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#### Properties of Matter Two Marks Question

11th Standard

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
15 x 2 = 30
1. Define stress and strain.

2. State Hooke’s law of elasticity.

3. Define Poisson’s ratio.

4. Explain elasticity using intermolecular forces.

5. State Bernoulli’s theorem.

6. What are the energies possessed by a liquid? Write down their equations.

7. Two streamlines cannot cross each other. Why?

8. Define surface tension of a liquid. Mention its S.I unit and dimension.

9. We can cut vegetables easily with a sharp knife as compared to a blunt knife. Why?

10. Why the passengers are advised to remove the ink from their pens while going up in an aeroplane?

11. We use straw to suck soft drinks, why?

12. Incase of emergency, a vacuum brake is used to stop the train. How does this brake works?

13. Is stress a vector quantity?

14. A wire of length L and cross section A is made of material of youngs modulus y. It is stretched by an amount x. What is the work done?

15. A soap bubble in vacuum has a radius of 3cm & another soap bubble in vacuum has a radius of 4cm if the 2 bubbles coalesce under isothermal conditions then what is radius of the new bubble?