Question # 1

The maximum stress a solid material can sustain with out undergoing permanent deformation is called.

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elastic limit

Plastic

elastic deformation

Plastic deformation

A wire stretches 8 mm under a load of 60 N A second wire of the same material with half the diameter and a quarter of the original length of the first wire, is stretched by the same load What is the extension of the wire.

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1 mm

4 mm

8 mm

16 mm

The word fluid means

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To rise

To fall

To flow

To oppose

The SI unit of modulus of elasticity us

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N m-2

N m-1

N m

N m -3

If a body retains completely its altered shape and size, it is said to be

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Perfecto elasticity

Perfect plasticity

Elasticity

elastic limit

A small and a large rain drops are falling thgouth all.

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Large drop falls faster

Both move with same velocity

Small drop falls faster

Small drop does not fall

Soap cleans the dirty clothes because.

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Its chemical constituents are changed

Itr increases the surface tension of its solution with water

It increases the surface tension of its solution with water

It is less dense than that of water

A liquid surface tend to contract this phenomenon is due to

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Viscosity

Diffusion

Density

surface tension

The change in the dimensions of a body produced by the action of the deformation force is known as.

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Strain

Stress

Tensile strain

Tensile stress

A bodybuilders uses a chest expander with five springs it takes a force of 20 N to Pallone spring out by 15 cm how much force will be needed to extend the expander by 15 cm.

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50 N

75 N

150 N

1000 N

A force of 10 N acting on a certain spring produces an extension of 40 mm Two such spring are connected end to end and this double length spring is extended by 40 mm What is the strain energy.

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0.05 J

0.10 J

0.20 J

0.40 J

A tin film of liquid is enclosed between two glass plates it is difficult to spates the plates on account of.

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Surface tension

Atmospheric pressure

Viscosity

Friction

When the deforming force applied on a body produces change in length then it is said to be

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Tensile stress

compression stress

Shear stress

Shear modulus

The lowest stress at which strain increases in stress in called.

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elastic limit

Plastic limit

Yield point

Bulk strength

The force that moves a rocket or a plane forward is called.

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Lift

drag

Thrust

Turbulence

When a tennis balls is hit by a racket inasmuch a way that it spins as well as moves forward the velocity of the air on one side of the ball

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Increases

Decreases

Remain constant

Become zero

Rate of flow of a liquid is expressed in

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Litre m-3

Litre s-1

Litre m-1

Litre s

Which of the following is mechanical property of a material.

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Strength

Stiffness

Ductility

All of these

The Pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

The velocity at which laminar flow changes to turbulent flow is called.

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Terminal velocity

Escape velocity

Critical velocity

Uniform velocity

Which of the following has maximum viscosity.

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Oxygen

Mercury

Water

Glycerine

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