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SAIL Mechanical enigneering questions and answers
Mechanical Engineering Objective Type Questions Engineering Mechanics
1. The unit of force in S.I. unit is
(a) kilogram
(b) newton (Ans)
(c) watt
(d) dyne
2. The unit of work or energy in S.I. unit is
(a) newton
(b) pascal
(c) kilogram metre
(d) joule (Ans)
3. The unit of power in S.I. unit is
(a) newton metre
(b) watt (Ans)
(c) joule
(d) pascal per sec
4. Forces are called concurrent when their line
(a) one point (Ans)
(b) two point
(c) one plane
(d) different planes
5. A force is completely defined when we specify
(a) magnitude
(b) direction
(c) point of application
(d) all the above (Ans)
6. Which of the following is not the unit of distance ?
(a) angstrom
(b) light year
(c) micron
(d) milestone (Ans)
7. Which of the following is not the unit of power ?
(a) kw (kilo watt)
(b) hp (horse power)
(c) k cal/sec
(d) k cal/kg sec (Ans)
8. Which of the following is not the unit of work, energy and heat ?
(a) k cal
(b) kg m (Ans)
(c) kwhr
(d) hp
9. Which of the following is not the unit of pressure ?
(a) kg/cm2
(b) ata
(c) atmosphere
(d) newton (Ans)
10. When trying to turn a key into lock, following is applied
(a) coplanar force
(b) non-coplanar force
(c) lever
(d) couple (Ans)
11. Which of the following is not a scalar quantity ?
(a) time
(b) mass
(c) volume
(d) acceleration
12. Which of the following is a vector quantities ?
(a) energy
(b) mass
(c) momentum (Ans)
(d) speed
13. Which of the following is not vector quantities ?
(a) weight (Ans)
(b) velocity
(c) force
(d) moment
14. The unit of moment of inertia of an area are
(a) kg m2
(b) m4 (Ans)
(c) kg/m2
(d) m3
15. The unit of moment of inertia of mass are
(a) kg m2 (Ans)
(b) m4
(c) kg/m2
(d) m3
16. Which of the following is not the unit of energy ?
(a) kgm
(b) watt (Ans)
(c) K cal
(d) kgm x (m/sec2)
17. Which of the following is the example of lever of first order ?
(a) arm of man
(b) pair of scissors
(c) pair of the clinical tongs
(d) all of the above (Ans)
18. A pair of Smith's Tong's is an example of the lever of
(a) zeroth order
(b) first order
(c) second order (Ans)
(d) third order
19. Tension in a string is maximum at
(a) left support
(b) right support
(c) midway (Ans)
(d) quarter span
20. Which of the following is the unit of energy ?
(a) joules
(b) N-m
(c) electron-volt
(d) all the above (Ans)
21. The product of mass and velocity is known as
(a) work
(b) moment
(c) impulse
(d) momentum (Ans)
22. For a m/c to be self locking its efficiency should be
(a) 100%
(b) >67%
(c) >50% (Ans)
(d) more than 50%
23. A jet engine works on the principle of conservation
(a) energy
(b) mass
(c) linear momentum (Ans)
(d) angular momentum
24. Work is equal to
(a) force x velocity
(b) force x time
(c) force x distance (Ans)
(d) mass x acceleration
25. One N is equal to
(a) 107 dyne (Ans)
(b) 106 dyne
(c) 104 dyne
(d) 103 dyne
26. Rate of change of momentum is proportional to the
(a) displacement
(b) velocity
(c) acceleration (Ans)
(d) impressed force
27. The unit of momentum are same as of
(a) work
(b) energy
(c) force
(d) impluse (Ans)
