Answer all the following questions:
Q.1. Define pressure? Write its SI unit.
Q.2. Give two examples of POSITIVE WORK.
Q.3. Convert 1kWh or 1 commercial unit into joules.
Q.4. What is Archimedes' principle? Write one application of this principle.
Q.5. What are the advantages of classifying organisms?
Q.6. Who was the father of Taxonomy? Write scientific name of our national flower.
Q.7. In which kingdom will you place an organism which is single-celled, eukaryotic and photosythetic?
Q.8. Name one example of the fish with skeleton made of bone and cartilage.
Q.9. Write two differences between Amphibians and Reptiles.
Q.10. Which postulate of Dalton's atomic theory is the basis of law of conservation of Mass? Give one example?
Q.11. Define law of constant proportions. Calculate given mass into moles (a) 4.4 g of CO2 (b) 34g of ammonia.
Q.12. Write down the formulae of (a) Aluminium chloride (b) sodium sulphide
Q.13. Differentiate between K E and P E with 1 example from each. A porter lifts a luggage of 15 kg.
Q.14. What are the difference between monocots and dicots. Give 1 example each.
Q.15. Draw a label diagram of Amoeba.
Q.16. Write Avogadro's number. Calculate the number of Molecules in 1.5 moles of calcium carbonate.
Q.17. Define the following: (a) poly atomic ions (b) valency (c) atomicity
Q.18. Write down the names of the following compounds (a) Al2(SO)3 (b) NaCl (c) CaCO3
Q.19. Derive the formula E(k)=(1/2)mv2
The kinetic energy of an object of mass m moving with a velocity 5 m/s is 25j. WHat will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times.
Q.20. Who classified organisms into five kingdoms? Describe the characteristics of five kingdom classification with suitable examples.