress

c)

Bearing stress

d)

Tangential stress

60.

Stress is proportional to strain. The constant of proportionality is called as young's modulus. Who introduced this 1807?

a)

Sean young

b)

James young

c)

Neil young

d)

Thomas young

61.

Obtained by dividing the differential load dP by the differential area dA over which it acts

a)

Stress

b)

Elongation

c)

Strain

d)

Elasticity

62.

What is the SI unit for stress?

a)

Pascal

b)

Psi

c)

Joules

d)

Kg/cm2

63.

Unit strain is

a)

Inversely proportional to the unit stress

b)

Unit less

c)

Expressed in Pascal's

d)

Directly proportional to the length of the object

64.

The ratio of unit deformation or strains in a transverse direction is constant for stresses within the proportional limit. This is known as

a)

Hooke's Law

b)

Poisson Ratio

c)

Mohr's Circle

d)

Slenderness Ratio

65.

The stress beyond which the material will not return to its original shape when unloaded but will retain a permanent deformation

a)

Proportional limit

b)

Yield limit

c)

Elastic limit

d)

Yield strength

66.

A simple beam carrying a uniform load of w throughout its entire length L has maximum moment of

a)

wL/2

b)

wL2 /4

c)

wL2 /2

d)

wL2 /8

67.

The moment of inertia of a rectangular whose base is B and height H, about its base is

a)

bh3 /12

b)

bh3 /3

c)

bh3 /4

d)

bh3 /36

68.

In general design, stress and factor of safety are related as follows:

a)

Design stress = ultimate stress x factor of safety

b)

Design stress = ultimate stress/factor of safety

c)

Factor of safety = Design stress/ultimate stress

d)

Ultimate stress = Factor of safety/Design stress

69.

The dimension of "Acceleration x Mass" is the same as that to

a)

Power

b)

Work

c)

Length

d)

Weight

70.

Galvanized iron is a term referring to iron coated with

a)

Aluminum

b)

Tin

c)

Magnesium

d)

Zinc

71.

In a cantilever beam with a concentrated load at the free end, the moment is

a)

Maximum at the wall

b)

Constant along the beam

c)

1/4 Maximum half way out on the beam

d)

Maximum at the free end

72.

The coefficient of friction for dry surfaces

a)

Depends on the composition of the materials only

b)

Depends only on the finish condition of the surface

c)

Depends on the materials and the finish condition of the surfaces

d)

Does not depend on the material