# Applied Mechanics (11-20)

11.  The direction of projection for the range of a projectile to be maximum on an inclined plane having angle of inclination 30? to the horizontal, whould be
 A. 30? with horizontal B. 30? with vertical C. 45? with horizontal D. 45? with inclined plane E. 60? with inclined plane

Explanation:

12.  A man wished to move a block of size 3 m x 3 m weighing 80 kg. The coefficient of friction between the block and the ground is 0.27. Which of the following methods should be used?
 A. Slide along the ground by pushing B. Pull it C. Lift it bodily D. Tip it over E. Ask for cranes

Explanation:

13.  For perfectly elastic bodies, the value of the coefficient of restitution is
 A. Zero B. 0.372 C. 0.5 D. 1 E. Any value between 0 and 1

Explanation:

14.  A wound watch spring possesses energy in the form of
 A. Potential energy B. Kinetic energy C. Spring energy D. Mechanical potential energy E. Both potential and kinetic energy

Explanation:

15.  A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be
 A. 1 sec B. 2 sec C. 3 sec D. 4 sec E. 5 sec

Explanation:

16.  In above case the maximum height attained by the ball would be
 A. 100 cm B. 49 cm C. 490 cm D. 980 cm E. 1960 cm

Explanation:

17.  A body whose true weight is 14 kg appears to weigh 15 kg when weighed with the help of a spring balance in a moving lift. The acceleration of the lift at the time was
 A. 1.4 m/sec2 B. 1 m/sec2 C. 0.7 m/sec2 D. 0.5 m/sec2 E. 0.35 m/sec2

Explanation:

18.  A particle in simple Harmonic Motion while passing through mean position will have
 A. Maximum kinetic energy and maximum B. Maximum kinetic energy and minimum potential energy C. Minimum kinetic energy and maximum potential energy D. Minimum kinetic energy and minimum potential energy E. Average kinetic energy and average potential energy

Explanation:

19.  A jet engine works on the principle of
 A. Conservation of energy B. Conservation of linear mementum C. Conservation of mass D. Conservation of mass and momentum E. Conservation of energy and momentum

Explanation:

20.  The periodic time of a body moving in Simple Harmonic Motion is
 A. Directly proportional to its angular velocity B. Directly proportional to the weight of the body C. Directly proportional to the momentum of swinging body D. Inversely proportional to the angular velocity E. Inversely proportional to the square of angular velocity