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- Question
A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is
Options- A. justified
- B. not justified
- Correct Answer
- justified
- 1. The velocity ratio of a single purchase crab winch can be increased by
Options- A. increasing the length of the handle
- B. increasing the radius of the load drum
- C. increasing the number of teeth of the pinion
- D. all of the above Discuss
- 2. For any system of coplaner forces, the condition of equilibrium is that the
Options- A. algebraic sum of the horizontal components of all the forces should be zero
- B. algebraic sum of the vertical components of all the forces should be zero
- C. algebraic sum of moments of all the forces about any point should be zero
- D. all of the above Discuss
- 3. A force acting in the opposite direction to the motion of the body is called force of friction.
Options- A. Agree
- B. Disagree Discuss
- 4. Coefficient of friction depends upon
Options- A. area of contact only
- B. nature of surface only
- C. both (a) and (b)
- D. none of these Discuss
- 5. The unit of angular velocity is
Options- A. m/min
- B. rad/s
- C. revolutions/min
- D. both (B) and (C)
- E. none of these Discuss
- 6. The maximum displacement of a body, from its mean position is called amplitude.
Options- A. Correct
- B. Incorrect Discuss
- 7. The moment of inertia of a square of side (a) about an axis through its centre of gravity is
Options- A. a4/4
- B. a4/8
- C. a4/12
- D. a4/36 Discuss
- 8. The ratio of static friction to dynamic friction is always
Options- A. equal to one
- B. less than one
- C. greater than one
- D. none of these Discuss
- 9. A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is(where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)
Options- A. MS/3
- B. MS/4
- C. MS/5
- D. none of these Discuss
- 10. A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act
Options- A. towards the wall at its upper and
- B. away from the wall at its upper end
- C. downward at its upper end
- D. upward at its upper end Discuss
Engineering Mechanics problems
Search Results
Correct Answer: increasing the length of the handle
Correct Answer: all of the above
Correct Answer: Agree
Correct Answer: nature of surface only
Correct Answer: both (B) and (C)
Correct Answer: Correct
Correct Answer: a4/12
Correct Answer: greater than one
Correct Answer: MS/5
Correct Answer: upward at its upper end
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