500 Best Applied Mechanics MCQ
Q49). For maximum range of a projectile, the angle of projection should be
a).30°
b).45°
c).60°
d).none of these.
Correct Answer:
45°
Explanation:
Q50). A particle moves with a velocity of 2 m/sec in a straight line with a negative acceleration of 0.1 m/sec. Time required to traverse a distance of 1.5 m, is
a).40 sec
b).30 sec
c).20 sec
d).15 sec
Correct Answer:
20 sec
Explanation:
Q51). According to Law of Triangle of Forces
a).three forces acting at a point, can be rep-resented by the sides of a triangle, each side being in proportion to the force
b).three forces acting along the sides of a triangle are always in equilibrium
c).if three forces acting on a, point can be represented.in magnitude and direction, by the sides of a triangle taken in order, these will be in equilibrium
d).if the forces acting on a particle be represented in magnitude and direction by the two sides of a triangle taken in order, their resultant will be represented in magnitude and direction by the third side of the triangle, taken in opposite order.
Correct Answer:
0
Explanation:
Q52). A Second’s pendulum gains 2 minutes a day. To make it to keep correct time its length
a).must be decreased
b).must be increased
c).is not changed but weight of the bob is increased
d).is not changed but weight of the bob is decreased
Correct Answer:
must be increased
Explanation:
Q53). The following is not a law of static friction :
a).The force of friction always acts in a direction opposite to that in which the body tends to move
b).The force of friction is dependent upon the area of contact
c).The force of friction depends upon the roughness of the surface
d).The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces.
Correct Answer:
The force of friction always acts in a direction opposite to that in which the body tends to move
Explanation:
Q54). The velocity of a moving body, is
a).a vector quantity
b).a scalar quantity
c).a scalar as well as a vector quantity
d).none of these.
Correct Answer:
a vector quantity
Explanation:
Q55). A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be
a).48 kg
b).60 kg
c).72 kg
d).none of these.
Correct Answer:
48 kg
Explanation:
Q56). The resolved part of the resultant of two forces inclined at an angle θ in a given direction is
a).algebraic sum of the resolved parts of the forces in the direction
b).arithmetical sum of the resolved parts of the forces in the direction
c).difference of the forces multiplied by cosine θ°
d).sum of the forces multiplied by the sine θ
Correct Answer:
algebraic sum of the resolved parts of the forces in the direction
Explanation: