MCQOPTIONS
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MCQOPTIONS
This section includes 606 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
_ The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)$? |
| A. | (1/2œÄ). ‚à ö(l/g) |
| B. | (1/2œÄ). ‚à ö(g/l) |
| C. | 2œÄ. ‚à ö(l/g) |
| D. | None of these |
| Answer» D. None of these | |
| 402. |
_ Pick up wrong statement about friction force for dry surfaces. Friction force is$? |
| A. | Proportional to normal load between the surfaces |
| B. | Dependent on the materials of contact surface |
| C. | Proportional to velocity of sliding |
| D. | Independent of the area of contact surfaces |
| Answer» D. Independent of the area of contact surfaces | |
| 403. |
_ Coefficient of friction is the$? |
| A. | Angle between normal reaction and the resultant of normal reaction and the limiting friction |
| B. | Ratio of limiting friction and normal reaction |
| C. | The friction force acting when the body is just about to move |
| D. | The friction force acting when the body is in motion |
| Answer» C. The friction force acting when the body is just about to move | |
| 404. |
_ Center of percussion is$? |
| A. | The point of C.G. |
| B. | The point of metacenter |
| C. | The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis |
| D. | Point of suspension |
| Answer» D. Point of suspension | |
| 405. |
_ The moment of inertia of a square of side (a) about an axis through its center of gravity is$? |
| A. | a4/4 |
| B. | a4/8 |
| C. | a4/12 |
| D. | a4/36 |
| Answer» D. a4/36 | |
| 406. |
_ In actual machines, mechanical advantage is _________ velocity ratio.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» C. Greater than | |
| 407. |
_ If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella$? |
| A. | More inclined when moving |
| B. | Less inclined when moving |
| C. | More inclined when standing |
| D. | Less inclined when standing |
| Answer» E. | |
| 408. |
_ In the lever of third order, load ‘W’, effort ‘P’ and fulcrum ‘F’ are oriented as follows$? |
| A. | W between P and F |
| B. | F between W and P |
| C. | P between W and F |
| D. | W, P and F all on one side |
| Answer» B. F between W and P | |
| 409. |
_ The bodies which rebound after impact are called$? |
| A. | Inelastic bodies |
| B. | Elastic bodies |
| C. | Neither elastic nor inelastic bodies |
| D. | None of these |
| Answer» C. Neither elastic nor inelastic bodies | |
| 410. |
_ The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as$? |
| A. | Static friction |
| B. | Dynamic friction |
| C. | Limiting friction |
| D. | Coefficient of friction |
| Answer» D. Coefficient of friction | |
| 411. |
_ A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)$? |
| A. | P = W tanα |
| B. | P = W tan (α + φ) |
| C. | P = W (sinα + μcosα) |
| D. | P = W (cosα + μsinα) |
| Answer» D. P = W (cos≈í¬± + ≈í¬∫sin≈í¬±) | |
| 412. |
_ The unit of work in S.I. units is$? |
| A. | Newton |
| B. | erg |
| C. | kg-m |
| D. | joule |
| Answer» E. | |
| 413. |
_ The term 'Centroid' is$? |
| A. | The same as centre of gravity |
| B. | The point of suspension |
| C. | The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis |
| D. | None of the above |
| Answer» B. The point of suspension | |
| 414. |
_ The motion of a wheel of a car is$? |
| A. | Purely translation |
| B. | Purely rotational |
| C. | Combined translation and rotational |
| D. | None of these |
| Answer» D. None of these | |
| 415. |
_ The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is$? |
| A. | D/(D - d) |
| B. | D/(D + d) |
| C. | 2D/(D - d) |
| D. | 2D/(D + d) |
| Answer» D. 2D/(D + d) | |
| 416. |
_ The velocity ratio of a first system of pulleys with 4 pulleys is$? |
| A. | 4 |
| B. | 8 |
| C. | 16 |
| D. | 20 |
| Answer» D. 20 | |
| 417. |
__Limiting force of friction is the__ |
| A. | Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction |
| B. | Ratio of limiting friction and normal reaction |
| C. | The friction force acting when the body is just about to move |
| D. | The friction force acting when the body is in motion |
| Answer» D. The friction force acting when the body is in motion | |
| 418. |
__Lami's theorem states that__ |
| A. | Three forces acting at a point will be in equilibrium |
| B. | Three forces acting at a point can be represented by a triangle, each side being proportional to force |
| C. | If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium |
| D. | If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two |
| Answer» E. | |
| 419. |
__The C.G. of a solid hemisphere lies on the central radius 3r__ |
| A. | At distance — from the plane base 3r |
| B. | At distance — from the plane base 3r |
| C. | At distance — from the plane base 3r |
| D. | At distance — from the plane base |
| Answer» E. | |
| 420. |
__When trying to turn a key into a lock, following is applied__ |
| A. | Coplanar force |
| B. | Non-coplanar forces |
| C. | Moment |
| D. | Couple |
| Answer» E. | |
| 421. |
__The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ ‚à ö(gra/h)__ |
| A. | Less than |
| B. | Greater than |
| C. | Equal to |
| D. | None of these |
| Answer» B. Greater than | |
| 422. |
_The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.$? |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» B. Less than | |
| 423. |
_If a number of forces are acting at a point, their resultant is given by$? |
| A. | (‚à ëV)2 + (‚à ëH)2 |
| B. | ‚à ö[(‚à ëV)2 + (‚à ëH)2] |
| C. | (‚à ëV)2 +(‚à ëH)2 +2(‚à ëV)(‚à ëH) |
| D. | ‚à ö[(‚à ëV)2 +(‚à ëH)2 +2(‚à ëV)(‚à ëH)] |
| Answer» C. (‚Äö√ √´V)2 +(‚Äö√ √´H)2 +2(‚Äö√ √´V)(‚Äö√ √´H) | |
| 424. |
_Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are$? |
| A. | 15 N and 5 N |
| B. | 20 N and 5 N |
| C. | 15 N and 15 N |
| D. | None of these |
| Answer» B. 20 N and 5 N | |
| 425. |
_The principle of transmissibility of forces states that, when a force acts upon a body, its effect is$? |
| A. | Same at every point on its line of action |
| B. | Different at different points on its line of action |
| C. | Minimum, if it acts at the center of gravity of the body |
| D. | Maximum, if it acts at the center of gravity of the body |
| Answer» D. Maximum, if it acts at the center of gravity of the body | |
| 426. |
_The point, through which the whole weight of the body acts, irrespective of its position, is known as$? |
| A. | Moment of inertia |
| B. | Center of gravity |
| C. | Center of percussion |
| D. | Center of mass |
| Answer» C. Center of percussion | |
| 427. |
_The maximum efficiency of a screw jack is$? |
| A. | (1 - sinφ)/(1 + sinφ) |
| B. | (1 + sinφ)/(1 - sinφ) |
| C. | (1 - tanφ)/(1 + tanφ) |
| D. | (1 + tanφ)/(1 - tanφ) |
| Answer» B. (1 + sin≈ì√ú)/(1 - sin≈ì√ú) | |
| 428. |
_The motion of a particle round a fixed axis is$? |
| A. | Translatory |
| B. | Rotary |
| C. | Circular |
| D. | Translatory as well as rotary |
| Answer» D. Translatory as well as rotary | |
| 429. |
_When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.$? |
| A. | Inward |
| B. | Outward |
| C. | Towards front |
| D. | Towards back |
| Answer» B. Outward | |
| 430. |
_The forces, which meet at one point and their lines of action also lie on the same plane, are known as$? |
| A. | Coplanar concurrent forces |
| B. | Coplanar non-concurrent forces |
| C. | Non-coplanar concurrent forces |
| D. | Non-coplanar non-concurrent forces |
| Answer» B. Coplanar non-concurrent forces | |
| 431. |
_A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of$? |
| A. | 1 m |
| B. | 2 m |
| C. | 3 m |
| D. | 4 m |
| Answer» C. 3 m | |
| 432. |
_One kg force is equal to$? |
| A. | 7.8 N |
| B. | 8.9 N |
| C. | 9.8 N |
| D. | 12 N |
| Answer» D. 12 N | |
| 433. |
_Which of the following is not the unit of pressure?$? |
| A. | kg/cm |
| B. | Bar |
| C. | Atmosphere |
| D. | Newton |
| Answer» E. | |
| 434. |
_The resultant of two forces P and Q acting at an angle θ is$? |
| A. | ‚à ö(P¬≤ + Q¬≤ + 2PQ sinŒ∏) |
| B. | ‚à ö(P¬≤ + Q¬≤ + 2PQ cosŒ∏) |
| C. | ‚à ö(P¬≤ + Q¬≤ - 2PQ cosŒ∏) |
| D. | ‚à ö(P¬≤ + Q¬≤ - 2PQ tanŒ∏) |
| Answer» C. ‚Äö√ √∂(P¬¨‚⧠+ Q¬¨‚⧠- 2PQ cos≈í‚àè) | |
| 435. |
_Moment of inertia of a hollow circular section, as shown in the below figure about X-axis, is$? |
| A. | π/16 (D² - d²) |
| B. | π/16 (D³ - d³) |
| C. | π/32 (D⁴ - d⁴) |
| D. | π/64 (D⁴ - d⁴) |
| Answer» E. | |
| 436. |
_The angle between two forces when the resultant is maximum and minimum respectively are$? |
| A. | 0° and 180° |
| B. | 180° and 0° |
| C. | 90° and 180° |
| D. | 90° and 0° |
| Answer» B. 180¬¨‚àû and 0¬¨‚àû | |
| 437. |
_The energy possessed by a body, for doing work by virtue of its position, is called$? |
| A. | Potential energy |
| B. | Kinetic energy |
| C. | Electrical energy |
| D. | Chemical energy |
| Answer» B. Kinetic energy | |
| 438. |
_In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is$? |
| A. | 50 |
| B. | 100 |
| C. | 200 |
| D. | 400 |
| Answer» C. 200 | |
| 439. |
_Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point$? |
| A. | Same as |
| B. | Twice |
| C. | Thrice |
| D. | Four times |
| Answer» E. | |
| 440. |
_An ideal machine is one whose efficiency is$? |
| A. | Between 60 and 70 % |
| B. | Between 70 and 80% |
| C. | Between 80 and 90% |
| D. | 100% |
| Answer» E. | |
| 441. |
_The moment of inertia of a sphere of mass 'm' and radius 'r', about an axis tangential to it, is$? |
| A. | 2mr²/3 |
| B. | 2mr²/5 |
| C. | 7mr²/3 |
| D. | 7mr²/5 |
| Answer» E. | |
| 442. |
_A smooth cylinder lying on a __________ is in neutral equilibrium.$? |
| A. | Curved surface |
| B. | Convex surface |
| C. | Horizontal surface |
| D. | None of these |
| Answer» D. None of these | |
| 443. |
_A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act$? |
| A. | Towards the wall at its upper end |
| B. | Away from the wall at its upper end |
| C. | Downward at its upper end |
| D. | Upward at its upper end |
| Answer» E. | |
| 444. |
_In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will$? |
| A. | Increase |
| B. | Decrease |
| C. | Remain the same |
| D. | None of these |
| Answer» C. Remain the same | |
| 445. |
_The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)$? |
| A. | œâ.‚à ö(y¬≤ - r¬≤) |
| B. | œâ.‚à ö(r¬≤ - y¬≤) |
| C. | œâ¬≤.‚à ö(y¬≤ - r¬≤) |
| D. | œâ¬≤.‚à ö(r¬≤ - y¬≤) |
| Answer» C. ≈ì√¢¬¨‚â§.‚Äö√ √∂(y¬¨‚⧠- r¬¨‚â§) | |
| 446. |
_The moment of inertia of a solid sphere of mass ‘m’ and radius ‘r’ is$? |
| A. | 2mr²/3 |
| B. | 2mr²/5 |
| C. | mr² |
| D. | mr²/2 |
| Answer» C. mr¬¨‚⧠| |
| 447. |
_A framed structure is perfect if it contains members equal to (Where, n = number of joints in a frame)$? |
| A. | 2n³ |
| B. | 2n |
| C. | n² |
| D. | 3n² |
| Answer» B. 2n | |
| 448. |
_The centre of gravity of a uniform lamina lies at$? |
| A. | The centre of heavy portion |
| B. | The bottom surface |
| C. | The midpoint of its axis |
| D. | All of the above |
| Answer» D. All of the above | |
| 449. |
_A framed structure, as shown in the below figure, is a$? |
| A. | Perfect frame |
| B. | Deficient frame |
| C. | Redundant frame |
| D. | None of the above |
| Answer» B. Deficient frame | |
| 450. |
_Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)$? |
| A. | v = u + a.t |
| B. | s = u.t + ¬Ω a.t2 |
| C. | v2 = u2 + 2a.s |
| D. | All of these |
| Answer» E. | |