Lesson 10.1 – Elasticity, Stress & Strain 

Foundation (Q1–5)

1. Define elasticity.

2. What is stress?

3. What is strain?

4. State Hooke’s law.

5. Give two examples of elastic materials.

Intermediate (Q6–10)

6. A wire of area 2 mm² carries a force of 200 N. Calculate stress.

7. A 1 m rod stretches by 0.5 mm. Calculate strain.

8. Draw stress–strain graph for ductile material.

9. Explain limit of proportionality.

10. Compare elastic and plastic deformation.

Advanced (Q11–15)

11. Derive Young’s modulus using stress and strain.

12. Analyse energy stored per unit volume in stretched material.

13. Explain why steel is preferred over rubber in bridges.

14. Solve multi-step problem involving stress, strain, and Young’s modulus.

15. Evaluate failure of brittle material using stress–strain curve.

Lesson 10.2 – Young’s Modulus & Elastic Potential Energy 

Foundation (Q1–5)

1. What is Young’s modulus?

2. State formula E = stress/strain.

3. Define elastic potential energy.

4. Write U = ½kx².

5. Give units of Young’s modulus.

Intermediate (Q6–10)

6. Calculate Young’s modulus for wire stretched by known force.

7. Explain significance of high Young’s modulus.

8. A spring stretches 0.1 m under force 20 N. Calculate k.

9. Explain U–x graph for spring.

10. Distinguish stiff vs flexible materials.

Advanced (Q11–15)

11. Derive U = ½Fx for variable force.

12. Solve energy stored problem for spring system.

13. Analyse material selection using Young’s modulus.

14. Compare elastic energy in two different materials given identical stress.

15. Evaluate limitations of Hooke’s law.

Lesson 10.3 – Viscosity & Fluid Resistance 

Foundation (Q1–5)

1. Define viscosity.

2. What is laminar flow?

3. Define coefficient of viscosity.

4. State unit of viscosity.

5. Give two examples of viscous fluids.

Intermediate (Q6–10)

6. Explain why honey flows slower than water.

7. State Stokes’ law: F = 6πηav.

8. Define terminal velocity.

9. Compare laminar and turbulent flow.

10. Calculate viscous force on a sphere.

Advanced (Q11–15)

11. Derive Stokes’ law qualitatively.

12. Solve terminal velocity problem for falling sphere.

13. Analyse effect of viscosity on sedimentation.

14. Discuss assumptions behind Stokes’ law.

15. Compare viscosity of liquids vs gases with temperature.

Lesson 10.4 – Surface Tension & Capillarity 

Foundation (Q1–5)

1. Define surface tension.

2. Give unit of surface tension.

3. What is capillary rise?

4. Define angle of contact.

5. Give one application of surface tension.

Intermediate (Q6–10)

6. Explain why water rises in a capillary tube.

7. State formula h = 2T cosθ / ρgr.

8. Draw surface profile for water in glass.

9. Distinguish adhesive vs cohesive forces.

10. Explain role of surface tension in insects walking on water.

Advanced (Q11–15)

11. Derive capillary rise formula.

12. Calculate rise of liquid in narrow tube.

13. Explain pressure difference across curved surface.

14. Analyse effect of detergents on surface tension.

15. Compare capillarity in wetting vs non-wetting liquids.

Lesson 10.5 – Pressure in Fluids & Upthrust 

Foundation (Q1–5)

1. Define pressure.

2. State formula P = hρg.

3. What is upthrust?

4. State Archimedes’ principle.

5. Define density.

Intermediate (Q6–10)

6. Calculate pressure at depth 5 m in water.

7. Explain why objects feel lighter in water.

8. Distinguish floating, sinking, and neutral equilibrium.

9. Derive expression for upthrust.

10. Explain why ships float despite being heavy.

Advanced (Q11–15)

11. Solve multi-depth pressure difference problem.

12. Analyse floating body stability using centre of buoyancy.

13. Calculate volume submerged of floating object.

14. Discuss density variation with pressure and temperature.

15. Evaluate design of ships using hydrostatics.

Lesson 10.6 – Fluid Dynamics (Bernoulli, Continuity) 

Foundation (Q1–5)

1. State continuity equation.

2. Define flow rate.

3. What is Bernoulli’s principle?

4. Distinguish streamline from turbulent flow.

5. Give example of Bernoulli in daily life.

Intermediate (Q6–10)

6. Apply continuity equation to find velocity in narrower pipe.

7. Explain why pressure decreases when fluid speeds up.

8. Solve simple Bernoulli pressure problem.

9. Describe venturi effect.

10. Explain lift on an airplane wing.

Advanced (Q11–15)

11. Derive Bernoulli’s equation.

12. Solve full Bernoulli + continuity multi-step problem.

13. Analyse energy losses in real fluids.

14. Explain limitations of Bernoulli equation.

15. Compare laminar vs turbulent flow using Reynolds number.