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4

A material obeys hooks law up to

A. Plastic limit

B. Elastic limit

C. Yield point

D. Limit of proportionality

Correct Answer :

B. Elastic limit


Related Questions

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4

Strain is equal to (where l = Original length, and δl = Change in length)

A. l/δl

B. δl/l

C. l.δl

D. l + δl

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4

When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.

A.

B. 30°

C. 45°

D. 90°

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4

The value of modulus of elasticity for mild steel is of the order of

A. 2.1 × 10⁵ kg/cm²

B. 2.1 × 10⁶ kg/cm²

C. 2.1 × 10⁷ kg/cm²

D. 0.1 × 10⁶ kg/cm²

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4

One reversible heat engine operates between 1600 K and T2 K and another reversible heat engine operates between T2 K and 400 K. If both the engines have the same heat input and output, then temperature T2 is equal to

A. 800 K

B. 1000 K

C. 1200 K

D. 1400 K

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4

For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

A. p v = constant, if T is kept constant

B. v/T = constant, if p is kept constant

C. p/T = constant, if v is kept constant

D. T/p = constant, if v is kept constant

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4

The moment of resistance of a balanced reinforced concrete beam is based on the stresses in

A. Steel only

B. Concrete only

C. Steel and concrete both

D. None of these

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4

The intensity of stress which causes unit strain is called

A. Unit mass

B. Modulus of rigidity

C. Bulk modulus

D. Modulus of Elasticity

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4

Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.

A. 1/27th

B. 1/93th

C. 1/173th

D. 1/273th

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4

The temperature at which the volume of a gas becomes zero is called

A. Absolute scale of temperature

B. Absolute zero temperature

C. Absolute temperature

D. None of these

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4

The efficiency of Stirling cycle is __________ Carnot cycle.

A. Greater than

B. Less than

C. Equal to

D. None of these

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4

Second law of thermodynamics defines

A. Heat

B. Work

C. Internal energy

D. Entropy

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4

According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.

A. Equal to

B. Directly proportional to

C. Inversely proportional to

D. None of these

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4

In the torsion equation T/J = τ/r = Gθ/ L, the term J/R is called

A. Shear modulus

B. Section modulus

C. Polar modulus

D. None of these

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4

The section modulus of a circular section about an axis through its C.G., is

A. πd²/4

B. πd²/16

C. πd3/16

D. πd3/32

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4

Reversed Joule cycle is known as

A. Carnot cycle

B. Bell-Coleman cycle

C. Rankine cycle

D. Stirling cycle

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4

One kg of carbon monoxide requires 4/7 kg of oxygen and produces

A. 11/3 kg of carbon dioxide gas

B. 7/3 kg of carbon monoxide gas

C. 11/7 kg of carbon dioxide gas

D. 8/3 kg of carbon monoxide gas

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4

For a beam, as shown in the below figure, when the load W is applied in the centre of the beam, the maximum deflection is

A. Wl3 / 48EI

B. 5Wl3 / 384EI

C. Wl3 / 392EI

D. Wl3 / 384EI

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4

The shape of cantilever for uniformly distributed load will be

A. Straight line

B. Parabolic

C. Elliptical

D. Cubic

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4

According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature.

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

The state of a substance whose evaporation from its liquid state is complete, is known as

A. Vapour

B. Perfect gas

C. Air

D. Steam

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4

The compression ratio is the ratio of

A. Swept volume to total volume

B. Total volume to swept volume

C. Swept volume to clearance volume

D. Total volume to clearance volume

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4

The maximum tangential stress in a thick cylindrical shell is always _________ the internal pressure acting on the shell.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

When the expansion or compression takes place according to the law pvn = C, the process is known as

A. Isothermal process

B. Adiabatic process

C. Hyperbolic process

D. Polytropic process

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4

The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

A. Enthalpy

B. Internal energy

C. Entropy

D. External energy

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4

The value of shear stress which is induced in the shaft due to the applied couple varies

A. From maximum at the centre to zero at the circumference

B. From zero at the centre to maximum at the circumference

C. From maximum at the centre to minimum at the circumference

D. From minimum at the centre to maximum at the circumference

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4

The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of

A. One right angled triangle

B. Two right angled triangles

C. One equilateral triangle

D. Two equilateral triangles

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4

In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

A. Same as

B. Less than

C. Greater than

D. None of these

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4

Hooke's law holds good up to

A. Yield point

B. Limit of proportionality

C. Breaking point

D. Elastic limit

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4

The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is

A. Same

B. Double

C. Half

D. Four times

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4

The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

A. Q1 - 2 = dU + W1 - 2

B. Q1 - 2 = dU - W1 - 2

C. Q1 - 2 = dU/W1 - 2

D. Q1 - 2 = dU × W1 - 2