The ratio of limiting friction and normal reaction is known as

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The ratio of limiting friction and normal reaction is known as

A. Coefficient of friction

B. Angle of friction

C. Angle of repose

D. Sliding friction

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The centre of gravity of a uniform lamina lies at

A. The centre of heavy portion

B. The bottom surface

C. The midpoint of its axis

D. All of the above

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The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

A. πN/60

B. πN/180

C. 2πN/60

D. 2πN/180

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The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

A. a = α/ r

B. a = α.r

C. a = r / α

D. None of these

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Center of percussion is

A. The point of C.G.

B. The point of metacenter

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

D. Point of suspension

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The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

A. Equal to

B. Less than

C. Greater than

D. None of these

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A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is

A. 0°

B. 30°

C. 45°

D. 60°

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Forces are called concurrent when their lines of action meet in

A. One point

B. Two points

C. Plane

D. Perpendicular planes

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The friction experienced by a body, when in motion, is known as

A. Rolling friction

B. Dynamic friction

C. Limiting friction

D. Static friction

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A screw jack used for lifting the loads is

A. A reversible machine

B. A non-reversible machine

C. An ideal machine

D. None of these

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Coefficient of friction is the

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

B. Ratio of limiting friction and normal reaction

C. The friction force acting when the body is just about to move

D. The friction force acting when the body is in motion

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The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

A. r/2

B. 2r/3

C. r/A

D. 3r/2

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For any system of coplanar forces, the condition of equilibrium is that the

A. Algebraic sum of the horizontal components of all the forces should be zero

B. Algebraic sum of the vertical components of all the forces should be zero

C. Algebraic sum of moments of all the forces about any point should be zero

D. All of the above

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

A. Coplanar non-concurrent forces

B. Non-coplanar concurrent forces

C. Non-coplanar non-concurrent forces

D. Intersecting forces

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If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

A. Meet in a point

B. Be all parallel

C. At least two of them must meet

D. All the above are correct

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Effect of a force on a body depends upon

A. Magnitude

B. Direction

C. Position or line of action

D. All of the above

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The resultant of two forces P and Q acting at an angle θ is

A. √(P² + Q² + 2PQ sinθ)

B. √(P² + Q² + 2PQ cosθ)

C. √(P² + Q² - 2PQ cosθ)

D. √(P² + Q² - 2PQ tanθ)

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Coplanar concurrent forces are those forces which

A. Meet at one point, but their lines of action do not lie on the same plane

B. Do not meet at one point and their lines of action do not lie on the same plane

C. Meet at one point and their lines of action also lie on the same plane

D. Do not meet at one point, but their lines of action lie on the same plane

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The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

A. 50 mm

B. 75 mm

C. 87.5 mm

D. 125 mm

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A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

A. Reversible

B. Non-reversible

C. Ideal

D. None of these

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If two bodies having masses m₁ and m₂ (m₁>m₂) have equal kinetic energies, the momentum of body having mass m₁ is _________ the momentum of body having mass m₂.

A. Equal to

B. Less than

C. Greater than

D. None of these

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Lami's theorem states that

A. Three forces acting at a point will be in equilibrium

B. Three forces acting at a point can be represented by a triangle, each side being proportional to force

C. If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

D. If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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The coefficient of restitution for inelastic bodies is

A. Zero

B. One

C. Between zero and one

D. More than one

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The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

A. mr²/2

B. mr²/4

C. mr²/6

D. mr²/8

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The maximum frictional force which comes into play when a body just begins to slide over another surface is called

A. Limiting friction

B. Sliding friction

C. Rolling friction

D. Kinematic friction

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The moment of inertia of a square of side (a) about an axis through its centre of gravity is

A. a⁴/4

B. a⁴/8

C. a⁴/12

D. a⁴/36

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The friction experienced by a body, when at rest, is known as

A. Static friction

B. Dynamic friction

C. Limiting friction

D. Coefficient of friction

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The unit of force in S.I. system of units is

A. Dyne

B. Kilogram

C. Newton

D. Watt

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The centre of gravity of a semi-circle lies at a distance of __________ from its base measured along the vertical radius.

A. 3r/ 8

B. 4r/ 3π

C. 8r/3

D. 3r/4π

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If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be

A. Same

B. Half

C. Double

D. None of these

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The velocity ratio of a first system of pulleys with 4 pulleys is

A. 4

B. 8

C. 16

D. 20

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Accepted Answer

A. Coefficient of friction

The ratio of limiting friction and normal reaction is known as

Correct Answer :

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The ratio of limiting friction and normal reaction is known as

Correct Answer :

Show all Engineering Mechanics MCQ

Related Questions

The centre of gravity of a uniform lamina lies at

The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad/s2, is

Center of percussion is

The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is

Forces are called concurrent when their lines of action meet in

The friction experienced by a body, when in motion, is known as

A screw jack used for lifting the loads is

Coefficient of friction is the

The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

For any system of coplanar forces, the condition of equilibrium is that the

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

If three forces acting in one plane upon a rigid body, keep it in equilibrium, then they must either

Effect of a force on a body depends upon

The resultant of two forces P and Q acting at an angle θ is

Coplanar concurrent forces are those forces which

The centre of gravity a T-section 100 mm × 150 mm × 50 mm from its bottom is

A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is

If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is _________ the momentum of body having mass m2.

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The coefficient of restitution for inelastic bodies is

The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

The maximum frictional force which comes into play when a body just begins to slide over another surface is called

The moment of inertia of a square of side (a) about an axis through its centre of gravity is

The friction experienced by a body, when at rest, is known as

The unit of force in S.I. system of units is

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