Applied Mechanics And Graphic Statics MCQ Questions & Answers

71

The dimensions of power are

A) M²L²T^-2 B) ML²T^-3 C) M²LT^-2 D) MLT^-2

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Answer & Solution

Answer: Option B

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72

The Law of Polygon of Forces states that

A) If a polygon representing the forces acting at point in a body is closed, the forces are in equilibrium B) If forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by t C) If forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side D) If forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium

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Answer & Solution

Answer: Option C

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73

A cube on a smooth horizontal surface

A) Cannot be in stable equilibrium B) Cannot be in neutral equilibrium C) Cannot be in unstable equilibrium D) Can be in any of these states

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Answer & Solution

Answer: Option D

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74

The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through

A) 0.02 m B) 2 m C) 2.5 m D) 20 m

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Answer & Solution

Answer: Option A

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75

The rate of change of displacement of a body with respect to its surrounding, is known

A) Velocity B) Acceleration C) Speed D) None of these

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Answer & Solution

Answer: Option A

Solution:

Displacement refers to the change in position of a body in a particular direction.

The rate of change of displacement with respect to time is defined as velocity.

Velocity is a vector quantity, meaning it has both magnitude and direction.

In contrast, speed is the rate of change of distance (not displacement) and is a scalar quantity.

Acceleration is the rate of change of velocity, not displacement.

Therefore, the correct term for the rate of change of displacement is Velocity.

76

A train weighing 196 tonnes experiences a frictional resistance of $$5\frac{{11}}{{22}}$$ per tonne. The speed of the train at the top of a down gradient 1 in 78.4 is 36 km/hour. The speed of the train after running 1 km down the slope, is

A) $$5\sqrt {10} {\text{ m/sec}}$$ B) $$10\sqrt 5 {\text{ m/sec}}$$ C) $$5\sqrt 3 {\text{ m/sec}}$$ D) $$3\sqrt 5 {\text{ m/sec}}$$

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Answer & Solution

Answer: Option A

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77

A trolley wire weighs 1 kg per metre length. The ends of the wire are attached to two poles 20 m apart. If the horizontal tension is 1000 kg, the central dip of the cable is

A) 2 cm B) 3 cm C) 4 cm D) 5 cm

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Answer & Solution

Answer: Option D

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78

A particle moves along a straight line such that distance ‘x’ traversed in ‘t’ seconds is given by x = t²(t + 1), the acceleration of the particle, will be

A) 3t³ - 2t B) 3t² + 2t C) 6t - 2 D) 6t + 2 E) 3t - 2

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Answer & Solution

Answer: Option D

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79

A Seconds pendulum executes

A) 0.5 beat per second B) 1.0 beat per second C) 2.0 beats per second D) 2.5 beats per second

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Answer & Solution

Answer: Option B

Solution:

The correct answer is Option B: 1.0 beat per second
Here's why:
A seconds pendulum is defined as a pendulum that takes exactly one second to swing in one direction.
This means it takes one second to complete half of its full swing (from one extreme point to the other).
A "beat" refers to one such swing.
Since it takes 1 second for one beat, it means it has 1.0 beat per second.

80

The forces which meet at one point and have their lines of action in different planes are called

A) Coplanar non-concurrent forces B) Non-coplanar concurrent forces C) Non-coplanar non-current forces D) Intersecting forces

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Answer & Solution

Answer: Option B

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Applied Mechanics And Graphic Statics MCQ Questions & Answers | Civil Engineering