# CBSE Class 11-Physics: Properties of Bulk Matter – Elasticity Practice Paper (For CBSE, ICSE, IAS, NET, NRA 2023)

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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.