## Workshop Calculation and Science

#### 2nd Year

#### Module 5 - Elasticity

1: Which is elastic material?

A : Nylon

B : Polystyrenes

C : Celluloid

D : Polycarbonates

2: Which is thermo plastic material?

A : Butyl rubber

B : Nylon

C : Neoprene

D : Vinyl polymers

3: What is the maximum percentage of stretch of its original length is allowable for elastic materials?

A : 100%

B : 200%

C : 300%

D : 400%

4: What is the ratio between the change in dimension to its original dimension of the substance?

A : Stress

B : Strain

C : Poissonʹs ratio

D : Factor of safety

5: What is the unit of strain?

A : Kg/cm²

B : Newton/metre²

C : Metre

D : No unit

6: What is the ratio of change in length to original length?

A : Linear strain

B : Lateral strain

C : Volumetric strain

D : Poissonʹs ratio

7: What is the ratio between lateral strain and longitudinal strain?

A : Hooks law

B : Youngʹs modulus

C : Bulk modulus

D : Poissonʹs ratio

8: Which symbol is used to express change in length?

A : L

B : ẟl

C : I

D : e

9: Which one is the ratio of stress?

A : Load and area

B : Load and direction

C : Load and diameter

D : Load and time

10: Which force acts on rivets?

A : Tensile force

B : Compressive force

C : Shear force

D : Bending force

11: Which type of stress?

A : Tensile stress

B : Compressive stress

C : Shear stress

D : Torsional stress

12: What is the formula for bulk modulus?

A : Tensile stress/Tensile strain

B : Compressive stress/Compressive strain

C : Volumetric stress/Volumetric strain

D : Shear stress/Shear strain

13: Which law states that within elastic limit stress is directly proportional to strain?

A : Newtons law

B : Hooks law

C : Joules law

D : Charles law

14: What is the name of the point ʹCʹ?

A : Yield point

B : Elastic limit

C : Ultimate load

D : Fracture

15: What is the term used for maximum stress attained by a material before rupture?

A : Tensile stress

B : Compressive stress

C : Working stress

D : Ultimate stress

16: What is the ratio between ultimate stress to working stress?

A : Bulk modulus

B : Youngʹs modulus

C : Factor of safety

D : Modulus of rigidity

17: What is the ratio of ultimate load to area of original cross section?

A : Factor of safety

B : Yield point

C : Ultimate stress

D : Youngs modulus

18: What does the point ʹbʹ denotes in the stress-strain graph?

A : Elastic limit

B : Yield point

C : Limit of proportionality

D : Ultimate load

19: What is the ratio of shear stress to shear strain?

A : Modulus of elasticity

B : Modulus of rigidity

C : Bulk modulus

D : Yield point

20: What is the ratio between stress and strain?

A : Yield point

B : Factor of safety

C : Youngs Modulus

D : Poissonʹs ratio

21: Which force acts on crank shaft?

A : Shear stress

B : Torsional stress

C : Tensile stress

D : Compressive stress

22: Which is thermosetting plastic?

A : Vinyl polymers

B : Polystyrenes

C : Celluloid

D : Melamine resins

23: What force will be required to punch a hole of 10 mm dia in a 1 mm thick plate, if the allowable shear stress is 50N/mm²? (π = 22/7)

A : 1757 N

B : 1575 N

C : 1571.4 N

D : 1577 N

24: What is the tensile stress if a square rod of 10 mm side is tested for a tensile load of 1000 kg?

A : 1 kg/mm²

B : 10 kg /mm²

C : 100 kg/mm²

D : 1000 kg/mm²

25: What is the tensile strain if a force of 3.2 KN is applied to a bar of original length 2800 mm extends the bar by 0.5 mm?

A : 0.0001786

B : 0.0001687

C : 0.0001867

D : 0.0001968

26: How much strain is developed in an iron rod of 1 metre length gets elongated by 1 cm, if a force of 100 kg is applied at one end?

A : 0.1

B : 0.01

C : 0.001

D : 0.0001

27: What is the youngs modulus if a wire of 2m long, 0.8 mm2 in cross section increases its length by 1.6 mm on suspension of 8 kg weight from it?

A : 1.25 kg/mm²

B : 12.5 kg /mm²

C : 125 kg/mm²

D : 12500 kg/mm²

28: What is the safe stress if the ultimate stress of a material is 35 kg/mm² and factor of safety is 5?

A : 0.143

B : 0.7

C : 1.43

D : 7

29: Which type of stress?

A : Tensile stress

B : Compressive stress

C : Shear stress

D : Torsional stress