CBSE Pathshala

Is matter around us pure? Assignments 1. What are mixtures? Give examples. 2. What are pure substances? 3. Why do we call sugar a pure substance? 4. What are saturated and unsaturated solutions? 5. Define a solution. 6. What is a suspension? Give its example and properties. 7. Define concentration of a solution. 8. What is Tyndall effect? 9. What is the difference between True solution and colloids? 10. What are alloys? Why are alloys called as mixture? 11. Write the characteristics of brass. 12. Define solute and solvent. 13. What is solubility? 14. Give properties of a true solution. 15. Why do we need to separate mixtures? 16. How can we separate cream from milk? 17. Write the applications of centrifugation. 18. How can we separate a mixture of salt and ammonium chloride? Draw a diagram. 19. What is chromatography? Explain the process. 20. How can you separate copper sulphate from an impure sample? 21. What types of mixture are separated by...

1. What is matter? What are the physical states of matter? 2. With the help of an activity, show particulate nature of matter. 3. What are characteristics of particles of matter? 4. What is diffusion? Give an example. 5. Write any five characteristics of solids, liquids and gases. 6. Why can we smell hot food from a distance? 7. Why does a solid change into liquid on heating? 8. Define latent heat of fusion. 9. Give reason – A gas fills completely the vessel in which it is kept. 10. Why a wooden table should be called solid? 11. Why more serious burns are caused by steam than water at same temperature? 12. Why can a sponge be compressed though it is a solid? 13. Carry out following conversion (a) 50 deg.Cto Kelvin (b) 200 k to Celsius. 14. Name the conditions to liquefy a gas. 15. Why are clothes spread out for drying? 16. What kind of clothes is most suitable for summers? Why? 17. What is sublimation? Explain with help of an activity and a diagram. 18....

State the rule to determine the direction of a                      a) Magnetic field produced around a conductor carrying current.                                                              b) The force experienced by current carrying straight conductor placed in a magnetic field perpendicular to it.  c) Current induced in a coil due to its rotation in a magnetic field. From the following statement write down that which is applicable to a commutator.                                                    a) galvanometer uses commutator for deadbeat                        b) transformer u...

Magnetic Effect of Current Chapter 13 Student CBSE Worksheet Download File X Magnetic Effects of Currents CBSE Hot questions Download File X Magnetic Effects of Currents Important questions Download File X Magnetic Effects of Currents CBSE Question Banks                                                                                             Download File   For more test papers and sample paper related to this chapter Visit:        Link01          Link 02

Chapter wise Test papers IX Number system IX Polynomials IX Introduction to Euclid Geometry IX Lines and Angles IX Triangles IX Coordinate geometry IX Area of triangles by Heron's formula CBSE IX Mathematics SA-2  Chapter wise Test papers                  Download pag e CLASS- IX SCIENCE 1 Matter in Our Surroundings 2 Is Matter Around Us Pure 3 Atoms and Molecules 4 Structure of the Atom 5 The Fundamental Unit of Life 6 Tissues 7 Diversity in Living Organisms 8 Motion 9 Force and Laws of Motion 10 Gravitation 10. Thrust and Pressure 11 Work and Energy 12 Sound 1 3 Why Do We Fall i ll 14 Natural Resources 15 Improvement in Food Resources

Let a, b, c are length of the sides and h is height to side of length c  of ∆  ABC. We have S = (a + b + c)/2 So, 2s = a + b + c     Þ   2(s - a) = - a + b + c   Þ  2(s - b) = a - b + c   Þ   2(s - c) = a + b – c Let p + q = c as indicated. Then ,   h 2 =  a 2 - p 2         -------------(1)   Also,     h 2 = b 2 - q 2        -------------- (ii) From (i) and (ii)   Þ   a 2 - p 2     =    b 2 -  q 2            Þ   q 2    = - a 2 + p 2 + b 2       Since,   q = c - p  Þ q 2 = (c-p) 2 Þ q 2   = c 2 + p 2 -2pc Then, c 2 + p 2 -2pc   = - a 2 + p 2 + b 2       Þ - 2pc  =  - a 2 +b 2 – c 2 = - ( a 2 -b 2 + c 2 ) Þ   p = ( a 2 -b 2 + ...

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9th physics: Force and laws of Motion An object of mass 2 kg is sliding with a constant velocity of 4 m/ s   on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N                                    (b) 0 N                          (c) 2 N                          (d) 8 N                          (b]         Rocket works on the principle of conservation of (a) mass...