Engineering Mechanics online Practice Test - Set 08 - ObjectiveBooks

# Practice Test: Question Set - 08

1. The motion of a particle round a fixed axis is
(A) Translatory
(B) Rotary
(C) Circular
(D) Translatory as well as rotary

2. The C.G. of a right circular solid cone of height h lies at the following distance from the base
(A) h/2
(B) J/3
(C) h/6
(D) h/4

3. Which of the following statement is correct?
(A) The kinetic energy of a body during impact remains constant
(B) The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact
(C) The kinetic energy of a body before impact is less than the kinetic energy of a body after impact
(D) The kinetic energy of a body before impact is more than the kinetic energy of a body after impact

4. A pair of smith's tongs is an example of the lever of
(A) Zeroth order
(B) First order
(C) Second order
(D) Third order

5. Moment of inertia of a circular section about its diameter (d) is
(A) πd3/16
(B) πd3/32
(C) πd4/32
(D) πd4/64

6. The forces, which meet at one point, but their lines of action do not lie in a plane, are called
(A) Coplanar non-concurrent forces
(B) Non-coplanar concurrent forces
(C) Non-coplanar non-concurrent forces
(D) Intersecting forces

7. The resultant of two forces P and Q acting at an angle θ is
(A) √(P² ++ 2PQ sinθ)
(B) √(P² ++ 2PQ cosθ)
(C) √(P² + Q² - 2PQ cosθ)
(D) √(P² +- 2PQ tanθ)

8. Center of percussion is
(A) The point of C.G.
(B) The point of metacenter
(C) The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
(D) Point of suspension

9. The static friction
(A) Bears a constant ratio to the normal reaction between the two surfaces
(B) Is independent of the area of contact, between the two surfaces
(C) Always acts in a direction, opposite to that in which the body tends to move
(D) All of the above

10. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
(A) Along the plane
(B) Horizontally
(C) Vertically
(D) At an angle equal to the angle of friction to the inclined plane

11. The law of motion involved in the recoil of gun is
(A) Newton's first law of motion
(B) Newton's second law of motion
(C) Newton's third law of motion
(D) None of these

12. A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The center of gravity of the section will lie

(B) In the hole
(C) At ‘O’
(D) None of these

13. A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will
(A) Remain horizontal
(B) Slant up towards direction of pull
(C) Slant down towards direction of pull
(D) None of the above

14. Which of the following statement is correct?
(A) The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation
(B) The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity
(C) The velocity of the particle moving with simple harmonic motion is zero at the mean position
(D) The acceleration of the particle moving with simple harmonic motion is maximum at the mean position

15. In ideal machines
(A) Mechanical advantage is greater than velocity ratio
(B) Mechanical advantage is equal to velocity ratio
(C) Mechanical advantage is less than velocity ratio