ENGINEERING MECHANICS QUIZ

When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is

0.5 mv2

0.5 mgv2

mgv2

mv2

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YOUR ANSWER : ?

The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Principle of conservation of momentum

Newton's first law of motion

Newton's second law of motion

Principle of conservation of energy

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The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is

h/(kG² + h²)

(kG² + h²)/h

h²/(kG² + h²)

(kG² + h²)/h²

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Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

15 N and 5 N

None of these

20 N and 5 N

15 N and 15 N

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The term 'Centroid' is

The same as centre of gravity

The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

None of the listed here

The point of suspension

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The units of moment of inertia of mass are

kg/m

kg/m²

m²/kg

kg-m²

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The mechanical advantage of a lifting machine is the ratio of

Output to the input

Load lifted to the effort applied

All of these

Distance moved by effort to the distance moved by load

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Angle of friction is the

The ratio of minimum friction force to friction force acting when the body is in motion

Ratio of limiting friction and normal reaction

Angle between normal reaction and the resultant of normal reaction and the limiting friction

The ratio of minimum friction force to the friction force acting when the body is just about to move

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The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW + C

P = m/W + C

P = C - mW

P = mW - C

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The resultant of the two forces ‘P’ and ‘Q’ is ‘R’. If ‘Q’ is doubled, the new resultant is perpendicular to ‘P’. Then

P = Q

Q = 2R

Q = R

None of the listed here

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