In a cubic unit cell of bcc structure, the lattic points (i.e., n

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 Multiple Choice QuestionsMultiple Choice Questions

31.

A work of 2 x 10-2 J is done on a wire of length 50 cm and area of cross-section 0.5 mm2. If the Young's modulus of the matenal of the wire is 2 × 1010 Nm-2, then the wire must be

  • elongated to 50.1414 cm

  • contracted by 2.0 mm

  • stretched by 0.707 mm

  • of length changed to 49.293 cm


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32.

In a cubic unit cell of bcc structure, the lattic points (i.e., number of atoms) are

  • 2

  • 6

  • 8

  • 12


A.

2

Number of lattice points in a crystal structure will be

      n = NC8 + NF2 + NI1

In bcc crystal, NC = 8 , NF = 0 and N= 1

      n = 88 + 01 + 11 = 2


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33.

The modulus of elasticity is dimensionally equivalent to

  • strain

  • force

  • stress

  • coefficient of viscosity


34.

A wire of length L and area of cross-section A is stretched through a distance x metre by applying a force F along length, then the work done in this process is : (Y is Young's modulus of the material)

  • 12 A . L YxL xL

  • A . L YL xL

  • 2 A . L YL xL

  • 3 A . L YL xL


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35.

A uniform plank of Young's modulus Y is moved over a smooth horizontal surface by a constant horizontal force F. The area of cross-section of the plank is A. The compressive strain on the plank in the direction of the force is

  • FAY

  • 2FAY

  • 12FAY

  • 3FAY


36.

Young's modulus of perfectly rigid body material is

  • infinite

  • zero

  • 10 × 1010 / m2

  • 1 × 1010 N/m2


37.

Which one of the following is not a unit of Young's modulus?

  • Nm-1

  • Nm-2

  • dyne cm-2

  • Mega pascal


38.

Which of the following substances has the highest elasticity ?

  • Sponge

  • Steel

  • Rubber

  • Copper


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39.

The following four wires of length L and radius r are made of the same material. Which of these will have the largest extension,when the same tension is applied ?

  • L = 1000 cm, r = 0.2 mm

  • L = 2000 cm, r = 0.4 mm

  • L = 3000 cm, r = 0.6 mm

  • L = 4000 cm, r = 0.8 mm


40.

The ratio of hydraulic stress to the corresponding strain is known as

  • Young's modulus

  • compressibility

  • Rigidity modulus

  • Bulk's modulus


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