221. The centre of gravity of a right angled triangle lies at its geometrical centre.
Correct
Incorrect
✅ The correct answer is option B.
Engineering Mechanics MCQs
222. The maximum efficiency of a lifting machine is
1/m
V.R./m
m/V.R.
1/(m x V.R.)
✅ The correct answer is option D.
223. In ideal machines, mechanical advantage is __________ velocity ratio.
equal to
less than
greater than
✅ The correct answer is option A.
224. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
n
n2
2n
2n – 1
✅ The correct answer is option C.
225. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
directly
inversely
✅ The correct answer is option A.
226. The length of a second’s pendulum is
94.9cm
99.4cm
100cm
101cm
✅ The correct answer is option B.
227. In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.
half
equal to
double
✅ The correct answer is option A.
228. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by
P + Q
P – Q
P / Q
Q / P
✅ The correct answer is option B.
229. A framed structure is imperfect, if the number of members are __________ (2j – 3).
equal to
less than
greater than
either (b) or (c)
✅ The correct answer is option D.
230. A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.
Yes
No
✅ The correct answer is option B.