The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________________?

Related Mcqs:

1. Which of the following is not a characteristic observed in material failure by fatigue fracture ?

   A. Plastic deformation of material does not occur
   B. Initiation of crack from below the surface does not occur
   C. Initiation of crack occurs on the surface of the machine part
   D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the

2. Fibrous fracture is normally encountered in the ____________________ materials?

   A. Hard
   B. Elastic
   C. Ductile
   D. Brittle

3. The most serious manufacturing defect from fracture toughness point of view is____________________?

   A. Surface roughness
   B. Pores
   C. Spherical inclusion
   D. Crack

4. A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than _______________ percent ?

   A. 150
   B. 200
   C. 300
   D. 400

5. Gibbs free energy (F) is defined as__________________?

   A. F = E – TS
   B. F = H – TS
   C. F = H + TS
   D. F = E + TS

6. Joule-Thomson co-efficient is defined as__________________?

   A. μ = (∂P/∂T)H
   B. μ = (∂T/∂P)H
   C. μ = (∂E/∂T)H
   D. μ = (∂E/∂P)H

7. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as__________________?

   A. Solubility increases as temperature increases
   B. Solubility increases as temperature decreases
   C. Solubility is independent of temperature
   D. Solubility increases or decreases with temperature depending on the Gibbs free energy change
   of solution

8. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails ?

   A. Below the yield point
   B. Above the yield point
   C. Below the elastic limit
   D. At the elastic limit

9. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will____________________?

   A. Increase
   B. Decrease
   C. Remain unaffected
   D. May increase or decrease; depends on the thickness of each layer

10. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of______________?

    A. Fusion
    B. Vaporisation
    C. Transition
    D. None of these