Strength Of Materials Mcqs – (Civil Engineering) MCQs Latest For FPSC, PPSC, NTS, KPPSC, SPSC & Other Tests
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The unit of power in S.I. units is______________?
A. joule
B. watt
C. newton meter
D. kilogram meter/sec
E. pascal per sec
Forces are called coplanar when all of them acting on body lie in________________?
A. different planes
B. one plane
C. one point
D. perpendicular planes
E. different points
Effect of a force on a body depends upon________________?
A. direction
B. magnitude
C. position or line of action
D. all of the above
E. none of the above
A force is completely defined when we specify________________?
A. direction
B. magnitude
C. point of application
D. all of the above
E. none of the above
The unit of force in S.I. units is_________________?
A. watt
B. newton
C. kilogram
D. dyne
E. joule
Forces are called concurrent when their lines of action meet in_______________?
A. one point
B. plane
C. two points
D. perpendicular planes
E. different planes
A force acting on a body may_______________?
A. retard its motion
B. balance the other forces acting on it
C. introduce internal stresses
D. change its motion
E. all of the above
If a number of forces act simultaneously on a particle, it is possible_________________?
A. to replace them by a couple
B. to replace them by a single force
C. to replace them by a single force through C.G.
D. not a replace them by a single force
E. to replace them by a couple and a force
If two equal forces of magnitude P act at an angle 9°, their resultant will be________________?
A. IP sin 9/2
B. P/2 cos 9/2
C. 2P tan 9/2
D. IP cos 9/2
E. Psin 9/2
Which of the following do not have identical dimensions ?
A. Torque and energy
B. Momentum and impulse
C. Torque and work
D. Kinetic energy and potential energy
E. Moment of a force and angular momentum
Which of the following is not the unit of power ?
A. kcal/sec
B. hp (horse power)
C. kW (kilowatt)
D. kg m/sec
E. kcal/kg sec
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of__________________?
A. independence of forces
B. forces
C. dependence of forces
D. balance of force
E. resolution of forces
Which is the correct statement about law of polygon of forces ?
A. if a polygon representing forces acting at a point is closed then 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 equilibrium
C. 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
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
The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?
A. the algebraic sum of the resolved parts of the forces in the given direction
B. the difference of the forces multiplied by the cosine of 9
C. the sum of the resolved parts of the forces in the given direction
D. the sum of the forces multiplied by the sine of 9
E. the sum of the forces multiplied by the tangent of 9
Which of the following is not the unit of distance ?
A. light year
B. angstrom
C. micron
D. millimeter
E. milestone
Which of the following is not the unit of work, energy and heat ?
A. kg m
B. kcal
C. kWhr
D. hp
E. hp hr
The weight of a body is due to____________________?
A. gravitational pull exerted by the earth
B. centripetal force of 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
When trying to turn a key into a lock, following is applied___________________?
A. non-coplanar forces
B. coplanar force
C. lever
D. moment
E. couple
According to principle of transmissibility of forces, the effect of a force upon a body is_______________?
A. maximum when it acts at the center of gravity of a body
B. minimum when it acts at the C.G. of the body
C. the same at every point in its line of action
D. different at different points in its line of action
E. none of the above
A number of forces acting at a point will be in equilibrium if_________________?
A. two resolved parts in two directions at right angles are equal
B. their total sum is zero
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
Which of the following is not a vector quantity_______________?
A. weight
B. acceleration
C. velocity
D. force
E. moment
D’ Alembert’s principle is used for___________________?
A. reducing the problem of kinetics to equivalent statics problem
B. stability of floating bodies
C. determining stresses in the truss
D. designing safe structures
E. solving kinematic problems
According to Lami’s theorem________________?
A. three forces acting at a point will be in equilibrium
B. 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
C. three forces acting at a point can be represented by a triangle, each side being proportional to force
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
A framed structure is perfect if it contains members equal to________________?
A. 2n-3
B. 2n-l
C. n-l
D. n – 2
E. 3n-2
In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than___________________?
A. four members with unknown forces of the frame
B. three members with unknown forces of the frame
C. two members with unknown forces of the frame
D. three members with known forces of the frame
E. four members with two known forces
Center of gravity of a solid cone lies on the axis at the height_______________?
A. one-fourth of the total height above base
B. one-half of the total height above base
C. one-third of the total height above base
D. three-eighth of the total height above the base
E. none of the above
Center of gravity of a thin hollow cone lies on the axis at a height of________________?
A. one-half of the total height above base
B. one-third of the total height above base
C. one-fourth of the total height above base
D. three-eighth of the total height above the base
E. none of the above
The units of moment of inertia of mass are_____________________?
A. kg m2
B. kg/m2
C. m4
D. kg/m
E. m2/kg
A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve___________________?
A. catenary
B. parabola
C. elliptical
D. hyperbola
E. circular arc
From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the center of circular plate___________________?
A. 0.5 cm
B. 1.5 cm
C. 1.0 cm
D. 2.5 cm
E. 0.25 cm
The center of percussion of the homogeneous rod of length L suspended at the top will be__________________?
A. L/2
B. 3L/4
C. L/3
D. 2L/3
E. 3L/8
The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be______________?
A. 2r/3
B. r/2
C. r/A
D. 3r/2
E. 3r/A
If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be___________________?
A. minimum
B. maximum
C. zero
D. infinity
E. same as the force applied
Angle oT friction is the___________________?
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 friction force acting when the body is in motion
D. the ratio of minimum friction force to the friction force acting when the body is just about to move
E. ratio of static and dynamic friction
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction__________________?
A. along the plane
B. vertically
C. horizontally
D. at an angle equal to the angle of friction to the inclined plane
E. unpredictable
Which one of the following statements is not correct_________________?
A. the angle of repose is equal to angle of friction
B. the tangent of the angle of friction is equal to coefficient 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
On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be__________________?
A. upwards at its upper end
B. downwards at its upper end
C. perpendicular to the wall at its upper end
D. zero at its upper end
E. none of the above
Coefficient of friction is the__________________?
A. tangent of angle of repose
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. angle between normal reaction and the resultant of normal reaction and the limiting friction
A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to___________________?
A. W sin (a + $)
B. W
C. Wtan(a + <|))
D. Wan(a-)
E. Wtana
If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella_________________?
A. less inclined when moving
B. more inclined when moving
C. more inclined when standing
D. less inclined when standing
E. none of the above
Dynamic friction as compared to static friction is________________?
A. more
B. same
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation
Kinetic friction is the________________?
A. the friction force acting when the body is just about to move
B. ratio of limiting friction and normal reaction
C. tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction
D. the friction force acting when the body is in motion
E. dynamic friction
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will____________________?
A. slant up towards direction of pull
B. remain horizontal
C. slant down towards direction of pull
D. unpredictable
E. none of the above
The algebraic sum of moments of the forces forming couple about any point in their plane is________________?
A. equal to the moment of the couple
B. constant
C. both of above are wrong
D. both of above are correct
E. none of the above
If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either__________________?
A. be all parallel
B. meet in a point
C. at least two of them must meet
D. all the above are correct
E. none of the above
The co-efficient of friction depends upon________________?
A. nature of surfaces
B., shape of the surfaces
C. area of contact
D. ail of the above.
E. A. and B. above
If three forces acting in different planes can be represented by a triangle, these will be in________________?
A. non-equilibrium
B. full equilibrium
C. partial equilibrium
D. unpredictable
E. none of the above
Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one________________?
A. parabola
B. hyperbola
C. ellipse
D. circle
E. none of the above
The C.G. of a plane lamina will not be at its geometrical centre in the case of a______________?
A. right angled triangle
B. square
C. equilateral triangle
D. circle
E. rectangle
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is_________________?
A. half
B. double
C. same
D. four times
E. one fourth
A pair of smith’s tongs is an example of the lever of__________________?
A. first order
B. zeioth order
C. second order
D. third order
E. fourth order
The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of__________________?
A. limiting friction
B. friction
C. repose
D. kinematic friction
E. static friction
In ideal machines________________?
A. mechanical advantage is unity
B. mechanical advantage is equal to velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is greater than velocity ratio
E. none of the above.
In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
A. W between P and F
B. P between W and F
C. F between W and P
D. W, P and F all on one side
E. none of the above
In actual machines______________?
A. mechanical advantage is equal to velocity ratio
B. mechanical advantage is greater than velocity ratio
C. mechanical advantage is less than velocity ratio
D. mechanical advantage is unity
E. none of the above
Which of the following is the example of lever of first order________________?
A. pair of scissors
B. arm of man
C. pair of clinical tongs
D. all of the above
E. none of the above
The C.G. of a right circular solid cone of height h lies at the following distance from the base_____________?
A. J/3
B. h/2
C. h/6
D. h/4
E. 3/i/5
The C.G. of a solid hemisphere lies on the central radius 3r_______________?
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
A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly________________?
A. 96 m
B. 62.5 m
C. 38 m
D. 124 m
E. 240 m
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal________________?
A. density of metal can’t be determined
B. metal will float in water
C. metal is twice as dense as water
D. metal is twice as dense as unknown fluid
E. none of the above
Which of the following is not the unit of energy________________?
A. kcal
B. kg m
C. wattr
D. watt hours
E. kg m x (m/sec)2
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to______________?
A. 100
B. 50
C. 25
D. 250
E. 500
If n = number of members andy = number of joints, then for a perfect frame, n =_______________?
A. 2j-l
B. j-2
C. 2/-3
D. 3/-2
E. 2/ -4
The necessary condition for forces to be in equilibrium is that these should be_______________?
A. meet at one point
B. coplanar
C. both A. and B. above
D. all be equal
E. something else
The maximum frictional force which comes into play when a body just begins to slide over another surface is called_____________________?
A. limiting friction
B. rolling friction
C. sliding friction
D. kinematic friction
E. dynamic friction
A single force and a couple acting in the same plane upon a rigid body________________?
A. are equivalent
B. cannot balance each other
C. produce moment of a couple
D. balance each other
E. none of the above
A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of__________________?
A. r/A
B. r/2
C. r/%
D. 0.134 r
E. 3r/8
The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to_________________?
A. Wtan(a + )
B. Wcos(a + )
C. Wtan(a – )
D. Wsin(a + )
E. W (sin a + cos )
Tangent of angle of friction is equal to_________________?
A. limiting friction
B. kinetic friction
C. angle of repose
D. coefficient of friction
E. friction force
Coulomb friction is the friction between_________________?
A. bodies having relative motion
B. two lubricated surfaces
C. two dry surfaces
D. solids and liquids
E. electrically charged particles
A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_________________?
A. 30°
B. 0°
C. 45°
D. 60°
E. 90°
A particle moves along a straight line such that distance (x) traversed in t seconds is given by x = t2 (t – 4), the acceleration of the particle will be given by the equation_________________?
A. 3t2+2t
B. 3t2-lt
C. 6f-8
D. 6f-4
E. 6t2-8t
Pick up wrong statement about friction force for dry surfaces. Friction force is________________?
A. dependent on the materials of contact surface
B. proportional to normal load between the surfaces
C. proportional to velocity of sliding
D. independent of the area of contact surfaces
E. none of the above is wrong statement
Frictional force encountered after commencement of motion is called________________?
A. limiting friction
B. post friction
C. kinematic friction
D. frictional resistance
E. dynamic friction
On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be__________________?
A. away from the wall at its upper end
B. towards the wall at its upper end
C. upwards at its upper end
D. downwards at its upper end
E. none of the above
The ratio of limiting friction and normal reaction is known as_______________?
A. coefficient of friction
B. angle of repose
C. angle of friction
D. sliding friction
E. friction resistance
The coefficient of friction depends on_________________?
A. shape of surfaces
B. area of contact
C. strength of surfaces
D. nature of surface
E. all of the above
The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?
A. 20 kg, – ve sense
B. 10 kg, + ve sense
C. 20 kg, + ve sense
D. 10 kg, – ve sense
E. 45 kg, + ve sense
In the equation of virtual work, following force is neglected_______________?
A. reaction of a rough surface of a body which rolls on it without slipping
B. reaction of any smooth surface with which the body is in contact
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
Pick up the incorrect statement from the following _______________?
A. The C-G. of an ellipse is at its center
B. The C.G. of a triangle is at the intersection 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 distance of r/2 from the center
E. The C.G. of a circle is at its center
A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span________________?
A. 3.0 cm
B. 2.5 cm
C. 4.0 cm
D. 5.0 cm
E. 2.0 cm
The possible loading in various members of framed structures are_______________?
A. compression or tension
B. shear or tension
C. buckling or shear
D. all of the above
E. bending
The center of gravity of a triangle lies at the point of__________________?
A. concurrence of the medians
B. intersection of diagonals
C. intersection of bisector of angles
D. intersection of its altitudes
E. all of the above
The units of moment of inertia of an area are_______________?
A. kg/m2
B. m4
C. kg m2
D. m3
E. kg/m4
Center of percussion is______________?
A. the point of metacentre
B. the point of C.G.
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
The center of gravity of a uniform lamina lies at_______________?
A. the bottom surface
B. the center of heavy portion
C. the mid point of its axis
D. all of the above
E. none of the above
The product of either force of couple with the arm of the couple is called________________?
A. moment of the forces
B. resultant couple
C. resulting couple
D. moment of the couple
E. none of the above
Two coplanar couples having equal and op-posite moments_________________?
A. are equivalent
B. produce a couple and an unbalanced force
C. balance each other
D. produce a moment of couple
E. can not balance each other
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A. the floor is rough, the wall is smooth
B. the floor is smooth, the wall is rough
C. the floor and wall both are smooth surfaces
D. the floor and wall both are rough sur-faces
E. will be in equilibrium under all condi-tions
If a rigid body is in equilibrium under the action of three forces, then_______________?
A. these forces are equal
B. the lines of action of these forces are parallel
C. the lines of action of these forces meet in a point
D. B. and C. above
E. none of the above
According to principle of moments_________________?
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. positive and negative couples can be balanced
D. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
E. none of the above
According to law of triangle of forces______________?
A. three forces acting at a point can be represented by a triangle, each side being proportional to force
B. three forces acting at a point will be in equilibrium
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 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
Two non-collinear parallel equal forces acting in opposite direction________________?
A. constitute a moment
B. balance each other
C. constitute a couple
D. constitute a moment of couple
E. constitute a resultant couple
The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are____________________?
A. 3 and 1 kg
B. 2 and V6
C. V5andV5
D. 2 and 5
E. none of the above
Which of the following is not a scalar quantity__________________?
A. mass
B. time
C. volume
D. density
E. acceleration
The forces, which meet at one point, but their lines of action do not lie in a plane, are called______________?
A. non-coplanar non-concurrent forces
B. non-coplanar concurrent forces
C. coplanar non-concurrent forces
D. intersecting forces
E. none of the above
Which of the following is not the unit of pressure ?
A. atmosphere
B. ata
C. kg/cm
D. mm of wcl
E. newton
The unit of work or energy in S.I. units is________________?
A. pascal
B. newton
C. kilogram meter
D. watt
E. joule