MEC 107 MCQ 8

Mechanics test paper 6

51)   Which of the following conditions do not change the effect of couple?

a. Shifting of couple to a new position in its plane
b. Shifting of couple to a parallel plane
c. Rotation of couple in its plane
d. All of the above

52)   What are the X and Y components of point P for the force system shown below?

Force-system-for-given-point.png
a. X = 186.00 N, Y = 464 N
b. X = 464.23 N, Y = 185 N 
c. X = 466.12 N, Y = -180 N
d. None of the above

53)   If two concurrent forces A and B acting on a point are 200 N and 300 N. What is the magnitude of resultant force, if it makes an angle of 50o with each force?

a. 471.08 N
b. 455.12 N 
c. 400.56 N
d. Insufficient data

54)   What is the angle made by side of a square lamina, if it is freely suspended from a corner with the horizontal? 

a. 0o
b. 45o 
c. 90o
d. 180o
55)   What is the C.G of an isosceles triangle of base 20 cm and side 40?

a. 12.90 cm 
b. 13.28 cm
c. 19.36 cm
d. 38.72 cm

56)   Uniformly distributed load of 5 kN acts on a simply supported beam of length 10 m. What are the reactions at end points of the beam?

a. 12.5 kN
b. 25 kN 
c. 50 kN
d. None of the above

57)   At zero acceleration a particle moves along a straight line. What is the velocity of a particle at the position of 
x = t4 -20t2 + 42 ?

a. + 48.68 m/sec
b. - 48.68 m/sec 
c. + 42 m/sec
d. - 42 m/sec

58)   What is the length of a train which crosses a bridge of 150 m in 20 sec with a speed of 40 km/h?

a. 222 m
b. 150 m
c. 72.2 m
d. 70.5 m

59)   What is the initial velocity of an object which travels a distance of 10t2+15t + 5 along a straight line in time t?

a. -10
b. +10
c. -15
d. +15 

60)   What are the limitations of string law?

a. Direction of motion cannot be specified 
b. Valid only when more than three particles are connected by a single string
c. Both a. and b.
d. None of the above

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