Mechanical Engineering Objective Questions { Engineering Mechanics }

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400. According to Newton's first law of motion,

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. none of the above

401. The moment of inertia of a square of side (a) about an axis through its centre of gravity is

402. The velocity ratio of a single purchase crab winch can be increased by

A. increasing the length of the handle

B. increasing the radius of the load drum

C. increasing the number of teeth of the pinion

D. all of the above

403. The motion of a wheel of a car is

A. purely translation

B. purely rotational

C. combined translation and rotational

D. none of these

404. Non-coplaner non-concurrent forces are those forces which

A. meet at one point, but their lines of action do not lie on the same plane

B. do not meet at one point and their lines of action do not lie on the same plane

C. do not meet at one point but their lines of action lie on the same plane

D. none of the above

405. A force while acting on a body may

A. change its motion

B. balance the forces, already acting on it

C. give rise to the internal stresses in it

D. all of these

406. A screw jack used for lifting the loads is

A. a reversible machine

B. a non-reversible machine

C. an ideal machine

D. none of these

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