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Long Questions (8 marks each)
1. Define elasticity and elastic limit. Show that a force may produce change in size and shape of solids.
2. What is Hooke's law? Illustrate its applications. Also, define and calculate the spring constant.
3. Draw and explain the force-extension graph for elastic solids.
4. Define and explain pressure. What is the effect of area on pressure acting on a surface?
5. Explain the term atmospheric pressure along with its units. How is atmospheric pressure measured with a liquid barometer? Explain its construction and applications.
6. Explain with examples how atmospheric pressure varies with altitude. What kind of weather change is indicated by variation in atmospheric pressure? What are different applications of atmospheric pressure?
7. Show that liquid in a container exerts pressure equal to \( P = \rho gh \). What is the effect of depth on the pressure of a liquid?
8. State Pascal's law. Describe the working principle of a hydraulic lift using Pascal's law. What do you mean by a force multiplier?