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Brief Questions and Answers (3 marks each)
Q.1 What is Kinetic molecular theory? Write down its postulates.
Q.2 What is plasma?
Q.3 What do you know about density?
Q.4 Define pressure and write down its unit.
Q.5 Define pressure in liquids.
Q.6 State Pascal's Law.
Q.7 Explain the braking system of vehicles.
Q.8 State Archimedes Principle.
Q.9 Define the principle of floatation.
Q.10 What is atmospheric pressure?
Q.11 What is a barometer?
Q.12 Why is mercury used in barometers instead of water?
Q.13 What weather changes can be expected due to a decrease in atmospheric pressure?
Q.14 What weather changes can be expected due to an increase in atmospheric pressure?
Q.15 What is elasticity?
Q.16 What is stress?
Q.17 What is strain?
Q.18 What is Hooke's Law?
Q.19 Define Young's Modulus.
Q.20 What is the elastic limit?
Q.21 What are elastic materials? Give some examples.
Q.22 How is the property of elasticity used in our body?
Q.23 Prove that the SI unit of Young's modulus is Pascal or N/m².
Q.24 Prove that liquid pressure does not depend upon the mass of the liquid.
Q.25 Under what condition does an object float in water?