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Q. The centre of percussions is

(A) The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis
(B) Difference of their initial velocities
(C) Average of their initial velocities
(D) None of the above

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Q. Plastic collosion of two bodies of equal mass results in a common velocity after impact which is

(A) Sum of their initial velocities
(B) In lowering a weight of 100 kg along an a inclined plane at an angle of 45? with
(C) In lifting up a weight of 100 kg at a constant speed of 3 m/sec
(D) In lowering the weight at a constant speed of 3 m/sec

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Q. In which case power required would be more

(A) In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec
(B) 107 dynes
(C) 2 N
(D) 6 N

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Q. In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be

(A) 21 N
(B) 246
(C) 192
(D) 166

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Q. A boy and his dad put a rope around a tree and stand side by side. What force by the boy can resist a force of 800 N by the dad?

(A) 231
(B) The algebraic sum of vertical components of all forces must be zero
(C) The algebraic sum of forces about a point must be zero
(D) All the above

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Q. The necessary condition of equilibrium of a body is

(A) The algebraic sum of horizontal components of all forces must be zero
(B) 18 m/s2
(C) 36 m/s2
(D) 9 m/s2

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Q. The displacement of a particle under going rectilinear motion along the x-axis is given by x = 2t3 + 21t2 + 60t + 6 metres.

(A) 27 m/s2
(B) 12i - 3j + k
(C) 16i - 12j - 6k
(D) 4i - 3j + k

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Q. A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m units would be

(A) 8i - 6j - 3k
(B) Kinetic energy at the ground
(C) Momentum at the ground
(D) Velocity while touching the ground

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Q. A block slides down a smooth inclined plane when released from the top while another falls freely from the same point. The value of which parameter in the two cases will be identical?

(A) Time taken to reach the ground
(B) 0.98 ft
(C) 2.73 ft
(D) 1.87 ft

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Q. The sag in a tape 100 ft long held between two supports 99.8 ft aprat at the same level is

(A) 3.32 ft
(B) Sink
(C) Float for sometime and then sink
(D) Float with 3/4 of volume above the liquid surface

Applied Mechanics MCQs with answers Page - 47

Q. The centre of percussions is

Q. Plastic collosion of two bodies of equal mass results in a common velocity after impact which is

Q. In which case power required would be more

Q. In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be

Q. A boy and his dad put a rope around a tree and stand side by side. What force by the boy can resist a force of 800 N by the dad?

Q. The necessary condition of equilibrium of a body is

Q. The displacement of a particle under going rectilinear motion along the x-axis is given by x = 2t3 + 21t2 + 60t + 6 metres.

Q. A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m units would be

Q. A block slides down a smooth inclined plane when released from the top while another falls freely from the same point. The value of which parameter in the two cases will be identical?

Q. The sag in a tape 100 ft long held between two supports 99.8 ft aprat at the same level is

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