ELASTICITY - Quiz

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

1 kg/mm<sup>2</sup> 10 kg /mm<sup>2</sup> 100 kg/mm<sup>2</sup> 1000 kg/mm<sup>2</sup>

2) 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 0.0001687 0.0001867 0.0001968

3) 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?

0.1 0.01 0.001 0.0001

4) 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?

1.25 kg/mm<sup>2</sup> 12.5 kg /mm<sup>2</sup> 125 kg/mm<sup>2</sup> 12500 kg/mm<sup>2</sup>

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

0.143 0.7 1.43 7