Q. 26 Strain may be defined as

1. a) Internal resistance offered by the material against the load
2. b) Deformation caused in a material per unit of the original area
3. c) Deformation caused in a material per unit of original length
4. d) None of the above

Q. 27 A material is said to enter into its plastic state when the stress induced in it exceeds

1. a) Ultimate stress
2. b) Stress at proportional limit
3. c) Stress at lower yield point
4. d) Stress at elastic limit

Q. 28 Longitudinal stress means

1. a) Tensile stress
2. b) Compressive stress
3. c) Both a & b
4. d) Neither a nor b

Q. 29 Hooke’s Law is applicable upto

1. Breaking point
2. Proportional limit
3. Elastic limit
4. Yield Point

Q. 30 Breaking stress is

1. Greater than ultimate stress
2. Equal to ultimate stress
3. Less than ultimate stress
4. Of no importance in a stress-strain graph

Q. 31 Modulus of rigidity is the ratio of

1. a) Shear stress and shear strain
2. b) Tensile stress and tensile strain
3. c) Direct stress and volumetric strain
4. d) None of the above

Q. 32 Lateral strain is normally

1. a) Greater than longitudinal strain
2. b) Equal to longitudinal strain
3. c) Less than longitudinal strain
4. d) Both a & b

Q. 33 Poisson’s ratio is defined as the ratio of

1. a) Longitudinal strain and lateral strain
2. b) Lateral strain and longitudinal strain
3. c) Lateral strain and temperature strain
4. d) Elastic limit stress and yield point stress

Q. 34 The following is a probable value of Poisson’s ratio in a metal

a) 0.26 b) 0.1 c) 1 d) 4

Q. 35 Temperature stresses are set up in a material when

1. a) It is free to expand or contract
2. b) Its expansion or contraction is prevented
3. c) It is first heated and then cooled
4. c) It is first cooled and then heated

Give the answer to the question from the figure:-

Q. 36. In a stress-strain diagram for mild steel, as shown in fig, point A represents

1. a) elastic limit
2. b) upper yield point
3. c) steel and concrete both
4. d) breaking point

Q. 37. The stress is proportional to strain, for the portion

1. a) from O to A
2. b) from A to C
3. c) from A to D
4. d) from D to E

Q. 38. In fig, the stress corresponding to point D is

1. a) yield point stress
2. b) braking stress
3. c) ultimate stress
4. d) elastic limit

Q. 39. In fig, Hook’s law holds good, for the portion from O to A

1. a) from O to A b) from A to C c) from A to D d) from D to E

Q. 40. The breaking stress is …………….. the ultimate stress.

1. a) equal
2. b) less than
3. c) more than

Q. 41. When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed. (Agree/Disagree)

Agree

Q. 42. The ratio of the largest load in a test to the original cross-sectional area of the test piece is called

1. a) elastic limit
2. b) yield stress
3. c) ultimate stress
4. d) breaking stress

Give in the Answer in True False

Q.43. The tensile test carried on ductile material (True)

Q. 44. The compression test is carried on brittle material. (True)

Q.45. The tensile strength of ductile material is greater than its compressive strength. (True)

Q. 46. The compressive strength of brittle material is greater than its tensile strenght. (True)

Q.47. The ductility of a material increase with the increase in percentage reduction in area of specimen under tensile test. (True)

Q. 48. The ductility of the material decrease with the decrease in percentage elongation of a specimen under tensile test. (True)

Q. 49. Factor of safety is defined as the ratio of ultimate stress to working stress. (True)

Q. 50.The factor of safety is always more than unity. (True)