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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 2
Q1 | In actual machines
- Mechanical advantage is unity
- Mechanical advantage is greater than velocity ratio
- Mechanical advantage is less than velocity ratio
- Mechanical advantage is less than unity
- Mechanical advantage is equal to velocity ratio
Q2 | The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be
- 137.5 cm4
- 107 dynes
- 275 cm4
- 550 cm4
- 1100 cm4
Q3 | Which of the following is not a unit of energy?
- Joule
- kW
- N-m
- Electron volt
- Watt-hour
Q4 | If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm
- the angular velocity will remain constant
- the angular momentum will increase
- the angular velocity will decrease
- his moment of inertia will decrease
- 107 dynes
Q5 | The y-coordinate of the centroid of the area bounded by the x-axis, the line x = 3 and the parabola y = x2 will be
- 2.7
- 2.55
- 107 dynes
- 2.6
- 2.65
Q6 | Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is
- 5000 J
- 2500 J
- 509.68 J
- None of the above
- Tapered bearing
Q7 | A stone is thrown up from the foot of tower 50 m high with a velocity of 25 m/sec and at the same time another stone is dropped from the top of tower, the two stones will cross each other after
- 3 sec
- 5 sec
- 4 sec
- 4.5 sec
- 2 sec
Q8 | The moment of a force is
- Equivalent to the algebraic sum of the moments acting on a body
- Equivalent to the sum of horizontal as well as vertical components of the moments on a body
- Equivalent to the sum of the moments acting on a body
- Equivalent to the sum of horizontal components of the moments on a body
- Equivalent to the vertical sum of the moments acting on a body
Q9 | Which of the following statement is false?
- The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant)
- The linear velocity of bodies near the earth's equator (due to rotation of earth) is more than the velocities of particles at the pole
- 107 dynes
- A cyclist should move along a zig-zag path while ascending a steep hill
- The density of milk decreases when cream is taken out of milk
Q10 | A gun fires shell with a muzzle velocity of 600 m/sec. The angle of inclination of the gun so that the shell hits a target at a distance of 32 km at level 100 m higher than the gun would be approximately?
- 60?
- 45?
- 30?
- 15?
- Either of (A) and (C)
Q11 | A crate weighing 40 kg rests on a cart moving with an acceleration W. The coefficient of friction between the cart and the crate is
- 2.45 m/sec2
- 4.00 m/sec2
- 0.25 m/sec2
- 4.16 m/sec2
- 1.25 m/sec2
Q12 | A flywheel 200 cm in diameter is rotating at 100 rpm. A point one the rim of the flywheel will not have
- angular velocity
- centripetal acceleration
- tangential acceleration
- all of the above
- 107 dynes
Q13 | A man wished to move a block of size 3 m x 3 m weighing 80 kg. The coefficient of friction between the block and the ground is 0.27. Which of the following methods should be used?
- Slide along the ground by pushing
- Ask for cranes
- Pull it
- Tip it over
- Lift it bodily
Q14 | The centroid of a triangle is at the inter-section of
- perpendicular bisectors
- 107 dynes
- base and perpendicular from opposite vertex
- perpendiculars down from the corners
- medians
Q15 | If there are 3 pulleys in the first system, then the velocity ratio of this system will be
- 8
- 2
- 4
- 107 dynes
- 6
Q16 | A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in 10 sec. The distance between the locomotive and the wagons at this instant assuming that the forces acting on the train are unaltered would be
- 0.36 m
- 0.44 m
- 0.77 m.
- 0.5 m
- 0.66 m
Q17 | A dash pot consists of a cylinder 10 cm in diameter in which slides a piston 12 cm long having a radial clearance of 1 mm. The cylinder is filled with oil having a viscosity of 1 poise. What will be the resistance offered by the piston to sliding with a velocity of 3 cm/sec
- 1090 kg
- 100 kg
- 10900 kg
- 10 kg
- 50 kg
Q18 | A roller coaster reaches a velocity of 20 m/s at a location where the radius of curvature is 40 m. Calculate the acceleration in m/s2?
- 10
- 9
- 11
- 8
- 107 dynes
Q19 | Rain drops (assumed to be spherical) of radii R1, 2R1, 3R, 4R,
- all of them will be zero
- all of them will be same
- drops of radius R will be maximum
- drops of radius R will be minimum
- 107 dynes
Q20 | A rigid body is in equilibrium under the action of these forces when
- These forces are equal
- The lines of action of these forces are parallel
- The lines of action of these forces meet in a point
- (A) and (B) above
- (B) and (C) above
Q21 | The coefficient of static friction will have the highest value in case of
- Mild steel and mild steel
- Mild steel and copper
- Cast iron and steel
- Rope and wood
- Any of the above loctions
Q22 | A wheel accelerates from rest with an acceleration of 6 rad/sec2. How many revolutions are experienced in 4 seconds?
- 12.36
- 25.6
- 9.82
- 107 dynes
- 7.64
Q23 | The moment of inertia of a body does not depend upon
- The angular velocity of the body
- Mass of the body
- The distribution of mass in the body
- The axis of rotation of the body
- None of the above
Q24 | The tension in the wire rope supporting a lift moving with a uniform velocity
- Is more when the lift is moving upwards
- Is more when the lift is moving downwards
- Is less when the lift is moving down-wards
- Is less when the lift is moving upwards
- Remains constant irrespective of the lift movement
Q25 | A machine requires an effort of 10 kg to lift a load of 250 kg and an effort of 13 kg for a load of 400 kg. The effort required to lift a load of 500 kg will be
- 25 kg
- 107 dynes
- 15 kg
- 35 kg
- 45 kg