CBSE Class 11-Physics: Properties of Bulk Matter – Elasticity Practice Paper
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Section A
Instructions: -
All the questions are long answer type questions write the answers as if you are writing for 5 marks questions.
Question 1:
Explain the terms Stress, Strain and Young’s modulus. Derive a relation for Young’s modulus of elasticity.
Question 2:
State Hooke’s law. Define the terms Elastic fatigue and elastic aftereffects.
Question 3:
Find the work done in stretching a wire.
Question 4:
Discuss simple qualitative explanation of elasticity as explained according to molecular model of solids.
Question 5:
Draw and discuss stress versus strain graph, explaining clearly the terms elastic limit, permanent set, proportionality limit, elastic hysteresis, tensile strength.
Question 6:
What do you mean by following terms?
(a) Elastic bodies
(b) Plastic bodies
(c) Elastic energy
(d) Compressibility
Question 7:
What do you mean by deforming forces? Write detailed notes on crystalline solids and amorphous solids.
Section B
Instructions: -
All the question given below are short answer type questions. Write the answers accordingly.
Question 1:
When a wire is bent back and forth it becomes hot why?
Question 2:
Define the term bulk modulus. Give its SI unit. Give its SI unit. Give the relation between bulk modulus and compressibility.
Question 3:
Define shear modulus. With the help of a diagram explain how shear modulus can be calculated.
Question 4:
Which is more elastic steel or rubber? Explain
Question 5:
Stress strain curve for two wires of material A and B are as shown in Fig.

Stress Strain Curve for Two Wires of Material a and B
(a) Which material in more ductile?
(b) Which material has greater value of young modulus?
(c) Which of the two is stronger material?
(d) Which material is more brittle?
Question 6:
Two wires P and Q of same diameter are loaded as shown in the figure. The length of wire P is L m and its young’s modulus is while length of wire a is twice that of P and its material has young’s modulus half that of P. Compute the ratio of their elongation.

Two Wires P and Q of Same Diameter