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Dear Readers, Welcome to __ Engineering Mechanics Objective Questions and Answers__ have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of

(a) kilogram

(b) newton

(c) watt

(d) dyne

(e) joule.

Ans: b

(a) newton

(b) pascal

(c) kilogram metre

(d) watt

(e) joule.

Ans: e

(a) newton metre

(b) watt

(c) joule

(d) kilogram metre/sec.

(e) pascal per sec.

Ans: b

(a) one point

(b) two points

(c) plane

(d) perpendicular planes

(e) different planes.

Ans: a

(a) one point

(b) one plane

(c) different planes

(d) perpendicular planes

(e) different points.

Ans: b

(a) introduce internal stresses

(b) balance the other forces acting on it

(c) retard its motion

(d) change its motion

(e) all of the above.

Ans: e

(a) if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

(b) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equi¬librium

(c) if a polygon representing forces acting at a point is closed then forces are in equilibrium

(d) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium

(e) none of the above.

Ans: d

(a) magnitude

(b) direction

(c) position or line of action

(d) all of the above

(e) none of the above.

Ans: d

(a) not a replace them by a single force

(b) to replace them by a single force

(c) to replace them by a single force through C.G.

(d) to replace them by a couple

(e) to replace them by a couple and a force.

Ans: b

(a) magnitude

(b) direction

(c) point of application

(d) all of the above

(e) none of the above.

Ans: d

(a) P/2 cos 9/2

(b) IP sin 9/2

(c) 2P tan 9/2

(d) IP cos 9/2

(e) Psin 9/2.

Ans: d

(a) forces

(b) independence of forces

(c) dependence of forces

(d) balance of force

(e) resolution of forces.

Ans: e

(a) the algebraic sum of the resolved parts of the forces in the given direction

(b) the sum of the resolved parts of the forces in the given direction

(c) the difference of the forces multiplied by the cosine of 9

(d) the sum of the forces multiplied by the sine of 9

(e) the sum of the forces multiplied by the tangent of 9.

Ans: a

(a) Momentum and impulse

(b) Torque and energy

(c) Torque and work

(d) Kinetic energy and potential energy

(e) Moment of a force and angular momentum.

Ans: e

(a) angstrom

(b) light year

(c) micron

(d) millimetre

(e) milestone.

Ans: e

(a) kW (kilowatt)

(b) hp (horse power)

(c) kcal/sec

(d) kg m/sec

(e) kcal/kg sec.

Ans: e

(a) kcal

(b) kg m

(c) kWhr

(d) hp

(e) hp hr.

Ans: d

(a) kg/cm

(b) ata

(c) atmosphere

(d) mm of wcl

(e) newton.

Ans: e

(a) centripetal force of earth

(b) gravitational pull exerted by the earth

(c) forces experienced by body in atmos-phere

(d) force of attraction experienced by par-ticles

(e) gravitational force of attraction towards the centre of the earth.

Ans: e

(a) coplanar non-concurrent forces

(b) non-coplanar concurrent forces

(c) non-coplanar non-concurrent forces

(d) intersecting forces

(e) none of the above.

Ans: b

(a) coplanar force

(b) non-coplanar forces

(c) lever

(d) moment

(e) couple.

Ans: e

(a) time

(b) mass

(c) volume

(d) density

(e) acceleration.

Ans: e

(a) maximum when it acts at the centre of gravity of a body

(b) different at different points in its line of action

(c) the same at every point in its line of action

(d) minimum when it acts at the C.G. of the body

(e) none of the above.

Ans: c

(a) energy

(b) mass

(c) momentum

(d) angle

(e) speed.

Ans: c

(a) 2 and V6

(b) 3 and 1 kg

(c) V5andV5

(d) 2 and 5

(e) none of the above.

Ans: c

(a) their total sum is zero

(b) two resolved parts in two directions at right angles are equal

(c) sum of resolved parts in any two per-pendicular directions are both zero

(d) all of them are inclined equally

(e) none of the above.

Ans: c

(a) balance each other

(b) constitute a moment

(c) constitute a couple

(d) constitute a moment of couple

(e) constitute a resultant couple.

Ans: c

(a) if a system of coplanar forces is in equilibrium, then their algebraic sum is zero

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

(c) the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point

(d) positive and negative couples can be balanced

(e) none of the above.

Ans: b

(a) weight

(b) velocity

(c) acceleration

(d) force

(e) moment.

Ans: a

(a) three forces acting at a point will be in equilibrium

(b) three forces acting at a point can be represented by a triangle, each side being proportional to force

(c) if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equi¬librium

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

(e) none of the above.

Ans: c

(a) these forces are equal

(b) the lines of action of these forces meet in a point

(c) the lines of action of these forces are parallel

(d) (b) and (c) above

(e) none of the above.

Ans: d

(a) reducing the problem of kinetics to equivalent statics problem

(b) determining stresses in the truss

(c) stability of floating bodies

(d) designing safe structures

(e) solving kinematic problems.

Ans: a

(a) the floor is smooth, the wall is rough

(b) the floor is rough, the wall is smooth

(c) the floor and wall both are smooth sur¬faces

(d) the floor and wall both are rough sur-faces

(e) will be in equilibrium under all condi-tions.

Ans: c

(a) three forces acting at a point will be in equilibrium

(b) three forces acting at a point can be represented by a triangle, each side being proportional to force

(c) 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

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

(e) none of the above.

Ans: d

(a) balance each other

(b) produce a couple and an unbalanced force

(c) are equivalent

(d) produce a moment of couple

(e) can not balance each other.

Ans: e

(a) 2n-3

(b) n-l

(c) '2n-l

(d) n - 2

(e) 3n-2.

where n = number of joints in a frame

Ans: a

(a) resultant couple

(b) moment of the forces

(c) resulting couple

(d) moment of the couple

(e) none of the above.

Ans: d

(a) two members with unknown forces of the frame

(b) three members with unknown forces of the frame

(c) four members with unknown forces of the frame

(d) three members with known forces of the frame

(e) four members with two known forces.

Ans: b

(a) the centre of heavy portion

(b) the bottom surface

(c) the mid point of its axis

(d) all of the above

(e) none of the above.

Ans: c

(a) one-fourth of the total height above base

(b) one-third of the total height above base

(c) one-half of the total height above base

(d) three-eighth of the total height above the base

(e) none of the above.

Ans: a

(a) the point of C.G.

(b) the point of metacentre

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

(d) point of suspension

(e) the point in a body about which it can rotate horizontally and oscillate under the influence of gravity.

Ans: c

(a) one-fourth of the total height above base

(b) one-third of the total height above base

(c) one-half of the total height above base

(d) three-eighth of the total height above the base

(e) none of the above.

Ans: b

(a) kg m2

(b) m4

(c) kg/m2

(d) m3

(e) kg/m4.

Ans: b

(a) L/2

(b) L/3

(c) 3L/4

(d) 2L/3

(e) 3L/8.

Ans: d

(a) concurrence of the medians

(b) intersection of its altitudes

(c) intersection of bisector of angles

(d) intersection of diagonals

(e) all of the above.

Ans: a

(a) kg m2

(b) m4

(c) kg/m2

(d) kg/m

(e) m2/kg.

Ans: a

(a) compression or tension

(b) buckling or shear

(c) shear or tension

(d) all of the above

(e) bending.

Ans: a

(a) catenary

(b) parabola

(c) hyperbola

(d) elliptical

(e) circular arc.

Ans: b

(a) 2.5 cm

(b) 3.0 cm

(c) 4.0 cm

(d) 5.0 cm

(e) 2.0 cm.

Ans: c

(a) 0.5 cm

(b) 1.0 cm

(c) 1.5 cm

(d) 2.5 cm

(e) 0.25 cm.

Ans: a

(a) The C.G. of a circle is at its centre

(b) The C.G. of a triangle is at the inter¬section of its medians

(c) The C.G. of a rectangle is at the inter-section of its diagonals

(d) The C.G. of a semicircle is at a dis¬tance of r/2 from the centre

(e) The C-G. of an ellipse is at its centre.

Ans: d

(a) r/2

(b) 2r/3

(c) r/A

(d) 3r/2

(e) 3r/A.

Ans: d

(a) reaction of any smooth surface with which the body is in contact

(b) reaction of a rough surface of a body which rolls on it without slipping

(c) reaction at a point or an axis, fixed in space, around which a body is con-strained to turn

(d) all of the above

(e) none of the above.

Ans: d

(a) maximum

(b) minimum

(c) zero

(d) infinity

(e) same as the force applied.

Ans: c

(a) 20 kg, - ve sense

(b) 20 kg, + ve sense

(c) 10 kg, + ve sense

(d) 10 kg, - ve sense

(e) 45 kg, + ve sense.

Ans: a

(a) angle between normal reaction and the resultant of normal reaction and the limiting friction

(b) ratio of limiting friction and normal reaction

(c) the ratio of minimum friction force to the friction force acting when the body is just about to move

(d) the ratio of minimum friction force to friction force acting when the body is in motion

(e) ratio of static and dynamic friction.

Ans: a

(a) area of contact

(b) shape of surfaces

(c) strength of surfaces

(d) nature of surface

(e) all of the above.

Ans: d

(a) along the plane

(b) horizontally

(c) vertically

(d) at an angle equal to the angle of fric¬tion to the inclined plane

(e) unpredictable.

Ans: d

(a) coefficient of friction

(b) angle of friction

(c) angle of repose

(d) sliding friction

(e) friction resistance.

Ans: a

(a) the tangent of the angle of friction is equal to coefficient of friction

(b) the angle of repose is equal to angle of friction

(c) the tangent of the angle of repose is equal to coefficient of friction

(d) the sine of the angle of repose is equal to coefficient to friction

(e) none of the above.

Ans: d

(a) towards the wall at its upper end

(b) away from the wall at its upper end

(c) upwards at its upper end

(d) downwards at its upper end

(e) none of the above.

Ans: c

(a) downwards at its upper end

(b) upwards at its upper end

(c) perpendicular to the wall at its upper end

(d) zero at its upper end

(e) none of the above.

Ans: d

(a) post friction

(b) limiting friction

(c) kinematic friction

(d) frictional resistance

(e) dynamic friction.

Ans: e

(a) angle between normal reaction and the resultant of normal reaction and the limiting friction

(b) ratio of limiting friction and normal reaction

(c) the friction force acting when the body is just about to move

(d) the friction force acting when the body is in motion

(e) tangent of angle of repose.

Ans: b

(a) proportional to normal load between the surfaces

(b) dependent on the materials of contact surface

(c) proportional to velocity of sliding

(d) independent of the area of contact sur-faces

(e) none of the above is wrong statement.

Ans: c

(a) W

(b) W sin (a + $)

(c) Wtan(a + <|))

(d) W\an(a-<t>)

(e) Wtana.

Ans: c

(a) 3t2-lt

(b) 3t2+2t

(c) 6f-8

(d) 6f-4

(e) 6t2-8t.

Ans: c

(a) more inclined when moving

(b) less inclined when moving

(c) more inclined when standing

(d) less inclined when standing

(e) none of the above.

Ans: d

(a) 0°

(b) 30°

(c) 45°

(d) 60°

(e) 90°.

Ans: c

(a) tangent of angle between normal-reac-tion and the resultant of normal reac-tion and limiting friction

(b) ratio of limiting friction and normal reaction

(c) the friction force acting when the body is just about to move

(d) the friction force acting when the body is in motion

(e) minimum force of friction.

Ans: c

(a) bodies having relative motion

(b) two dry surfaces

(c) two lubricated surfaces

(d) solids and liquids

(e) electrically charged particles.

Ans: a

(a) same

(b) more

(c) less

(d) may be less of more depending on na-ture of surfaces and velocity

(e) has no correlation.

Ans: c

(a) kinetic friction

(b) limiting friction

(c) angle of repose

(d) coefficient of friction

(e) friction force.

Ans: d

(a) tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction

(b) ratio of limiting friction and normal reaction

(c) the friction force acting when the body is just about to move

(d) the friction force acting when the body is in motion

(e) dynamic friction.

Ans: d

(a) Wtan(a + <)>)

(b) Wtan(a-<)>)

(c) Wcos(a + <t>)

(d) Wsin(a + <(>)

(e) W (sin a + cos <j>).

Ans: a

(a) remain horizontal

(b) slant up towards direction of pull

(c) slant down towards direction of pull

(d) unpredictable

(e) none of the above.

Ans: c

(a) r/2

(b) r/A

(c) r/%

(d) 0.134 r

(e) 3r/8.

Ans: d

(a) equal to the moment of the couple

(b) constant

(c) both of above are correct

(d) both of above are wrong

(e) none of the above.

Ans: a

(a) balance each other

(b) cannot balance each other

(c) produce moment of a couple

(d) are equivalent

(e) none of the above.

Ans: b

(a) meet in a point

(b) be all parallel

(c) at least two of them must meet

(d) all the above are correct

(e) none of the above.

Ans: d

(a) limiting friction

(b) sliding friction

(c) rolling friction

(d) kinematic friction

(e) dynamic friction.

Ans: a

(a) nature of surfaces

(b), area of contact

(c) shape of the surfaces

(d) ail of the above.

(e) (a) and (b) above.

Ans: a

(a) coplanar

(b) meet at one point ;

(c) both (a) and (b) above

(d) all be equal

(e) something else.

Ans: c

(a) non-equilibrium

(b) partial equilibrium

(c) full equilibrium

(d) unpredictable

(e) none of the above.

Ans: a

(a) j-2

(b) 2j-l

(c) 2/-3

(d) 3/-2

(e) 2/ -4.

Ans: c

107. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly

(a) 38 m

(b) 62.5 m

(C) 96 m

(d) 124 m

(e) 240 m.

Ans: b

(a) 25

(b) 50

(c) 100

(d) 250

(e) 500.

Ans: b

(a) ellipse

(b) hyperbola

(c) parabola

(d) circle

(e) none of the above.

Ans: b

(a) kg m

(b) kcal

(c) wattr

(d) watt hours

(e) kg m x (m/sec)2.

Ans: c

(a) density of metal can't be determined

(b) metal is twice as dense as water

(c) metal will float in water

(d) metal is twice as dense as unknown fluid

(e) none of the above.

Ans: a

(a) at distance — from the plane base 3r

(b) at distance — from the plane base 3r

(c) at distance — from the plane base 3r

(d) at distance — from the plane base or

(e) at distance — from the plane base.

Ans: d

(a) right angled triangle

(b) equilateral triangle

(c) square

(d) circle

(e) rectangle.

Ans: a

(a) h/2

(b) J/3

(c) h/6

(d) h/4

(e) 3/i/5.

Ans: d

(a) same

(b) double

(c) half

(d) four times

(e) one fourth.

Ans: b

(a) arm of man

(b) pair of scissors

(c) pair of clinical tongs

(d) all of the above

(e) none of the above.

Ans: d

(a) zeioth order

(b) first order

(c) second order

(d) third order

(e) fourth order.

Ans: c

(a) W between P and F

(b) F between W and P

(c) P between W and F

(d) W, P and F all on one side

(e) none of the above.

Ans: a

(a) friction

(b) limiting friction

(c) repose

(d) kinematic friction

(e) static friction.

Ans: c

(a) mechanical advantage is greater than velocity ratio

(b) mechanical advantage is equal to velocity ratio

(c) mechanical advantage is less than velocity ratio

(d) mechanical advantage is unity

(e) none of the above.

Ans: c

(a) mechanical advantage is greater than velocity ratio

(b) mechanical advantage is equal to velocity ratio

(c) mechanical advantage is less than velocity ratio

(d) mechanical advantage is unity

(e) none of the above.

Ans: b

(a) straight line

(b) parabola

(c) hyperbola

(d) elliptical

(e) part of a circle.

Ans: b