final mechanics quiz ppt 21 1 .11.09

8/2/2019 Final Mechanics Quiz Ppt 21 1 .11.09

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ENGINEERING MECHANICSQUIZ


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Question - 1

If the resultant of the given force system is a couple,

the magnitude of force P is

(a) 10 N (b) 105 (c) 20 (d) 102


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Answer - 1

(b) 105


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Question - 2

A says that two forces will be inequilibrium only if they are equal inmagnitude and opposite in direction.

B says that concurrent coplanar forcesystem can be obtained by removing oneor more forces from any non-concurrentforce system. Who is right?

(a) Only A (b) Only B

(c) Both A and B(d) Neither A nor B


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Answer - 2

(b) Only B


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Question - 3

The FBD of the Light rod BC shown in figure isgiven by

(b)

(c) (d)

(a)


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Answer - 3

(c)


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Question - 4

A says that a force cannot be resolvedinto three coplanar components acting inthree directions.

B says that if three forces, P, Q, R[P>Q>R] acting at a point are inequilibrium, then P must be less than orequal to (Q+R). Who is correct?

(a) Only A (b) Only B

(c) Both A and B (d) Neither A nor B


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Answer 4

(b) Only B


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Question - 5

In a system of non-concurrent coplanarforces the three equations ofequilibrium can be represented as

(a) X = 0 ; Y = 0 ; M = 0(b) X = 0 ; MA= 0 ; MB = 0 (line AB is

NOT perpendicular to direction X)

(c) MA= 0 ; MB= 0 ; MC = 0 (A,B,C areNOT collinear)

(d) All the above


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Answer 5

(d) All the above


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Question - 6

The moment of a force about any

point is numerically equal to____ times the area of thetriangle whose base is the linerepresenting the force; andvertex is the point about whichmoment is taken.

(a) (b) 1

(c) 2 (d) 3


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Answer 6

(c) 2


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Question - 7

The SFD of a simple supported

symmetrically loaded beam is givenin the figure. The maximum BM willbe ____________KN-m.


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Answer 7

10 KN - m


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Question - 8

The truss shown in the figure is

(a) deficient (b) perfect

(c) redundant(with first degree)(d) redundant - (with second degree)truss


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Answer 8

(b) perfect


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Question - 9

A beam ABCD is loaded such that B.M. atC is equal to zero. The beam is cut atC and then the two parts of the beamare connected by a hinge at C. If thesame load is now applied on the beam,then

(a) SFD will not change

(b) BMD will not change

(c) both SFD & BMD will not change

(d) the beam will collapse under the load


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Answer 9

(c) both SFD & BMD will not change


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Question - 10

The value of maximum bendingmoment in the beam AB shown inthe figure will be _______ KN-m.


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Answer 10

10 KN - m


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Question - 11

Consider the beam AB. The magnitude ofcouple M required to be applied suchthat the shear force and bendingmoment(both)- at point A are zero, willbe ______ KN-m.


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Answer 11

M = 3 KN - m


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Question - 12

The number of zero-force members in the

truss shown in the figure will be

(a) 2 (b) 3

(c) 4 (d) 5.


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Question - 13

The figure shows a rectangular section

ABCD size 2 cm x 4 cm. Out ofmoments of inertia Ix, Iy, IAB, IAD thefollowing will have Least value.

(a) Ix (b) Iy (c) IAB (d) IAD


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Answer - 13

(b) Iy


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Answer - 14

(a) A


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Answer 15

(a) a couple is acting at that section


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Answer 21

(d) F is non-zero but M is zero


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Question 25Match List-I (a, b, c, d) with List-II (1, 2, 3, 4)

List-I(a)Two forces acting on a body, moving with auniform velocity(b) A moving particle(c)Two coplanar parallel forces equal in

magnitude and opposite in direction acting on abody(d) Two unequal forces acting on a body

List-II

(1) Kinetic energy (2) Couple(3) Forces in equilibrium (4) cause acceleration


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Answer26

(b) B


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Answer 29

(c)


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Question - 30

In the beam shown in the Figure, find Reaction at B.


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Answer 31

Couple 120 N m ( counter clockwise )


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Question - 32

Find WRONGstatement out of the following :

(a) Coefficient of friction is the ratio of limitingforce of friction to the weight of the body

(b) Coefficient of friction depends on thematerials of the bodies in contact

(c) Angle of friction is the angle betweennormal reaction and total resultant reaction.

(d) For a body resting on an inclined plane, theangle of repose will be greater than the angle of

inclination of the plane.


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Question 33


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Question - 33

Consider the following statements :

Assertion (A): The resultant of UDL is a single

concentrated load having magnitude equal tothe area under load diagram.

Reason ( R ) : The line of action of theresultant force passes through the centroid of

the area under load diagram.

Select your answer using the codes givenbelow :

(a) both A and R are true and R is the correct explanation

of A.

(b) both A and R are true and R is not correct explanationof A

(c ) A is true but R is false.

Answer 33


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Answer - 33

(b) both A and R are true and R is not correct explanation of

A


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final mechanics quiz ppt 21 1 .11.09

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