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4

The ratio of static friction to dynamic friction is always

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

Correct Answer :

C. Greater than one


Related Questions

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4

In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.

A. Half

B. Equal to

C. Double

D. None of these

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4

The unit of work or energy in S.I. units is

A. Newton

B. Pascal

C. Watt

D. Joule

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4

A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

A. 2.5 cm

B. 3.0 cm

C. 4.0 cm

D. 5.0 cm

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4

The velocity ratio for the third system of pulleys is

A. n

B.

C. 2n

D. 2n - 1

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4

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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4

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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4

The ratio of static friction to dynamic friction is always

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

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4

A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.

A. Increase

B. Decrease

C. Not be effected

D. None of these

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4

The maximum velocity of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω2r

D. ω/r

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4

The maximum efficiency of a lifting machine is

A. 1/m

B. V.R./m

C. m/V.R.

D. 1/(m × V.R.)

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4

The centre of gravity of a triangle lies at the point of

A. Concurrence of the medians

B. Intersection of its altitudes

C. Intersection of bisector of angles

D. Intersection of diagonals

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4

The range of projectile on a downward inclined plane is ________ the range on upward inclined plane for the same velocity of projection and angle of projection.

A. Less than

B. More than

C. Equal to

D. None of These

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4

The forces, which meet at one point and their lines of action also lie on the same plane, are known as

A. Coplanar concurrent forces

B. Coplanar non-concurrent forces

C. Non-coplanar concurrent forces

D. Non-coplanar non-concurrent forces

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4

Kinetic friction is the

A. Tangent of 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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4

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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4

The maximum mechanical advantage of a lifting machine is

A. 1 + m

B. 1 - m

C. 1 / m

D. m

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4

Tangent of angle of friction is equal to

A. Kinetic friction

B. Limiting friction

C. Angle of repose

D. Coefficient of friction

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4

The wheels of a moving car possess

A. Potential energy only

B. Kinetic energy of translation only

C. Kinetic energy of rotation only

D. Kinetic energy of translation and rotation both

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4

The moment of the force P about O as shown in the below figure is

A. P × OA

B. P × OB

C. P × OC

D. P × AC

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4

Which of the following statement is correct in connection with projectiles?

A. A path, traced by a projectile in the space, is known as trajectory.

B. The velocity, with which a projectile is projected, is known as the velocity of projection.

C. The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

D. All of the above

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4

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

A. h/kG

B. h2/kG

C. kG2/h

D. h × kG

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4

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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4

In the equation of virtual work, following force is neglected

A. Reaction of any smooth surface with which the body is in contact

B. Reaction of a rough surface of a body which rolls on it without slipping

C. Reaction at a point or an axis, fixed in space, around which a body is constrained to turn

D. All of the above

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4

A pair of smith's tongs is an example of the lever of

A. Zeroth order

B. First order

C. Second order

D. Third order

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4

One watt is equal to

A. 0.1 joule/s

B. 1 joule/s

C. 10 joules/s

D. 100 joules/s

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4

The acceleration of a particle moving with simple harmonic motion, at any instant is given by

A. ω.y

B. ω2.y

C. ω2/y

D. ω3.y

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4

The velocity of a body on reaching the ground from a height h, is

A. 2.√(gh)

B. √(gh)

C. √(2gh)

D. 2g.√h

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4

The ideal angle of banking provided on the curves on roads depends upon

A. Weight of the vehicle

B. (Velocity)2 of the vehicle

C. Nature of the road surface

D. Coefficient of friction between the road and vehicle contact point

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4

The rate of doing work is known as

A. Potential energy

B. Kinetic energy

C. Power

D. None of these

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4

A smooth cylinder lying on its convex surface remains in __________ equilibrium.

A. Stable

B. Unstable

C. Neutral

D. None of these