Questions and answers for exam Preparation

MCQs

Total Questions : 1187 | Page 4 of 119 pages

Question 31. Moment of inertia of a circular section about an axis perpendicular to the section is

πd3/16
πd3/32
πd4/32
πd4/64

Discuss Question

Answer: Option C. -> πd4/32

Question 32. A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

Equal to
Less than
Greater than
None of these

Discuss Question

Answer: Option A. -> Equal to

Question 33. A ladder is resting on a smooth ground and leaning against a rough vertical wall. the force of friction will act

Towards the wall at its upper end
Away from the wall at its upper end
Downward at its upper end
Upward at its upper end

Discuss Question

Answer: Option D. -> Upward at its upper end

Question 34. A ladder is resting on a rough ground and leaning against a smooth vertical wall. the force of friction will act

Downward at its upper end
Upward at its upper end
Zero at its upper end
Perpendicular to the wall at its upper end

Discuss Question

Answer: Option C. -> Zero at its upper end

Question 35. The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The algebraic sum of the resolved parts of the forces in the given direction
The sum of the resolved parts of the forces in the given direction
The difference of the forces multiplied by the cosine of θ
The sum of the forces multiplied by the sine of θ

Discuss Question

Answer: Option A. -> The algebraic sum of the resolved parts of the forces in the given direction

Question 36. The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

β/2
30° + β/2
45° + β/2
60° + β/2

Discuss Question

Answer: Option C. -> 45° + β/2

Question 37. The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is

2mr²/3
2mr²/5
7mr²/3
7mr²/5

Discuss Question

Answer: Option D. -> 7mr²/5

Question 38. The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be

20 kg, -ve sense
20 kg, + ve sense
10 kg, + ve sense
10 kg, -ve sense

Discuss Question

Answer: Option A. -> 20 kg, -ve sense

Question 39. According to lami’s theorem

The three forces must be equal
The three forces must be at 120° to each other
The three forces must be in equilibrium
If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Discuss Question

Answer: Option D. -> If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Question 40. According to lami’s theorem

The three forces must be equal
The three forces must be at 120° to each other
The three forces must be in equilibrium
If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Discuss Question

Answer: Option D. -> If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two