Strength of Material

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Mock Test 2

1. Bulk modulus is

1 point

Ratio of direct stress and longitudinal strain

Ratio of direct stress and lateral strain

Ratio of direct stress and volumetric strain

none of these

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2. Young's modulus is

1 point

Ratio of direct stress and longitudinal strain

Ratio of direct stress and lateral strain

Ratio of direct stress and volumetric strain

none of these

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3. The relation between modulus of elasticity and modulus of rigidity is

1 point

E=2G(2+ μ)

E=2G(1+μ)

E=3G(1-2 μ)

E=2G(1- μ)

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4. The relation between Young’s modulus and bulk modulus is

1 point

E=3K(2-μ)

E=3K(1+2μ)

E=3K(1-2μ)

E=3K(1-μ)

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5. A metallic bar 300mm*100mm*40mm is subjected to a force of 5KN (tensile), 6KN (tensile) & 4KN (tensile) along x, y & z directions respectively. Determine the change in the volume of the block. Take E=2*10^5 N/mm^2 and Poisson’s ratio=0.25.

1 point

7.649 mm^3

6.649 mm^3

4.649 mm^3

5.649 mm^3

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6. A steel rod 5m long and 30mm in diameter is subjected to an axial tensile load of 50KN. Determine the change in length of the rod. Take E=2*10^5 N/mm^2 and Poisson’s ratio=0.25.

1 point

0.768mm

1.768mm

1.476mm

2.134mm

Clear selection

7. A bar of 30mm diameter is subjected to a pull of 60KN. The measured extension on gauge length of 200mm is 0.2mm and change in diameter is 0.004mm. Calculate the Young’s modulus in N/mm^2.

1 point

1.432*10^5

1.289*10^5

1.697*10^5

1.866*10^5

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8. Elongation of a bar due to its own weight is directly proportional of

1 point

L^2

L^3

Independent of length

Clear selection

9. Hook’s law states within

1 point

Plastic limit

Elastic limit

Proportional limit

Yield strength

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10. Stress is expressed as

1 point

kgf/cm^2

N/m^2

Both

None of these

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11. Determine the bulk modulus of a material, for which Young’s modulus is 1.2*10^5 N/mm^2 and modulus of rigidity is 4.8*10^4 N/mm^2.

1 point

6*10^4 N/mm^2

7*10^4 N/mm^2

8*10^4 N/mm^2

9*10^4 N/mm^2

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12. The pressure on the fluid is 3MPa. The Young's modulus is 210GPa and the Poisson's ratio is 0.25, the volumetric compressive strain produced is

1 point

21.42*10^-6

14.2*10^-6

35.7*10^-6

142*10^-6

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13. A brass bar having a cross-sectional area of 1000 mm^2 is subjected to axial forces as shown in the figure. Find the total change in length of the bar. [take E=1.05*10^5 N/mm^2]

1 point

0.1143mm

-0.1143mm

0.2354mm

-0.1654mm

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14. A tapers uniformly from 60mm to 30mm diameter in a length of 300mm. If the rod is subjected to an axial load of 6000N, then the extension of the rod______.[take E=2*10^5 N/mm^2]

1 point

5.15

7.44

6.37

7.52

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15. The ratio of elongation of a conical and rectangular bar of same length under its own weight is_____.

1 point

0.5

0.33

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16. Which material has highest value of Poisson's ratio?

1 point

Elastic Rubber

Wood

Copper

Steel

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17. The graph shows the character of ______.

1 point

Linear elastic body

Linear plastic body

linear elastic ideal plastic body

linear elastic strain hardening body

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18. A free bar of length L is uniformly heated from 0°C to a temperature of t°C, α is the coefficient of linear expansion and E the modulus of elasticity. The stress in the bar is?

1 point

αEt

αEtL

None of these

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19. A metal rod is rigidly fixed at its both ends. The temperature of the rod is increased by 100°C. If the coefficient of linear expansion and elastic modulus of the metal rod are 10*10^-6 /°C and 200 GPa respectively then, the stress produced in the rod is ____MPa.

1 point

100

2000

200

1000

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20. Thermal stress is independent of

1 point

Material

Temperature difference

Area

All of these

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