MEC 107 MCQ 3

Mechanics Pratice paper 3

 21)   Which axial force is determined while analyzing a truss? 


a. compressive force
b. tensile force
c. both a. and b.
d. none of the above
ANSWER: both a. and b.

22)   If a body is subjected to plastic impact, _______

a. only kinetic energy is conserved
b. only momentum is conserved
c. both a. and b.
d. none of the above

23)   An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force?


a. 2 m/s
b. 4.6 m/s
c. 7.33 m/s
d. 9.33 m/s
ANSWER: 7.33 m/s

24)   If two objects of 30 kg and 10 kg move with equal kinetic energy, then what is the ratio of magnitudes for linear momentum? 


a. √3 : 1
b. 1 : √3
c. 1 : 3√3
d. 1 : 3
ANSWER: √3 : 1

25)   The total momentum of a system __________, if no external impressed force acts on it.


a. increases
b. decreases
c. remains constant
d. none of the above
ANSWER: remains constant

26)   According to the principle of conservation of energy, under the action of _________ force, the sum of P.E and K.E of a particle remains constant.


a. conservative force
b. dissipative force
c. frictional force
d. air resistance force
ANSWER: conservative force

27)   Work done by an engine in 6 sec is 1000 joules. What is the power generated by the engine in watt? 


a. 1600 watt
b. 600 watt
c. 166 watt
d. 600 watt
ANSWER: 166 watt

28)   If a particle of mass 5 kg moves uniformly along a circle of radius 10 m at 10 m/s, then what is the work done by centripetal force during its one revolution?

a. 0.5 kNm
b. zero
c. infinity
d. none of the above
ANSWER: zero

29)   A block is displaced by 3 m when a force of 200 N is applied on it on an inclined surface which is at an angle of 50o with the horizontal. What is the work done? 

a. 385.67 Nm
b. 459.62 Nm
c. 933.00 Nm
d. Insufficient data
ANSWER: 385.67 Nm

30)   What is the momentum of a body of 2 kg at its highest point, when thrown with a velocity of 15 m/s at an angle of of 70o with the horizontal?

a. 9.23 kg ms-1
b. 10.26 kg ms-1
c. 28.19 kg ms-1
d. None of the above
ANSWER: 10.26 kg ms-1


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