Engineering Mechanics practice exam - Set 13 - ObjectiveBooks

# Practice Test: Question Set - 13

1. The time of flight (t) of a projectile on a horizontal plane is given by
(A) t = 2u. sinÎ±/g
(B) t = 2u. cosÎ±/g
(C) t = 2u. tanÎ±/g
(D) t = 2u/g.sinÎ±

2. Which of the following is not the unit of distance?
(A) Angstrom
(B) Light year
(C) Micron
(D) Milestone

3. Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are
(A) 15 N and 5 N
(B) 20 N and 5 N
(C) 15 N and 15 N
(D) None of these

4. Which of the following are vector quantities?
(A) Linear displacement
(B) Linear velocity
(C) Linear acceleration
(D) All of these

5. Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then
(A) Their algebraic sum is zero
(B) Their lines of action are at equal distances
(C) The algebraic sum of their moments about any point in their plane is zero
(D) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

(A) Compression or tension
(B) Buckling or shear
(C) Shear or tension
(D) All of the above

7. The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

8. Efficiency of a screw jack is given by (where Î± = Helix angle, and Ï† = Angle of friction.)
(A) tan(Î± + Ï†)/tanÎ±
(B) tanÎ±/tan (Î± + Ï†)
(C) tan(Î± - Ï†)/tanÎ±
(D) None of these

9. The force induced in the string AB due to the load W, as shown in the below figure is

(A) W sinÎ¸
(B) W cosÎ¸
(C) W secÎ¸
(D) W cosecÎ¸

10. The unit of work or energy in S.I. units is
(A) Newton
(B) Pascal
(C) Watt
(D) Joule

11. The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)
(A) n
(B)
(C) 2n
(D) 2n - 1

12. If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

13. Center of gravity of a thin hollow cone lies on the axis at a height of
(A) One-fourth of the total height above base
(B) One-third of the total height above base
(C) One-half of the total height above base
(D) Three-eighth of the total height above the base

14. Which of the following statement is correct in connection with projectiles?
(A) A path, traced by a projectile in the space, is known as trajectory.
(B) The velocity, with which a projectile is projected, is known as the velocity of projection.
(C) The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.
(D) All of the above

15. A pendulum which executes one beat per second is known as
(A) Simple pendulum
(B) Compound pendulum
(C) Torsional pendulum
(D) Second's pendulum

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