Welcome to your Deformation of Solids - Hookes Law and Youngs Modulus(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. The yellow line indicates which of the following? Modulus of elasticity Pre-fracture stress load Strength of ductility 2. If the material recovers the original dimensions, when an external load is removed, this deformation is known as ______ deformation. elastic plastic irreversible permanent 3. The table shows how the extension of a spring varies with load. Between which two loads would you find the limit of proportionality? 0N and 2N 8N and 10N 10N and 12N 14N and 16N 4. The graph shows extension-load curves for four fibres. Which fibre is the hardest(most difficult) to stretch over the range of loads shown? A B C D 5. A steel spring is stretched by a load. The load is increased. At first the extension is proportional to the load. The spring reaches its limit of proportionality at L. Which is the correct graph of the extension against load for the spring? C B A D 6. The negative ratio between the lateral strain and the direct tensile strain is known as ______ True strain Engineering strain Elastic modulus Poisson’s ratio 7. An extension-load graph for a wire is shown. What is the load at the limit of proportionality for the wire? 70N 4N 15N 60N 8. Force applied on a unit area of a crystal is called Stress Flexibility elasticity strain 9. The graph shows the extension of a piece of copper wire as the load on it is increased. What does the graph show? The load and extension are inversely proportional for all loads. The load and extension are directly proportional for all loads. At a certain load the wire becomes harder to extend. At a certain load the wire becomes easier to extend. 10. Elastic modulus can’t be changed by ______ heat treatment by increasing section thickness alloying cold working 11. A spring balance is calibrated to give readings in newtons. The graph shows how the length of the spring varies with the load. A load causes the spring of the balance to extend by 3cm. What is the balance reading? 15N 3N 10N 5N 12. What is the reason for elastic deformation? Twinning Dislocations intersection Slip Displacement of atoms to a fraction interatomic distance 13. A 100 g mass is suspended from a spring next to a vertical metre rule. The top of the spring is level with the 0.0cm mark. The bottom of the spring is level with the 27.2cm mark. The 100g mass is replaced with a 600g mass. The length of the spring is now 89.7cm. The spring has not reached the limit of proportionality. The 600g mass is replaced with a 200g mass. What is the length of the spring? 29.9cm 39.7cm 33.4cm 54.4cm 14. A crystalline solid has an ordered structure only vibrational energy low KE Rotational energy 15. A solid having irregular arrangement of molecules is called crystalline polymeric ideal amorphous 16. Compressibility is reciprocal of _____ Elastic modulus Poisson’s ratio Shear modulus Bulk modulus 17. Molecules of a solid possess Rotatory motion Translational motion Polymeric structure Ideal arrangement 18. A spring extends by 6.0cm when a 15N weight is suspended from its lower end. Three of these springs are used as shown to support a 90N weight. What is the extension of each spring? 12cm 110cm 36cm 2.0cm 19. Which property of a body cannot be changed if a force is applied to it? Its velocity Its size Its mass Its shape 20. _____ is an anisotropic property of a crystal. Poisson's ratio Elastic modulus Damping Density 21. The diagram shows how the length of a spring changes when a load of 10N is hung on it. The 10N load is replaced by a 20N load. What is the new length of the spring? 6 cm 14cm 16cm 11cm 22. An extension-load graph is plotted to show the result of increasing the load on a spring. Which point marks the limit of proportionality for this spring? B A C D 23. What is atomic density on prismatic plane? 2/ac 1/a² 2/√3a² 2/a² 24. The Y axis is used to plot which of the following Strain Stress 25. Which part of the graph shows the limit of proportionality for an elastic solid? P O OP PQ 1 out of 25 Time is Up! Time's up