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paper of engineering mechanics engineering mechanics objective questions damare

# Course=engineering mechanics Subject=engineering mechanics objective questions

## Question no-1The unit of Moment of Inertia of a body, is

(a)                  m

(b)                  m4

(c)                  m2

(d)                  m3

(e)                  m5

(f)                  none of these

Sollution

(b)                  m4

## Question no-2A 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

(a)                  6t + 2

(b)                  3t3 - 2t

(c)                  3t3 + 2t

(d)                  6t - 2

(e)                  NONE OF THESE

Sollution

(a)                  6t + 2

## Question no-3The Law of Polygon of Forces states that

(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

## Question no-4Parallelogram 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

(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"

## Question no-5Which one of the following statements is true ?

(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

## Question no-6The product of mass and velocity of a moving a body, is called

(a)                  moment

(b)                  momentum

(c)                  power

(d)                  impulse

(e)                  both a & b

Sollution

(b)                  momentum

## Question no-7The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called

(a)                  angle of repose

(b)                  angle of friction

(c)                  angle of inclination

(d)                  none of these

Sollution

(a)                  angle of repose

## Question no-8The tension in a cable supporting a lift

(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

## Question no-9A satellite moves in its orbit around the earth due to

(a)                  Gravitational force

(b)                  Centripetal force

(c)                  Centrifugal force

(d)                  none of these

(e)                  all the above.

Sollution

(b)                  Centripetal force

## Question no-10The resultant of two forces P and Q acting at an angle θ, is

(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

## Question no-11The reaction at the support A of the beam shown in below figure is (a)                  2 t

(b)                  t

(c)                  3t

(d)                  4t

(e)                  5t

(f)                  none of these

Sollution

(a)                  2 t

## Question no-12Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

(a)                  55 Newtons

(b)                  15 Newtons

(c)                  10Newtons

(d)                  12Newtons

(e)                  13Newtons

(f)                  14Newtons

Sollution

(c)                  10Newtons

## Question no-13The resultant of the forces acting on a body will be zero if the body

(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

## Question no-14A Seconds pendulum executes

(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

## Question no-15The unit of force in C.G.S. system of units, is called

(a)                  dyne

(b)                  Newton

(c)                  kg

(d)                  all the above.

Sollution

(a)                  dyne

## Question no-16the force which produces an acceleration of 1 m/sec2 in a mass of one kg, is called

(a)                  dyne

(b)                  Netwon

(c)                  joule

(d)                  erg

Sollution

(b)                  Netwon

## Question no-17The centre of gravity of a homogenous body is the point at which the whole

(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 