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.
| 551. |
When two elastic bodies collide with each other, |
| A. | The two bodies will momentarily come to rest after collision |
| B. | The two bodies tend to compress and deform at the surface of contact |
| C. | The two bodies begin to regain their original shape |
| D. | All of the above |
| Answer» E. | |
| 552. |
In order to completely specify angular displacement by a vector, it must fix |
| A. | Direction of the axis of rotation |
| B. | Magnitude of angular displacement |
| C. | Sense of angular displacement |
| D. | All of these |
| Answer» E. | |
| 553. |
The force induced in the string BC due to the load 'W' as shown in the below figure is |
| A. | W sinθ |
| B. | W cosθ |
| C. | W tanθ |
| D. | W cotθ |
| Answer» E. | |
| 554. |
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction |
| A. | Along the plane |
| B. | Horizontally |
| C. | Vertically |
| D. | At an angle equal to the angle of friction to the inclined plane |
| Answer» E. | |
| 555. |
Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration. |
| A. | Upwards |
| B. | Downwards |
| C. | Horizontal |
| D. | None of these |
| Answer» B. Downwards | |
| 556. |
The below figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then |
| A. | P/sin β = Q/sin α = R/sin ɣ |
| B. | P/sin α = Q/sin β = R/sin ɣ |
| C. | P/sin ɣ = Q/sin α = R/sin β |
| D. | P/sin α = Q/sin ɣ = R/sin β |
| Answer» C. P/sin ‚Ķ¬£ = Q/sin ≈í¬± = R/sin ≈í‚⧠| |
| 557. |
The unit of angular velocity is |
| A. | m/min |
| B. | rad/s |
| C. | Revolutions/min |
| D. | Both (B) and (C) |
| Answer» E. | |
| 558. |
The length of a second's pendulum is |
| A. | 94.9 cm |
| B. | 99.4 cm |
| C. | 100 cm |
| D. | 101 cm |
| Answer» C. 100 cm | |
| 559. |
The angular velocity (in rad/s) of a body rotating at N revolutions per minute is |
| A. | πN/60 |
| B. | πN/180 |
| C. | 2πN/60 |
| D. | 2πN/180 |
| Answer» D. 2≈ì√ÑN/180 | |
| 560. |
The unit of force in S.I. system of units is |
| A. | Dyne |
| B. | Kilogram |
| C. | Newton |
| D. | Watt |
| Answer» D. Watt | |
| 561. |
If a number of forces are acting at a point, their resultant will be inclined at an angle 'θ' with the horizontal, such that$ |
| A. | tanθ = ΣH/ΣV |
| B. | tanθ = ΣV/ΣH |
| C. | tanθ = ΣV × ΣH |
| D. | tanŒ∏ = ‚à ö(Œ£V + Œ£H) |
| Answer» C. tan≈í‚àè = ≈í¬£V ‚àö√≥ ≈í¬£H | |
| 562. |
In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC. |
| A. | Half |
| B. | Equal to |
| C. | Double |
| D. | None of these |
| Answer» B. Equal to | |
| 563. |
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)$ |
| A. | P = W tan (α - φ) |
| B. | P = W tan (α + φ) |
| C. | P = W tan (φ - α) |
| D. | P = W cos (α + φ) |
| Answer» C. P = W tan (≈ì√ú - ≈í¬±) | |
| 564. |
The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is |
| A. | h/(kG² + h²) |
| B. | (kG² + h²)/h |
| C. | h²/(kG² + h²) |
| D. | (kG² + h²)/h² |
| Answer» C. h¬¨‚â§/(kG¬¨‚⧠+ h¬¨‚â§) | |
| 565. |
The resultant of two equal forces ‘P’ making an angle ‘θ’, is given by$ |
| A. | 2P sinθ/2 |
| B. | 2P cosθ/2 |
| C. | 2P tanθ/2 |
| D. | 2P cotθ/2 |
| Answer» C. 2P tan≈í‚àè/2 | |
| 566. |
The centre of gravity a T-section 100 mm √ó 150 mm √ó 50 mm from its bottom is$ |
| A. | 50 mm |
| B. | 75 mm |
| C. | 87.5 mm |
| D. | 125 mm |
| Answer» D. 125 mm | |
| 567. |
A pair of smith's tongs is an example of the lever of |
| A. | Zeroth order |
| B. | First order |
| C. | Second order |
| D. | Third order |
| Answer» D. Third order | |
| 568. |
The impact between two lead spheres is approximately equal to an __________ impact. |
| A. | Elastic |
| B. | Inelastic |
| C. | Solid |
| D. | None of these |
| Answer» C. Solid | |
| 569. |
Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is |
| A. | (2/3) Ml² |
| B. | (1/3) Ml² |
| C. | (3/4) Ml² |
| D. | (1/12) Ml² |
| Answer» E. | |
| 570. |
One joule is equal to |
| A. | 0.1 N-m |
| B. | 1 N-m |
| C. | 10 N-m |
| D. | 100 N-m |
| Answer» C. 10 N-m | |
| 571. |
A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.) |
| A. | MS/3 |
| B. | MS/4 |
| C. | MS/5 |
| D. | None of these |
| Answer» D. None of these | |
| 572. |
When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as |
| A. | Simple pendulum |
| B. | Compound pendulum |
| C. | Torsional pendulum |
| D. | Second's pendulum |
| Answer» C. Torsional pendulum | |
| 573. |
A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction. |
| A. | Increase |
| B. | Decrease |
| C. | Not be effected |
| D. | None of these |
| Answer» B. Decrease | |
| 574. |
According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.) |
| A. | IP = IG + Ah2 |
| B. | IP = IG - Ah2 |
| C. | IP = IG / Ah2 |
| D. | IP = Ah2 / IG |
| Answer» B. IP = IG - Ah2 | |
| 575. |
The velocity of a body on reaching the ground from a height h, is |
| A. | 2.‚à ö(gh) |
| B. | ‚à ö(gh) |
| C. | ‚à ö(2gh) |
| D. | 2g.‚à öh |
| Answer» D. 2g.‚Äö√ √∂h | |
| 576. |
The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to$ |
| A. | The algebraic sum of the resolved parts of the forces in the given direction |
| B. | The sum of the resolved parts of the forces in the given direction |
| C. | The difference of the forces multiplied by the cosine of θ |
| D. | The sum of the forces multiplied by the sine of θ |
| Answer» B. The sum of the resolved parts of the forces in the given direction | |
| 577. |
Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is |
| A. | db³/12 |
| B. | bd³/12 |
| C. | db³/36 |
| D. | bd³/36 |
| Answer» B. bd¬¨‚â•/12 | |
| 578. |
A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is |
| A. | Reversible |
| B. | Non-reversible |
| C. | Ideal |
| D. | None of these |
| Answer» B. Non-reversible | |
| 579. |
If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is _________ the momentum of body having mass m2. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 580. |
When the spring of a watch is wound, it will possess |
| A. | Strain energy |
| B. | Kinetic energy |
| C. | Heat energy |
| D. | Electrical energy |
| Answer» B. Kinetic energy | |
| 581. |
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is |
| A. | D/(d‚ÇÅ + d‚ÇÇ) |
| B. | D/(d‚ÇÅ - d‚ÇÇ) |
| C. | 2D/(d‚ÇÅ + d‚ÇÇ) |
| D. | 2D/(d‚ÇÅ - d‚ÇÇ) |
| Answer» E. | |
| 582. |
The maximum velocity of a particle moving with simple harmonic motion is |
| A. | ω |
| B. | ωr |
| C. | ω2r |
| D. | ω/r |
| Answer» C. ≈ì√¢2r | |
| 583. |
The center of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius. |
| A. | 3r/ 8 |
| B. | 4r/ 3π |
| C. | 8r/3 |
| D. | 3r/4π |
| Answer» C. 8r/3 | |
| 584. |
A machine having an efficiency less than 50%, is known as |
| A. | Reversible machine |
| B. | Non-reversible machine |
| C. | Neither reversible nor non-reversible machine |
| D. | Ideal machine |
| Answer» C. Neither reversible nor non-reversible machine | |
| 585. |
A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to |
| A. | 25 |
| B. | 50 |
| C. | 100 |
| D. | 250 |
| Answer» C. 100 | |
| 586. |
When a body of mass moment of inertia 'I' (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is |
| A. | Iω |
| B. | Iω2 |
| C. | 0.5 Iω |
| D. | 0.5 Iω2 |
| Answer» E. | |
| 587. |
In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load. |
| A. | Less than |
| B. | Equal to |
| C. | More than |
| D. | None of these |
| Answer» B. Equal to | |
| 588. |
Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base. |
| A. | Nine times |
| B. | Six times |
| C. | Four times |
| D. | Two times |
| Answer» B. Six times | |
| 589. |
If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,# |
| A. | P + m.a = 0 |
| B. | P - m.a = 0 |
| C. | P √ó m.a = 0 |
| D. | P/m.a = 0 |
| Answer» C. P ‚àö√≥ m.a = 0 | |
| 590. |
The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.) |
| A. | h/2 |
| B. | h/3 |
| C. | h/4 |
| D. | h/6 |
| Answer» D. h/6 | |
| 591. |
The velocity ratio of a single purchase crab winch can be increased by |
| A. | Increasing the length of the handle |
| B. | Increasing the radius of the load drum |
| C. | Increasing the number of teeth of the pinion |
| D. | All of the above |
| Answer» B. Increasing the radius of the load drum | |
| 592. |
The moment of inertia of a square of side a about its diagonal is |
| A. | a²/8 |
| B. | a³/12 |
| C. | a‚Å¥/12 |
| D. | a‚Å¥/16 |
| Answer» D. a‚Äö√Ö¬•/16 | |
| 593. |
Static friction is always __________ dynamic friction. |
| A. | Equal to |
| B. | Less than |
| C. | Greater than |
| D. | None of these |
| Answer» D. None of these | |
| 594. |
The ratio of static friction to dynamic friction is always |
| A. | Equal to one |
| B. | Less than one |
| C. | Greater than one |
| D. | None of these |
| Answer» D. None of these | |
| 595. |
During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact. |
| A. | Equal to |
| B. | Equal and opposite to |
| C. | Less than |
| D. | Greater than |
| Answer» C. Less than | |
| 596. |
The maximum mechanical advantage of a lifting machine is |
| A. | 1 + m |
| B. | 1 - m |
| C. | 1 / m |
| D. | m |
| Answer» D. m | |
| 597. |
A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t² (t - 4), the acceleration of the particle will be given by the equation# |
| A. | 6t² - 8t |
| B. | 3t² + 2t |
| C. | 6f - 8 |
| D. | 6f - 4 |
| Answer» D. 6f - 4 | |
| 598. |
The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as |
| A. | Coplanar concurrent forces |
| B. | Coplanar non-concurrent forces |
| C. | Like parallel forces |
| D. | Unlike parallel forces |
| Answer» E. | |
| 599. |
The power developed by a body acted upon by a torque 'T' Newton meter (N - m) and revolving at ω radian/s is given by# |
| A. | T.ω (in watts) |
| B. | T.ω/60 (in watts) |
| C. | T.ω/75 (in kilowatts) |
| D. | T.ω/4500 (in kilowatts) |
| Answer» B. T.≈ì√¢/60 (in watts) | |
| 600. |
A pendulum which executes one beat per second is known as |
| A. | Simple pendulum |
| B. | Compound pendulum |
| C. | Torsional pendulum |
| D. | Second's pendulum |
| Answer» E. | |