McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 1. |
A point moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one. The locus of the path traced by the point will be a |
| A. | Cycloid |
| B. | Hyperbola |
| C. | Circle |
| D. | Involute |
| E. | Ellipsc |
| Answer» D. Involute | |
| 2. |
A cannon of barrel length 2 m fires a shell of weight 6 kg with a muzzle velocity of 50 m/sec. The force exerted by the gases on the shell would be approximately |
| A. | 76 t |
| B. | 19 t |
| C. | 152 t |
| D. | 8.5 t |
| E. | 38 t |
| Answer» E. 38 t | |
| 3. |
According to the principle of transmissibility of forces, when a force acts upon a body ; its effect is |
| A. | Minimum when it acts at C.G. of the body |
| B. | Maximum when it acts at C.G. of the body |
| C. | Different at different points of body |
| D. | Same at every point in its line of action |
| E. | None of the above |
| Answer» D. Same at every point in its line of action | |
| 4. |
Using force, length and time as fundamental quantities, the dimensions of mass would be |
| A. | FL-2T+2 |
| B. | FL-1T+2 |
| C. | FL-1T+1 |
| D. | 107 dynes |
| E. | FL-2T+1 |
| Answer» B. FL-1T+2 | |
| 5. |
Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is |
| A. | 5.45 KW |
| B. | 7.5 KW |
| C. | 6.81 KW |
| D. | Tapered bearing |
| E. | 66.8 KW |
| Answer» C. 6.81 KW | |
| 6. |
A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will |
| A. | Increase |
| B. | Decrease |
| C. | Not change |
| D. | Decrease but reduction depends on viscosity of oil |
| E. | None of the above |
| Answer» A. Increase | |
| 7. |
A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly |
| A. | 2.5 N |
| B. | 3 N |
| C. | 2 N |
| D. | 4.5 N |
| E. | 4.9 N |
| Answer» D. 4.5 N | |
| 8. |
Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be |
| A. | 100 |
| B. | 28 |
| C. | 41 |
| D. | 14 |
| E. | 10 |
| Answer» E. 10 | |
| 9. |
The resultant of coplaner parallel forces is found by load line diagram, while the position is found by |
| A. | link polygen |
| B. | funicular polygon |
| C. | string polygon |
| D. | any of the above |
| E. | 107 dynes |
| Answer» D. any of the above | |
| 10. |
The units of moment of inertia of an area are |
| A. | kg - m |
| B. | m4 |
| C. | kg - m4 |
| D. | kg - m3 |
| E. | (kg - m)2 |
| Answer» B. m4 | |
| 11. |
Te dimensions of frequency are |
| A. | 107 dynes |
| B. | MLT |
| C. | L-1 |
| D. | T-1 |
| E. | L-1T-1 |
| Answer» D. T-1 | |
| 12. |
When a train is rounding a curve to prevent side thrust on the wheel flanges of cars |
| A. | Opposite thrust is created to counter balance this thrust |
| B. | Guide rail sections are provided to take care of thrust |
| C. | Thrust eliminators are provided in the train |
| D. | Outside rails are realised |
| E. | Rail section is made thick on curvature |
| Answer» D. Outside rails are realised | |
| 13. |
Instantaneous centre for a rolling wheel on a straight track will be at |
| A. | 107 dynes |
| B. | A |
| C. | B |
| D. | C |
| E. | D |
| Answer» E. D | |
| 14. |
A 100 kg flywheel having a radius of gyration of 1 m is rotating at 1000 rpm. The angular momentum of the flywheel about its axis of rotation, in kg m2/s is |
| A. | 1000 |
| B. | 107 dynes |
| C. | 10,000 |
| D. | 10,470 |
| E. | 5235 |
| Answer» D. 10,470 | |
| 15. |
M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is |
| A. | 50 Kgm2 |
| B. | Tapered bearing |
| C. | 100 Kgm2 |
| D. | 25 Kgm2 |
| E. | 12.5 Kgm2 |
| Answer» A. 50 Kgm2 | |
| 16. |
Three forces A, B and C of magnitudes 8 N, 12 N and 20 N acting on a particle are in equilibrim. It can be concluded that |
| A. | 107 dynes |
| B. | B and C act in opposite directions |
| C. | one of the forces in non-coplaner |
| D. | A and B act at 90? |
| E. | one of the forces is non-concurrent |
| Answer» B. B and C act in opposite directions | |
| 17. |
A cylindrical bar 10 metres long elongates 0.1 mm under a load. The strain in the material of the bar will be |
| A. | 10--4 |
| B. | 10--5 |
| C. | 10--7 |
| E. | All of the above |
| Answer» B. 10--5 | |
| 18. |
The limiting force of fiction is |
| A. | The friction force acting on a body when it is in motion |
| B. | The value of friction force which stops the movement of the body |
| C. | The value of friction force which cannot exceed under a situation |
| D. | The friction force acting when the body is just about to move |
| E. | Double of the normal friction |
| Answer» D. The friction force acting when the body is just about to move | |
| 19. |
If a solid sphere rolls on a horizontal surface, then the ratio of its rotational kinetic energy to its total kinetic energy is |
| A. | 1 ; 7 |
| B. | 3 ; 7 |
| C. | 107 dynes |
| D. | 4 ; 7 |
| E. | 2 ; 7 |
| Answer» E. 2 ; 7 | |
| 20. |
Which of the following is scalar quantity |
| A. | Area of triangle |
| B. | Displacement of a particle |
| C. | Acceleration of car |
| D. | Force of friction |
| E. | Velocity a gear |
| Answer» A. Area of triangle | |
| 21. |
The gravitational field at the surface of the moon is one sixth of that at the surface of the earth. A 72 kg man weighs on the surface of the moon |
| A. | 137.7 N |
| B. | 250 |
| C. | 72 N |
| D. | 420 N |
| E. | 117.7 N |
| Answer» E. 117.7 N | |
| 22. |
If three non-parallel forces hold a rigid body in equilibrium, they must |
| A. | be non-coneurrent |
| B. | be colinear |
| C. | 107 dynes |
| D. | be equal in magnitude |
| E. | be concurrent |
| Answer» E. be concurrent | |
| 23. |
A stone dropped from a baloon that was ascending at the rate of 30 ft/sec, reaches ground after 10 secs. The height of the baloon where stone was dropped was |
| A. | 3420 ft |
| B. | 107 dynes |
| C. | 4520 ft |
| D. | 2310 ft |
| E. | 1310 ft |
| Answer» E. 1310 ft | |
| 24. |
A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is |
| A. | 107 dynes |
| B. | i + j + k |
| C. | 2i + 3j |
| D. | zero |
| E. | i - j - k |
| Answer» B. i + j + k | |
| 25. |
An iron sphere of mass 30 kg and an aluminium sphere of mass 10 kg, both having the same diameter are dropped vertically from a cliff. When they are 10 metrs from the ground, they have identical |
| A. | Accelerations |
| B. | Momenta |
| C. | Kinetic energies |
| D. | Potential energies |
| E. | All of the above |
| Answer» A. Accelerations | |
| 26. |
In actual machines |
| A. | Mechanical advantage is unity |
| B. | Mechanical advantage is greater than velocity ratio |
| C. | Mechanical advantage is less than velocity ratio |
| D. | Mechanical advantage is less than unity |
| E. | Mechanical advantage is equal to velocity ratio |
| Answer» C. Mechanical advantage is less than velocity ratio | |
| 27. |
The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be |
| A. | 137.5 cm4 |
| B. | 107 dynes |
| C. | 275 cm4 |
| D. | 550 cm4 |
| E. | 1100 cm4 |
| Answer» C. 275 cm4 | |
| 28. |
Which of the following is not a unit of energy? |
| A. | Joule |
| B. | kW |
| C. | N-m |
| D. | Electron volt |
| E. | Watt-hour |
| Answer» B. kW | |
| 29. |
If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm |
| A. | the angular velocity will remain constant |
| B. | the angular momentum will increase |
| C. | the angular velocity will decrease |
| D. | his moment of inertia will decrease |
| E. | 107 dynes |
| Answer» D. his moment of inertia will decrease | |
| 30. |
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 |
| A. | 2.7 |
| B. | 2.55 |
| C. | 107 dynes |
| D. | 2.6 |
| E. | 2.65 |
| Answer» A. 2.7 | |
| 31. |
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 |
| A. | 5000 J |
| B. | 2500 J |
| C. | 509.68 J |
| D. | None of the above |
| E. | Tapered bearing |
| Answer» D. None of the above | |
| 32. |
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 |
| A. | 3 sec |
| B. | 5 sec |
| C. | 4 sec |
| D. | 4.5 sec |
| E. | 2 sec |
| Answer» E. 2 sec | |
| 33. |
The moment of a force is |
| A. | Equivalent to the algebraic sum of the moments acting on a body |
| B. | Equivalent to the sum of horizontal as well as vertical components of the moments on a body |
| C. | Equivalent to the sum of the moments acting on a body |
| D. | Equivalent to the sum of horizontal components of the moments on a body |
| E. | Equivalent to the vertical sum of the moments acting on a body |
| Answer» A. Equivalent to the algebraic sum of the moments acting on a body | |
| 34. |
Which of the following statement is false? |
| A. | The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant) |
| B. | 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 |
| C. | 107 dynes |
| D. | A cyclist should move along a zig-zag path while ascending a steep hill |
| E. | The density of milk decreases when cream is taken out of milk |
| Answer» E. The density of milk decreases when cream is taken out of milk | |
| 35. |
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? |
| A. | 60? |
| B. | 45? |
| C. | 30? |
| D. | 15? |
| E. | Either of (A) and (C) |
| Answer» E. Either of (A) and (C) | |
| 36. |
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 |
| A. | 2.45 m/sec2 |
| B. | 4.00 m/sec2 |
| C. | 0.25 m/sec2 |
| D. | 4.16 m/sec2 |
| E. | 1.25 m/sec2 |
| Answer» A. 2.45 m/sec2 | |
| 37. |
A flywheel 200 cm in diameter is rotating at 100 rpm. A point one the rim of the flywheel will not have |
| A. | angular velocity |
| B. | centripetal acceleration |
| C. | tangential acceleration |
| D. | all of the above |
| E. | 107 dynes |
| Answer» A. angular velocity | |
| 38. |
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? |
| A. | Slide along the ground by pushing |
| B. | Ask for cranes |
| C. | Pull it |
| D. | Tip it over |
| E. | Lift it bodily |
| Answer» D. Tip it over | |
| 39. |
The centroid of a triangle is at the inter-section of |
| A. | perpendicular bisectors |
| B. | 107 dynes |
| C. | base and perpendicular from opposite vertex |
| D. | perpendiculars down from the corners |
| E. | medians |
| Answer» E. medians | |
| 40. |
If there are 3 pulleys in the first system, then the velocity ratio of this system will be |
| A. | 8 |
| B. | 2 |
| C. | 4 |
| D. | 107 dynes |
| E. | 6 |
| Answer» A. 8 | |
| 41. |
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 |
| A. | 0.36 m |
| B. | 0.44 m |
| C. | 0.77 m. |
| D. | 0.5 m |
| E. | 0.66 m |
| Answer» D. 0.5 m | |
| 42. |
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 |
| A. | 1090 kg |
| B. | 100 kg |
| C. | 10900 kg |
| D. | 10 kg |
| E. | 50 kg |
| Answer» C. 10900 kg | |
| 43. |
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? |
| A. | 10 |
| B. | 9 |
| C. | 11 |
| D. | 8 |
| E. | 107 dynes |
| Answer» A. 10 | |
| 44. |
Rain drops (assumed to be spherical) of radii R1, 2R1, 3R, 4R, |
| A. | all of them will be zero |
| B. | all of them will be same |
| C. | drops of radius R will be maximum |
| D. | drops of radius R will be minimum |
| E. | 107 dynes |
| Answer» D. drops of radius R will be minimum | |
| 45. |
A rigid body is in equilibrium under the action of these forces when |
| A. | These forces are equal |
| B. | The lines of action of these forces are parallel |
| C. | The lines of action of these forces meet in a point |
| D. | (A) and (B) above |
| E. | (B) and (C) above |
| Answer» E. (B) and (C) above | |
| 46. |
The coefficient of static friction will have the highest value in case of |
| A. | Mild steel and mild steel |
| B. | Mild steel and copper |
| C. | Cast iron and steel |
| D. | Rope and wood |
| E. | Any of the above loctions |
| Answer» D. Rope and wood | |
| 47. |
A wheel accelerates from rest with an acceleration of 6 rad/sec2. How many revolutions are experienced in 4 seconds? |
| A. | 12.36 |
| B. | 25.6 |
| C. | 9.82 |
| D. | 107 dynes |
| E. | 7.64 |
| Answer» E. 7.64 | |
| 48. |
The moment of inertia of a body does not depend upon |
| A. | The angular velocity of the body |
| B. | Mass of the body |
| C. | The distribution of mass in the body |
| D. | The axis of rotation of the body |
| E. | None of the above |
| Answer» A. The angular velocity of the body | |
| 49. |
The tension in the wire rope supporting a lift moving with a uniform velocity |
| A. | Is more when the lift is moving upwards |
| B. | Is more when the lift is moving downwards |
| C. | Is less when the lift is moving down-wards |
| D. | Is less when the lift is moving upwards |
| E. | Remains constant irrespective of the lift movement |
| Answer» E. Remains constant irrespective of the lift movement | |
| 50. |
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 |
| A. | 25 kg |
| B. | 107 dynes |
| C. | 15 kg |
| D. | 35 kg |
| E. | 45 kg |
| Answer» C. 15 kg | |
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