1st Year Physics Chapter 7 Test07. Deformation of Solids

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Work done from force-extension graph is equal to
   1. slope of graph
   2. perimeter of graph
   3. area under graph
   4. maximum height
2. Polycrystalline solids consist of
   1. one large crystal
   2. many small crystals with random orientation
   3. fluid layers
   4. only amorphous particles
3. Crystalline solids have
   1. sharp melting point
   2. broad melting range
   3. no melting point
   4. variable melting behaviour
4. Body-centred cubic (BCC) unit cell contains atoms at
   1. only corners
   2. only centre
   3. corners and centre
   4. face centres
5. Crystalline solids have particles arranged in a
   1. random pattern
   2. fluid-like arrangement
   3. irregular arrangement
   4. regular
6. Elastic modulus is defined as:
   1. Stress × strain
   2. Stress ÷ strain
   3. Strain ÷ stress
   4. Force ÷ area
7. Point A on the stress-strain curve represents:
   1. Elastic limit
   2. Ultimate stress
   3. Breaking point
   4. Proportional limit
8. The highest stress a material can withstand is called:
   1. Breaking stress
   2. Yield stress
   3. Ultimate tensile strength
   4. Shear stress
9. Young's modulus relates:
   1. Tensile stress and tensile strain
   2. Shear stress and shear strain
   3. Volume stress and volume strain
   4. Hardness and brittleness
10. The point at which permanent deformation begins is:
    1. Proportional limit
    2. Elastic limit
    3. Yield point
    4. Breaking point