APPLIED MECHANICS MCQS SET 05

APPLIED MECHANICS MCQS SET 05

1. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is
A. 50%
B. 40%
C. 55%
D. 30%.
Answer: Option B
2. A string of length 90 cm is fastened to two points A and B at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force P is applied to the ring such that it is in equilibrium vertically below B. The value of P is :
A. 40 g
B. 60 g
C. 80 g
D. 100 g.
Answer: Option C
3. The c.g. of a thin hollow cone of height h, above its base lies on the axis, at a height of
A. h/3   
B. h/4
C. 2h/4
D. 3h/4
Answer: Option C
 

4. Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is
A. 20 kg
B. 25 kg
C. 30 kg
D. 35 kg
E. 40 kg.
Answer: Option B
 

5. The C.G. of a right circular cone lies on its axis of symmetry at a height of
A. h/2
B. h/3
C. h/4
D. h/5
E. h/6.
Answer: Option C
 

6. A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, is
A. 40 kg
B. 60 kg
C. 10 kg
D. 100 kg.
Answer: Option C
 

7. If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is
A. 8°
B. 9°
C. 10°
D. 11°
E. 12°.
Answer: Option C