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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 12
Q1 | The ratio of moment of inertia of a circular body about x axis to that about y axis is
- ?
- ?
- 1?4
- 1
Q2 | A compressure force in boom in above problem is
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- 1096 kg
- 886 kg
- 693 kg
- 1390 kg
Q3 | A body having SHM has period of 6 sec and amplitude of 4 mts. Maximum velocity is
- ?/3 m/s
- 2?/3 m/s
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- 3? m/s
- 4?/3 m/s
Q4 | What is the maximum force, in Newtons, that will not cause tension?
- 294
- 316
- 346
- 184
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Q5 | Centroid of the are of circle shown in adjacement figure is
- r sin (?/2)/2 ?, 0
- r sin (?)/?, 0
- 2 r sin (?/2)/?, 0
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- 2r sin (?)/?, 0
Q6 | The centroid of the area between the circle x2 + y2 = 16 and the line x + y = 4 will have the coordinates
- (4, 2)
- (2, 4)
- (2.34, 2.34)
- (1.16, 1.16)
- None of the above
Q7 | Polar moment of inertia is
- Applicable to masses whereas moment of inertia is applicable to area only
- The moment of inertia for an area ralative to a line or axis which is out the plane of area
- Same as moment of inertia
- The moment of inertia for an area relative to a line or axis parallel to the centroidal axis
- The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area
Q8 | A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of
- 56,900 ft
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- 75,000 ft
- 48.300 ft
- 65,800 ft
Q9 | In the impact problems the following conditions must always be satisfied
- The total kinetic energy remains unchanged
- The total linear momentum remains unchanged
- The magnitude of the total linear momentum is multiplied by the coefficient of restitution
- The kinetic energy of the system is reduced by a factor proportional to the coefficient of restitution
- None of the above
Q10 | A hammer gains 50 Ns momentum in 0.05 sec. The average force on the hammer will be
- 500 N
- 2000 N
- 1500 N
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- 1000 N
Q11 | If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover
- air resistance
- track resistance
- frictional resistance
- flange resistance
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Q12 | A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he
- extends his arms outwards
- moves towards the axis of rotation
- jumps out from the platform
- accepts a heavy bag from one of his friends standing near by and holds it in his hand
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Q13 | A stone weighing 20 N is whirling in a vertical circle at the extremity of a string 100 cm long. The tension in the string will be zero
- at the highest position
- at the lowest position
- at the midway position
- at none of the above
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Q14 | During planetary motion which of the following remains constant?
- Augular speed
- Linear velocity
- Angular acceleration
- Total angular momentum
- All of the above
Q15 | According to principle of transmissiblity of forces, when a force acts upon a body, its effect is
- maximum when it acts at C.G. of the body
- minimum when it acts at C.G. of the body
- different at different points of the body
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- same at every point in its line of action
Q16 | The statement --- if forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order then their resultant will be represented in magnitude and direction by the closing side of the polygon taken in opposite order ---- is known as
- Law of triangle of forces
- Newton's law of forces
- Law of polygon of forces
- D'Alembert's rule
- Lami's theorem
Q17 | A ball A of mass 0.25 kg moving on a smooth horizontal table with a velocity of 10 m/s strikes an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after the impact will be
- 2.5 m/s
- zero
- 5 m/s
- 10 m/s
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Q18 | The slope on the road generally provided on the curves is known as
- Angle of repose
- Angle of friction
- Angle of banking
- Angle of reaction
- None of the above
Q19 | An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected.
- 8230 lb
- 6170 lb
- 2800 ib
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- 3280 lb
Q20 | A block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height
- block A will have higher velocity than block B while hitting the ground
- block B will hit the ground earlier.
- both will hit the ground simultaneously
- block A will hit the ground earlier
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Q21 | A projectile is shot straight up with vo = 40 m/s. After how many seconds will it return if drag is neglected?
- 6
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- 4
- 10
- 8
Q22 | The necessary condition for the forces acting on a body to be in equilibrium is that these should be
- In the same direction
- Coplaner
- Similar in nature
- Should not meet at a point
- (B) and (D) above
Q23 | A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be
- 2 km
- 20 km
- 36 km
- 10 km
- 80 km
Q24 | What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post (
- 0.35
- 0.8
- 1.46
- 2.85
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Q25 | At a roller support the line of reaction and the roller base must be at an angle of
- 60?
- 90?
- not less than 60?
- not more than 60?
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