Engineering Materials Objective Questions with Answers - Set 06 - ObjectiveBooks

Engineering Materials Objective Questions with Answers - Set 06

Practice Test: Question Set - 06

1. The material in which the atoms are arranged chaotically, is called
    (A) Amorphous material
    (B) Mesomorphous material
    (C) Crystalline material
    (D) None of these

2. The percentage of carbon in pig iron varies from
    (A) 0.1 to 1.2%
    (B) 1.5 to 2.5%
    (C) 2.5 to 4%
    (D) 4 to 4.5%

3. Crystal structure of a material is, generally, examined by
    (A) Naked eye
    (B) Optical microscope
    (C) Metallurgical microscope
    (D) X-ray techniques

4. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
    (A) Molecular change
    (B) Physical change
    (C) Allotropic change
    (D) Solidus change

5. An eutectoid steel consists of
    (A) Wholly pearlite
    (B) Wholly austenite
    (C) Pearlite and ferrite
    (D) Pearlite and cementite

6. Ductility of a material can be defined as
    (A) Ability to undergo large permanent deformations in compression
    (B) Ability to recover its original form
    (C) Ability to undergo large permanent deformations in tension
    (D) All of the above

7. Which of the following property is desirable in parts subjected to shock and impact loads?
    (A) Strength
    (B) Stiffness
    (C) Brittleness
    (D) Toughness

8. In compression, a prism of brittle material will break
    (A) By forming a bulge
    (B) By shearing along oblique plane
    (C) In direction perpendicular to application of load
    (D) By crushing into thousands of pieces

9. The main alloying elements high speed steel in order of increasing proportion are
    (A) Vanadium, chromium, tungsten
    (B) Tungsten, titanium, vanadium
    (C) Chromium, titanium, vanadium
    (D) Tungsten, chromium, titanium

10. Corundum contains more than 95%
    (A) Steel
    (B) Al2O3
    (C) SiO2
    (D) MgO

11. The aluminium alloy made by melting aluminium with 2 to 10% magnesium and 1.75% copper is called
    (A) Duralumin
    (B) Y-alloy
    (C) Magnalium
    (D) Hindalium

12. Brass contains
    (A) 70% copper and 30% zinc
    (B) 90% copper and 10% tin
    (C) 85 - 92% copper and rest tin with little lead and nickel
    (D) 70 - 75% copper and rest tin

13. There are fourteen atoms in a unit cell of
    (A) Body centered cubic space lattice
    (B) Face centered cubic space lattice
    (C) Close packed hexagonal space lattice
    (D) None of these

14. A specimen of aluminium metal when observed under microscope shows
    (A) B.C.C. crystalline structure
    (B) F.C.C. crystal structure
    (C) H.C.P. structure
    (D) A complex cubic structure

15. The defect which takes place due to imperfect packing of atoms during crystallization is known as
    (A) Line defect
    (B) Surface defect
    (C) Point defect
    (D) None of these

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