171. In order to double the period of simple pendulum, the length of the string should be
halved
doubled
quadrupled
✅ The correct answer is option C.
Engineering Mechanics MCQs
172. When two elastic bodies collide with each other,
the two bodies will momentarily come to rest after collision
the two bodies tend to compress and deform at the surface of contact
the two bodies begin to regain their original shape
all of the above
✅ The correct answer is option D.
173. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
TRUE
FALSE
✅ The correct answer is option A.
174. The wheels of a moving car possess
potential energy only
kinetic energy of translation only
kinetic energy of rotation only
kinetic energy of tran
✅ The correct answer is option D.
175. The terms ‘leverage’ and ‘mechanical advantage’ Of a compound lever have got the same meaning.
Correct
Incorrect
✅ The correct answer is option A.
176. The forces which do not meet at one point and their lines of action do not lie on the same plane are known as
coplaner concurrent forces
coplaner non-concurrent forces
non-coplaner concurrent forces
none of these
✅ The correct answer is option D.
177. The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
α = 45° + φ/2
α = 45° – φ/2
α = 90° + φ
α = 90° – φ
✅ The correct answer is option B.
178. The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.
3r/ 8
4r/ 3π
8r/3
3r/4π
✅ The correct answer is option B.
179. The centre of gravity of a triangle lies at a point where its medians intersect each other.
TRUE
FALSE
✅ The correct answer is option A.
180. The unit of angular velocity is
m/min
rad/s
revolutions/min
both (B) and (C)
✅ The correct answer is option D.