Engineering Mechanics - Mechanical Engineering online quiz - Set 01 - ObjectiveBooks

# Engineering Mechanics - Mechanical Engineering online quiz - Set 01

## Engineering Mechanics online Quiz - Set 01

1. A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
True
False

2. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
True
False

3. The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.
Correct
Incorrect

4. A Newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m/s2  in the direction of which it acts.
Yes
No

5. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
True
False

6. The triangle law of forces states that if two forces acting simultaneously on a particle, be represented in magnitude and direction by the two sides of a triangle taken in order, then their resultant may be represented in magnitude and direction by the third side of a triangle, taken in opposite order.
True
False

7. The centre of gravity of a right angled triangle lies at its geometrical centre.
Correct
Incorrect

8. If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.
True
False

9. A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is
Not justified
Justified

10. A lifting machine lifts a load of 1000 N through a distance of 0.2 m by means of an effort of 200 N through a distance of 1 m. This machine is an ideal one.
Correct
Incorrect

11. All the steel trusses of the bridges have one of their end roller supported, and other end hinged. The main advantage of such a support is that the truss remains stable.
True
False

12. The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplanar non-concurrent forces.
Disagree
Agree

13. The angle of inclination with the vertical is ________ if the cyclist is running at a faster speed than that when he is running at a slower speed.
More
Less

14. If two blocks of equal mass are attached to the two ends of a light string and one of the blocks is placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley, then the two blocks will have some motion.
Disagree
Agree

15. The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.
Incorrect
Correct

16. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
Disagree
Agree

17. If three forces acting at a point are represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium.
Yes
No

18. If three coplanar forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.
Correct
Incorrect

19. In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.
True
False

20. When a particle moves along a circular path with uniform velocity, there will be no tangential acceleration.
Incorrect
Correct

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