Elasticity MCQ with Answers

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

Answer is:

10 kg /mm²

22) 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?

Answer is:

0.0001786

23) 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?

Answer is:

0.01

24) 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?

Answer is:

12500 kg/mm²

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

Answer is:

7

Explanation:

The ratio of ultimate stress to the working stress is known as factor of safety. Its value is more than one.

Factor of Safety = Ultimate Stress/Working Stress

Working Stress = Ultimate Stress/Factor of Safety
Working Stress = 35/5 = 7 kg/mm²

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

10 kg /mm2

22) 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?

0.0001786

23) 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?

0.01

24) 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?

12500 kg/mm2

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

7

10 kg /mm²

12500 kg/mm²

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