Applied Mechanics Set 9

Mechanical Engineering

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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 9

Q1 | The angular velocity of earth is
  • 0.00727 sec-1
  • 0.000727 sec-1
  • 0.0000727 sec-1
  • 0.00000727 sec-1
  • None of the above
Answer: 0.0000727 sec-1
Q2 | The torque of 50 Nm is applied on the wheel operating a valve. If the wheel is rotated through two revolutions, work done in Newton-metres is given by
  • 628
  • 107 dynes
  • 314
  • 25
  • 100
Answer: 628
Q3 | In a single threaded worm and worm wheel the number of teeth on the worm wheel is 80. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be
  • 60
  • 45
  • 120
  • 107 dynes
  • 90
Answer: 120
Q4 | A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tension is 36,000 kg the required length of cable is
  • 63.3 mets
  • 62.5 mts
  • 60.8 mts
  • 107 dynes
  • 60.1 mts
Answer: 60.1 mts
Q5 | For a self locking lifting machine, the efficiency must be
  • 50 percent
  • 100 percent
  • more than 50 percent
  • 107 dynes
  • less than 50 percent
Answer: less than 50 percent
Q6 | The periodic time of a body moving in Simple Harmonic Motion is
  • Directly proportional to its angular velocity
  • Directly proportional to the weight of the body
  • Inversely proportional to the square of angular velocity
  • Directly proportional to the momentum of swinging body
  • Inversely proportional to the angular velocity
Answer: Inversely proportional to the angular velocity
Q7 | A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be
  • 1500
  • 3000
  • 1000
  • 250
  • 500
Answer: 250
Q8 | A satellite orbits around the earth due to
  • Celestial force
  • Gravitational force
  • Centrifugal force
  • Centripetal force
  • All of the above
Answer: Centrifugal force
Q9 | A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s?
  • 3
  • 107 dynes
  • 5
  • 6
  • 7
Answer: 3
Q10 | The resultant of a force acting on a body will be zero, if the body
  • Rotates with uniform acceleration
  • Moves along a curved path
  • Rotates
  • Does not rotate
  • Rotates with uniform deceleration
Answer: Does not rotate
Q11 | What will be the duration of day and night if the earth shrinks to half the present radius?
  • 6 hours
  • 12 hours
  • 107 dynes
  • 3 hours
  • 24 hours
Answer: 6 hours
Q12 | If you want to stop the car in the shortest distance on an icy road, you should
  • 107 dynes
  • not apply the brakes
  • pump' the brakes
  • push hard the brakes to lock the wheels
  • push just hard enough to prevent slipping
Answer: push just hard enough to prevent slipping
Q13 | A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is
  • 500 KJ
  • 50.96 KJ
  • 101.92 KJ
  • None of the above
  • Tapered bearing
Answer: 500 KJ
Q14 | The shape of a suspended cable under its own weight is
  • Catenary
  • Elliptical
  • Cycloidal
  • Semi-circle
  • Parabolic
Answer: Catenary
Q15 | TIES : STRUTS :
  • purlins : piers
  • angle : tee
  • rolle support : hinge
  • compression : tension
  • 107 dynes
Answer: compression : tension
Q16 | The angle which an inclined surface makes with the horizontal when a body placed on it is on the point moving down is known as
  • Angle of friction
  • Angle of limiting friction
  • Angle of inclination
  • Angle of repose
  • None of the above
Answer: Angle of repose
Q17 | The radius of gyration of a solid sphere of radius r is equal to
  • 0.8 r2
  • 0.2 r2
  • 0.3 r2
  • 0.4 r2
  • 0.5 r2
Answer: 0.4 r2
Q18 | Ice is slippery when a man walks on it because
  • Increase of pressure causes it to melt
  • Ice is brittle
  • There is no friction
  • It is very chill
  • Its surface is smooth
Answer: Increase of pressure causes it to melt
Q19 | The mass, in kg, of the earth if its radius is 6400 km, will be
  • 6 x 1024
  • 6 x 1025
  • 107 dynes
  • 6 x 1023
  • 6 x 1022
Answer: 6 x 1024
Q20 | In a single threaded worm and worm wheel the number of teeth on the worm wheel is 60. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be
  • 90
  • 120
  • 60
  • 45
  • 107 dynes
Answer: 90
Q21 | A particle of mass M moves towards right with a velocity 2 V along the x-axis and another of mass 2 M with a velocity V towards left (- x axis). After the collision (they stick together on colliging) they will
  • come to rest
  • 107 dynes
  • move towards right
  • may move in any direction
  • move towards left
Answer: move towards right
Q22 | A cannon of weight 10 tonnes fires a shell of 50 kg with a muzzle velocity of 900 m/sec at an angle of 30?. The time taken for the shell to emerge from the barrel is 0.004 sec. The velocity of the cannon would be
  • 3.9 m/sec
  • 7.8 m/sec
  • 8.95 m/sec
  • 1.95 m/sec
  • 5.85 m/sec
Answer: 3.9 m/sec
Q23 | A car is travelling at 90 km/hour on a rough road where the coefficient of friction between the road and the tyre is 0.5. The distance the car will skid before stopping when the brakes are jammed suddenly would be
  • 127.4 m
  • 95.55 m
  • 63.7 m
  • 31.85 m
  • 90 m
Answer: 63.7 m
Q24 | One newton is equal to
  • 106 dynes
  • 105 dynes
  • 104 dynes
  • 103 dynes
  • 107 dynes
Answer: 105 dynes
Q25 | In the third system of pulleys, if there are n number of pulleys then the velocity ratio of the system will be
  • 2n - 2
  • n
  • 107 dynes
  • 2n-1
  • 2n
Answer: 2n-1
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