Class-IX
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Physical Science
I. Long Answer Questions
1. Explain the Three layers of earth.
2. What are positive and negative zero errors of a vernier calipers? How are they determined?
3. How do you construct a vernier scale for a given main scale?
4. Give the description of a vernier calipers.
5. How do you determine the length of an object using a vernier calipers?6. Give the description of a physical balance.
7. What are the precautions to be followed before using the balance.
8. What is the relationship between the length of a pendulum and period of oscillation.
9. Derive linear motions of equality(a) V= u+at (b) S=ut+1/2 at2 (c)V2-U2=2aS
10. Write an example to illustrate power.
11. Write ten examples of objects possessing potential energy.
12. Write ten examples of objects possessing kinetic energy.
13. Write examples of transformation of energy.
14. Is it desirable to have the free wheel and crack wheel of the same size in a cycle? Give explanation in support of your answer.
15. Describe a manometer. Explain how is it used for finding the pressure of gas.
16. Write down the properties of gases.
17. Describe the Construction of Mercury barometer.
18. Show that gases exhibit compressibility property.
19. State charle’s ;aw and deduce the relation Vt= V0[(273+t)/273]20. Describe an activity to show that lighter gases diffuse faster than heavier gases.
21. What are cathode rays? Who invented cathode rays? Write down the important properties of cathode rays.
22. What are anode rays? Who invented cathode rays? Write down the important properties of anode rays.
23. Elaborate the important characteristic properties of cathode rays with sketches.
24. Define an atomic model. Discuss the important aspects of JJ Thomson’s atomic model.
25. Describe Rutherford’s experiment of Scattering of alpha ray particles. What are the results of experiment?
26. What are important modifications in JJ Thomson’s atomic model? Discuss Rutherford’s Atomic model.
27. What are the draw backs of Rutherford’s model.
28. Explain the following (a) Chemical bond(b) Valence electrons(c)Ionic Linkage(d) Oxidation(e)Oxidizing agent(f)Reduction(g) Reducing agent(h)Covalent compounds(I) Polar molecules (J) Vander waals force.(k)A dipolar molecule (l) multiple bond.
29. Explain the formation of NaCl molicule.Write the equation with electron dot formula.
30. Explain the formation of Magnesium fluoride molecule. Write the equation with electron dot formula.
31. Explain the formation of potassium sulphate.Write down the equation with electron dot formula.
32. Explain the formation of calcium oxide molecule. Write the equation with dot formula.
33. Explain the formula of hydrogen molecule. Write the equation with dot formula.
34. Explain the formation of Hydrogen fluoride molecule. Write the equation with electron dot formula.
35. Explain the formation of oxygen molecule. Write the equation with electron dot formula.
36. The elements W,X,Y and Z have 7,9,10 and 11 as their atomic numbers respectively. Write the formula for the compound you would expect to form between the following pairs of elements and indicate the type of bonding present.(a) W and X (b) X and X (c) W and Z (d) Y and Y.
37. What is meant by a polar covalent molecule? Explain with example how it is formed.
38. Define ionic bond. Write down the properties of ionic compounds.
39. Define covalent bond. Write down the properties of covalent compounds.
40. What are the important aspects of Dalton’s atomic theory.
II. Short Answer Questions (2marks)
1. How do the scientists know about the interior of the earth?
2. How can you say that interior of the earth is hot.
3. Why do earthquakes occur?
4. What are the signs of occurrence of volcano?
5. Define the term Evolution.6. Define the term Volcano.7. Define light year.
8. What are the three layers of the interior of the earth?
9. What does the mantle comprise of?
10. When did the life began on earth?
11. What is principle of a vernier?
12. What is the advantage of a vernier scale?
13. Define the least count of an ordinary scale?
14. What is the least count of a vernier calipers?
15. Name the different instruments used for measuring the mass of substances.
16. Define RP
17. Define ZRP
18. Define HRP
19. Define LRP.
20. Define the mass of a body.
21. Define weight of a body.
22. Define the turning points.
23. State the first law of simple pendulum.
24. State the second law of simple pendulum.
25. State the third law of simple pendulum.
26. We say year 1997. What does it mean?
27. What are the fields in which
24-hour system is being adopted?
28. The angular amplitude should not be more than 5 degrees, Why?29. The bob should not be light like a cork. Why?
30. To find the time period we count 10 or 20 oscillations but not one or two. Why?
31. We use a stop clock in finding the period of a pendulum; We do not use our wrist watch. Why?
32. Define the length of simple pendulum.
33. What is meant by oscillation?
34. Define the time period or period of oscillation.
35. Define seconds pendulum
36. Define second.
37. Define second.
38. Define the time.
39. What is the standard unit of time?
40. What is meant by simple pendulum?
41. Define frequency of a pendulum?
42. What is meant by amplitude of a pendulum?
43. What is the length of the seconds pendulum.?
44. Define uniform acceleration.
