CBSE ADDA

Acid,Bases & Salts Guess Question Paper – 2012 Class – X S... : "CBSE ADDA Guess Question Paper – 2012 Class – X Subject – Science (Acid,Bases & Salts) ..." CBSE ADDA

CBSE ADDA For more sample paper 2011-2012 visit    CBSE MATH COMPLETE STUDY                jsunilclasses.weebly.com JSUNIL CLASSES"A SMART CLASS CENTER"                                                                                                                         M.M : - 80                                     MATHEMATICS(X)  -2011-12                           TIME : - 3 hrs.                                                               SECTION – A 1. State   Euclid ’s division lemma. 2. If one zero of polynomial 5x 2 +13x+a  is reciprocal of the other, find the value of other. 3. In ΔABC, DE||BC meeting AB at D and AC at E. If AB/BD= 4and CE = 2 cm,     find the length of AE. 4. If 4 cotA = 3, find the value of (sinA- 4cos) / (sinA+ 4cos) 5.  Find the value of 4cot 2 θ − 4cos ec 2 θ . 6. Find the value of   sin 36 / 2cos54  -  2sec 41/3cos ec49 7. Why is 11/30a non ‐ terminating decimal number? 8. Find he value of ‘k’ if following system of equations has no solu

      visit for full length study of maths- Math full book study portal   Chapter-2, Is Matter Around Us Pure NCERT SOLUTION Q.1: Which separation techniques will apply for the separation of the following? (a) Sodium chloride from its solution in water. (b) Ammonium Chloride from a mixture containing Sodium Chloride and Ammonium Chloride. (c) Small pieces of metal in the engine oil of a car.    (d) Different pigments from an extract of flower petals. (e) Butter from curd. (f) Oil from water. (g) Tea leaves from tea. (h) Iron pins from sand. (i) Wheat grains from husk. (j) Fine mud particles suspended in water. Ans: (a) Crystallization or Evaporation. (b) Sublimation. (c) Centrifugation or Sedimentation. (d) Chromatography. (e) Centrifugation. (f) Separating funnel. (g) Hand-picking. (h) Magnetic separation. (i) Winnowing. (j) Centrifugation. Q.2: Write the steps you would use for making tea. Use the words - solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

1.   If twice the son’s age in years is added to the age of his father the sum is 90. If twice the father’s age in year is added to the age of the son, the sun in 120. Find their ages. 2.   Ram is three times as old as Rahim. Five years later, Ram will be two-and-a –half times as old as Rahim. How old are Ram and Rahim now? 3.   If the numerator of a fraction is multiplied by 2 and its denominator is increased by 2, it becomes 6/7. If instead we multiply the denominator by 2 and increase the numerator by 2 it reduces to 1/2. What is the fraction? 4.   A fraction becomes 4/5 if 1 is added to each of the numerator and the denominator. However, if we subtract 5 from each, the fraction becomes 1/2 find the fraction. 5.   If we add 1 in the numerator of a fraction and subtract 1 from its denominator, the fraction becomes 1, It is also given that the fraction becomes 1/2 when we add 1 to its denominator, and then what is the fraction. 6.   If we add 5 to the denomi