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9th Class Examination 2015 Physics important Question / Notes Chapter 6 to 9

9th Class Examination 2015 Physics  important Question / Notes  Chapter 6 to 9

1. Define work and also define its unit.
2. A body of mass 50kg is raised to a height of 30m. What is its potential energy? (g= 10ms-2)
3. Write a short note on nuclear energy?
4. Define efficiency. How we can find out the percentage efficiency?
5. Why fossil fuels are called non-renewable form of energy? Also give its examples.
6. Which form of energy is most preferred and why?
7. What do you mean by an ideal system?
8. What is meant by the term power? Write its formula, its unit and its bigger units.
9. How can we produce energy from a biomass?
10. What is meant by interconversion of energy?

Long Questions 5×1=5
1. (a) Write a note on solar cell and fossil fuels. 3
1. Define density and write down the density equations.
2. Why does a piece of stone sink in the water but a ship with a huge weight floats?
3. What is Hook’s law? What is meant by elastic limit?
4. How we can push the liquid up with the help of straw?
5. A wooden cube of sides 10cm each has been dipped completely in water. Calculate the upthurst of water acting on it.

6. The mass of 200cm3 of stone is 500g. Find its density.
7. State the Pascal’s law. What are its applications in our daily life?
8. What is barometer? Why water is not suitable to be used in barometer?
9. Why does the atmospheric pressure vary with height?
10. Which important features tell in kinetic molecular model of matter?

Long Questions 5×1=5

1. (a) State and explain the principle of flotation, how ships and submarines work on this principle? 2.5
1. Normal body temperature of human body is 98.60 F. Convert it into Celsius scale and Kelvin scale.
2. What is thermometer? Why mercury is preferred as a thermometric substance?

3. Define heat capacity and specific heat capacity.
4. Define latent heat of vaporization and how it is denoted?
5. A brass rod is 1m long at 00 C. Find its length at 300 C.
(Coefficient of linear expansion of brass= 1.9×10-5 K-1)
6. What is bimetal strip and where it is used in our daily life?
7. How does heating affect the motion of molecules of a gas?
8. Temperature of water in a beaker is 500 C. What is its value in Fahrenheit scale?
9. Define the term heat and temperature.
10. Write down some important applications of thermal expansion.

Long Questions 5×1=5
1. (a) What is meant by evaporation? On what factors the evaporation of a liquid depends? Explain how cooling is produced by evaporation? 3

(b) How much heat is required to increase the temperature of 0.5 kg of water from 100 C to 650 C? 2

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