Top 350+ Solved Applied Mechanics MCQ Questions Answer
Q. A number of forces acting at a point will be in equilibrium if
a. Sum of the forces is zero
b. Algebraic sum of the forces is zero
c. Sum of the resolved parts in any two perpendicular directions are both zero
d. None of the above
e. The metacentre of the body
Q. The springs A and B are identical except that A is stiffer than B, that is KA > kB. If both the springs are stretched by the same amount
a. more work will be expended on A than B
c. same work will be expended in both springs.
d. less work will be expended on A than B
e. 107 dynes
Q. A rigid body is suspended vertically at a point and oscillates with a small amplitude under the action of the force of gravity. Such an arrangement is called
a. Simple pendulum
b. Rigid pendulum
c. Second's pendulum
d. Compound pendulum
e. Newton's pendulum
Q. A block slides down a frictionless incline making an angle ? with an elevator floor. The acceleration relative to the incline will be maximum when
a. the elevator ascends at constant speed v
b. the elevator descends at constant speed v
c. 107 dynes
d. elevator descends with deceleration a
e. the elevator descends with acceleration a
Q. A single purchase crab has a handle 45 cm long and a drum of 25 cm diameter. The pinion has 30 teeth and spur has 150 teeth. The efficiency of the machine is 75%. If the maximum force that can be applied is 500 newtons, the maximum load that can be lifted will be
a. 9860 N
b. 6750 N
c. 20250 N
d. 1250 N
e. 13500 N
Q. A body in Simple Harmonic Motion will attain maximum velocity when it passes through
a. Point of 0.75 amplitude
b. Extreme point of the oscillation of L.H.S.
c. Point of half amplitude
d. Extreme point of the oscillation at R.H.S.
e. Mean position
Q. A 5 m ladder of mass 25 kg is placed in a position where its inclination to a vertical wall is at 30?. A 100 kg man is to climb the ladder. If the coefficient of static friction is 0.25 the height along ladder at which the slipping will be induced would be
a. 2.4 m
b. 1.6 m
c. 0.8 m
d. 1.2 m
e. 0.5 m
Q. Which one of the following is not the law of dry friction?
a. If friction is neglected, the reactions are always normal to the surfaces on contact
b. Friction always acts to oppose the relative motion of the free body
c. If static friction is acting, the value of the friction force may vary from zero to its maximum value
d. The force of friction is always normal to the surface
e. All of the above
Q. The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as
a. Corollary to Newton's laws of motion
b. Principle of dynamics
c. D' Alembert's principle
d. Nowton's law
e. Mohr's principle
Q. The moment of a force
a. Occurs about a point
b. Measures the capacity to do useful work
c. Occurs only when bodies are in motion
d. Measures the ability to produce turning or twisting about an axes
e. None of the above
Q. In a slider crank mechanism, the crank is rotating at 200 rpm. If length of connecting rod is 8 mts and crank shaft is 2 mts, velocity of crosshead at 30? rotation of crank shaft equals.
a. 30.2 m/s
b. 33.2 m/s
c. 35.8 mts/s
d. 107 dynes
e. 25.5 m/s
Q. If the angle of friction is zero a body will experience
a. Infinite friction
b. Zero friction
c. The force of friction will act normal to the plane
d. The force of friction will act in the direction of motion
e. None of the above