CBSE last year important question
Of class 9th on chapter Archimedes principle and floatation
Very short answer type questions (1 mark each)
1. What are the units of (a) thrust (b) pressure?
2. Why is thrust considered a force under specific conditions?
3. Write mathematical expression for the pressure exerted by a liquid at a depth of h inside it.
4. What is buoyant force?
5. How much thrust is exerted by a body when placed on a horizontal surface?
6. How does the thrust exerted by a body resting on a horizontal surface vary with its orientation?
7. How is the effect of force exerted on a body measured?
8. What are the SI units of (a) density (b) relative density
9. Why does a stone sink when placed in water, whereas a cork floats on the surface of water?
Short answer type questions (2 marks each)
10. State Archimedes' principle.
11. Name the factors on which the buoyant force depends.
12. Why is the lowering of weight of a body when immersed in water called apparent decrease in weight?
13. Draw diagram showing the forces acting on a body when it (a) sinks into water (b) floats partially above the surface of water (c) floats completely immersed into water.
Short answer type questions (3 marks each)
14. How is flotation related to the density of the solid and that of the liquid?
15. Why does ice float on water?
16. Why does an object appear to lose weight when immersed in a liquid?
Long answer type questions (5 marks each)
17. By a suitable mathematical expression, show that the buoyant force on a body placed in a liquid is equal to the weight of the liquid displaced by the body.
18. How is relative density of a solid determined by using Archimedes' principle? Derive the formula used.
19. What is the law of floatation? Name an instrument developed on the basis of the law of floatation.
20. Why does a ship made of iron float while a piece of iron sinks?
21. Should a ball of solid iron float over mercury or not? Give reason.
22. Describe the construction/design and working of a hydrometer.
Of class 9th on chapter Archimedes principle and floatation
Very short answer type questions (1 mark each)
1. What are the units of (a) thrust (b) pressure?
2. Why is thrust considered a force under specific conditions?
3. Write mathematical expression for the pressure exerted by a liquid at a depth of h inside it.
4. What is buoyant force?
5. How much thrust is exerted by a body when placed on a horizontal surface?
6. How does the thrust exerted by a body resting on a horizontal surface vary with its orientation?
7. How is the effect of force exerted on a body measured?
8. What are the SI units of (a) density (b) relative density
9. Why does a stone sink when placed in water, whereas a cork floats on the surface of water?
Short answer type questions (2 marks each)
10. State Archimedes' principle.
11. Name the factors on which the buoyant force depends.
12. Why is the lowering of weight of a body when immersed in water called apparent decrease in weight?
13. Draw diagram showing the forces acting on a body when it (a) sinks into water (b) floats partially above the surface of water (c) floats completely immersed into water.
Short answer type questions (3 marks each)
14. How is flotation related to the density of the solid and that of the liquid?
15. Why does ice float on water?
16. Why does an object appear to lose weight when immersed in a liquid?
Long answer type questions (5 marks each)
17. By a suitable mathematical expression, show that the buoyant force on a body placed in a liquid is equal to the weight of the liquid displaced by the body.
18. How is relative density of a solid determined by using Archimedes' principle? Derive the formula used.
19. What is the law of floatation? Name an instrument developed on the basis of the law of floatation.
20. Why does a ship made of iron float while a piece of iron sinks?
21. Should a ball of solid iron float over mercury or not? Give reason.
22. Describe the construction/design and working of a hydrometer.
