500 Best Applied Mechanics MCQ
Q81). Two shots fired simultaneously from the top and bottom of a vertical tower with elevations of 30° and 45° respectively strike a target simultaneously. If horizontal distance of the target from the tower is 1000 m, the height of the tower is
a).350 m
b).375 m
c).400 m
d).425 m
Correct Answer:
425 m
Explanation:
Q82). A stone of mass 1 kg is tied to a string of length 1 m and whirled in a horizontal circle at a constant angular speed 5 rad/sec. The tension in the string is,
a).5 N
b).10 N
c).15 N
d).25 N
Correct Answer:
25 N
Explanation:
Q83). The ratio of the moment of inertia of a rectangle about its centroidal axis to the moment of inertia about its base, is
a). 1/4
b). 1/2
c). 3/4
d).2
Correct Answer:
1/4
Explanation:
Q84). The apparent weight of a man in a moving lift is less than his real weight when it is going down with
a).uniform speed
b).an acceleration
c).linear momentum
d).retardation.
Correct Answer:
an acceleration
Explanation:
Q85). is the force acting on a body whose mass is and acceleration is f. The equation P-mf = 0, is known as
a).equation of dynamics
b).equation of dynamic equilibrium
c).equation of statics
d).none of these.
Correct Answer:
equation of dynamics
Explanation:
Q86). Newtons’s Law of Motion is :
a).Every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
b).The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
c).To every action, there is always an equal and opposite reaction
d).All the above.
Correct Answer:
All the above.
Explanation:
Q87). The equation of motion of a particle starting from rest along a straight line is x = (t)^3- 3(t)^2 + 5. The ratio of the velocities after 5 sec and 3 sec will be
a).2
b).3
c).4
d).5
Correct Answer:
5
Explanation:
Q88). The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis, is
a).437.5 cm^4
b).337.5 cm^4
c).237.5 cm^4
d).137.5 cm^4
Correct Answer:
137.5 cm^4
Explanation: