Course=engineering mechanics

Subject=engineering mechanics objective questions

The unit of Moment of Inertia of a body, is

Optional Answers

(a) m

(b) m4

(c) m2

(d) m3

(e) m5

(f) none of these

Sollution

(b) m4

A particle moves along a straight line such that distance x traversed in t seconds is given by x = t2(t + 1), the acceleration of the particle, will be

Optional Answers

(a) 6t + 2

(b) 3t3 - 2t

(c) 3t3 + 2t

(d) 6t - 2

(e) NONE OF THESE

Sollution

(a) 6t + 2

The Law of Polygon of Forces states that

Optional Answers

(a) if a polygen representing the forces acting at point in a body is closed, the forces are in equilibrium

(b) if forces acting on a point can be represented in magnitde and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by the closing side of the polygon

(c) if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

(d) if forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium.

(e) all the above.

Sollution

(c) if forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side of the polygon, taken in opposite order

Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

Optional Answers

(a) its longer side"

(b) its shorter side"

(c) the diagonal of the parallelogram which does not pass through the point of intersection of the forces

(d) the diagonal of the parallelogram which passes through the point of intersection of the forces"

(e) half the sum of the diagonals".

(f) none of these

Sollution

(d) the diagonal of the parallelogram which passes through the point of intersection of the forces"

Which one of the following statements is true ?

Optional Answers

(a) The tangent of the angle of friction is equal to coefficeint 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) All the above

Sollution

(d) All the above

The product of mass and velocity of a moving a body, is called

Optional Answers

(a) moment

(b) momentum

(c) power

(d) impulse

(e) both a & b

Sollution

(b) momentum

The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called

Optional Answers

(a) angle of repose

(b) angle of friction

(c) angle of inclination

(d) none of these

Sollution

(a) angle of repose

The tension in a cable supporting a lift

Optional Answers

(a) is more when the lift is moving downwards

(b) is less when the lift is moving upwards

(c) remains constant whether its moves downwards or upwards

(d) is less when the lift is moving downwards

(e) none of these

Sollution

(d) is less when the lift is moving downwards

A satellite moves in its orbit around the earth due to

Optional Answers

(a) Gravitational force

(b) Centripetal force

(c) Centrifugal force

(d) none of these

(e) all the above.

Sollution

(b) Centripetal force

The resultant of two forces P and Q acting at an angle θ, is

Optional Answers

(a) P2 + Q2 + 2P sin θ

(b) P2 + Q2 + 2PQ cos θ

(c) P2 + Q2 + 2PQ tan θ

(d) none of these

Sollution

(d) none of these

The reaction at the support A of the beam shown in below figure is

Optional Answers

(a) 2 t

(b) t

(c) 3t

(d) 4t

(e) 5t

(f) none of these

Sollution

(a) 2 t

Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

Optional Answers

(a) 55 Newtons

(b) 15 Newtons

(c) 10Newtons

(d) 12Newtons

(e) 13Newtons

(f) 14Newtons

Sollution

(c) 10Newtons

The resultant of the forces acting on a body will be zero if the body

Optional Answers

(a) rotates

(b) moves with variable velocity in a straight line

(c) moves along a curved path

(d) does not move at all

(e) NONE OF THESE

Sollution

(d) does not move at all

A Seconds pendulum executes

Optional Answers

(a) 0.25 beat per second

(b) 0.5 beat per second

(c) 1 beat per second

(d) 2 beat per second

(e) none of these

Sollution

(d) 2 beat per second

The unit of force in C.G.S. system of units, is called

Optional Answers

(a) dyne

(b) Newton

(c) kg

(d) all the above.

Sollution

(a) dyne

the force which produces an acceleration of 1 m/sec2 in a mass of one kg, is called

Optional Answers

(a) dyne

(b) Netwon

(c) joule

(d) erg

Sollution

(b) Netwon

The centre of gravity of a homogenous body is the point at which the whole

Optional Answers

(a) volume of the body is assumed to be concentrated

(b) area of the surface of the body is assumed to be concentrated

(c) weight of the body is assumed to be concentrated

(d) all the above

Sollution

(c) weight of the body is assumed to be concentrated

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