Applied Mechanics and Graphic Statics

311. To avoid bending action at the base of a pier,

1. Suspension and anchor cables are kept at the same level
2. Suspension and anchor cables are fixed to pier top
3. Suspension cable and anchor cables are attached to a saddle mounted on rollers on top of the pier
4. None the these

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312. To double the period of oscillation of a simple pendulum

1. The mass of its bob should be doubled
2. The mass of its bob should be quadrupled
3. Its length should be quadrupled
4. Its length should be doubled

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313. Total no of instantaneous centres of a machine having links, is

1. n/2
2. n
3. (n - 1)
4. n (n - 1)/2

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314. Two balls of masses 3 kg and 6 kg are moving with velocities of 4 m/sec and 1 m/sec respectively, towards each other along the line of their centers. After impact the 3 kg ball comes to rest. This can happen only if the coefficient of restitution between the balls is

1. 43526
2. 43586
3. 43588
4. 43525

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315. Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis?

1. Disc with larger density
2. Disc with smaller density
3. Both discs will have same rotational inertia
4. None of the above

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316. Two forces act an angle of 120°. If the greater force is 50 kg and their resultant is perpendicular to the smaller force, the smaller force is

1. 20 kg
2. 25 kg
3. 30 kg
4. 35 kg

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317. Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of

1. 5 Newtons
2. 8 Newtons
3. 10 Newtons
4. 12 Newtons

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318. Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are

1. 2 m/sec and 2 m/sec
2. 3 m/sec and 2 m/sec
3. 3 m/sec and 3 m/sec
4. 4 m/sec and 6 m/sec

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319. Two parallel forces 20 kg and 15 kg act. In order that the distance of the resultant from 20 kg force may be the same as that of the former resultant was from 15 kg, the 20 kg force is diminished by

1. 5.5 kg
2. 6.25 kg
3. 8.75 kg
4. 10.5 kg

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320. Two particles have been projected at angles 64° and 45° to the horizontal. If the velocity of projection of first is 10 m/sec, the velocity of projection of the other for equal horizontal ranges is

1. 9.3 m/sec
2. 8.3 m/sec
3. 7.3 m/sec
4. 6.3 m/sec

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