Applied Mechanics (1-10)

The forces which meet at one point but their lines of action do not lie in one plane, are called

A.	Coplanar concurrent forces	B.	Coplanar noncurrent forces
C.	Non-coplanar nonconcurrent forces	D.	Intersecting forces

Answer & Explanation

Answer: Option C

Explanation:

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The centre of percussions is

A.	The same as centre of gravity	B.	The point in a body about which it can rotate horizontally and oscillates under the influence of gravity
C.	The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis	D.	The point of application of the resultant of gravity and buoyancy forces of the body
E.	The metacentre of the body

Answer & Explanation

Answer: Option C

Explanation:

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A number of forces acting at a point will be in equilibrium if

A.	Sum of the forces is zero	B.	Algebraic sum of the forces is zero
C.	Sum of the resolved parts in any two perpendicular directions are both zero	D.	None of the above

Answer & Explanation

Answer: Option D

Explanation:

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Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be

A.	10	B.	28
C.	41	D.	14
E.	100

Answer & Explanation

Answer: Option A

Explanation:

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A particle is moving in Simple Harmonic Motion in a simple pendulum with some period of oscillation. Now in order to double the period of oscillation

A.	The mass of the bob should be doubled	B.	The mass of the bob should be halved
C.	The length of pendulum should be doubled	D.	The length of pendulum should be quadrupled
E.	The length of pendulum should be reduced to one fourth

Answer & Explanation

Answer: Option D

Explanation:

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The length of Seconds Pendulum is

A.	1000 mm	B.	999 mm
C.	995 mm	D.	994 mm
E.	992 mm

Answer & Explanation

Answer: Option D

Explanation:

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A clock with a second pendulum is gaining 5 minutes a day. To correct it

A.	The length of the pendulum should be increased	B.	The length of the pendulum should be decreased
C.	The length of pendulum should not be changed	D.	The eccentricity of bon with pendulum should be increased
E.	The eccentricity of bob with pendulum should be decreased

Answer & Explanation

Answer: Option A

Explanation:

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The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is

A.	16.32 m/sec	B.	8.16 m/sec
C.	5.88 m/sec	D.	8.88 m/sec
E.	Zero

Answer & Explanation

Answer: Option E

Explanation:

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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 & Explanation

Answer: Option A

Explanation:

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10.

The angle of projection when the range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection will be

A.	22	B.	30?
C.	45?	D.	15?
E.	90?

Answer & Explanation

Answer: Option D

Explanation:

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Applied Mechanics (1-10)

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