MEC 107 MCQ 2

Mechanic practice set  paper 2

11)   A boat sails across a river with a velocity of 10 km/hr. If resultant boat velocity is 14 km/hr, then what is the velocity of river water? 

a. 17.20 km/hr
b. 10 km/hr
c. 9.79 km/hr 
d. 4.88 km/hr

12)   According to which law, every action has an equal and opposite reaction?

a. Newton's first law
b. Newton's second law
c. Newton's third law 
d. None of the above

13)   A body exerts a force of 800 N on the floor of the lift which moves upwards with a retardation of 2 m/s2. What is mass of the body carried in the lift? 

a. 74.02 N
b. 81.54 N
c. 102.43 N 
d. None of the above

14)   A man of 60 kg moves in a lift of constant velocity 5 m/s. What is the reactive force acting on the man by the elevator?

a. 888 N
b. 588 N 
c. 288 N
d. Zero

15)   When motion is _______, the normal component of acceleration is zero.

a. curvilinear
b. rotational
c. rectilinear 
d. translation

16)   In curvilinear motion, what is the normal component of acceleration? 

a. a2 / t
b. v2 / ρ
c. ρ / v
d. dv / dt

17)   What are the rectangular components of velocities in curvilinear motion?

a. dx/dt and dy/dt 
b. dr/dt and d2r/dt
c. d2x/dt2 and d2y/dt2
d. none of the above

18)   Assume that same ball is thrown at two angles 50o and 80o from the ground with initial velocity of 12 m/s. 
(1) At which angle ball covers the maximum distance? 
(2) What is the maximum distance covered by the ball?

Projectile-motion.png
a. 50o, 14.45 m 
b. 50o, 11.24 m
c. 80o, 50.33 m
d. 80o, 16.26 m

19)   In projectile motion, which of the following factors affecting the actual path of motion are neglected?

a. Curvature of earth
b. Rotation of earth
c. Wind resistance
d. All of the above

20)   Which of the following formulae is used determine the time of flight for projectile motion, when point of projection and point of landing are on same level of horizontal plane?

a. (2u sin α) / g 
b. (u2 sin α) / 2g
c. (2u sin α) / g cos θ
d. 2ug sin α

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