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10th (X) Science solved Paper SA Term-1 (Sep)

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Q.1. What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes? Ans: Iron nails get coated with a reddish brown substance. Copper sulphate solution becomes light green Q.2. A charged particle enters at right angles into a uniform magnetic field. What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field ? Ans: Positive charge / Proton Q.3. What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction. Ans: (i) A white precipitate / Insoluble substance is formed. (ii) If the reactants are in solid state.  (iii) Na2SO4 + BaCl2

10th Math's Chapter 14 -Statistics CBSE Board Questions from 2013

Set-01 1. The class mark of the class 10 – 25 is :  (A) 17 (B) 18 (C) 17.5 (D) 15 2. Find the mean of the following frequency distribution [by assumed mean method] Class : 0 – 6 6 – 12 12 – 18 18 – 24 24 – 30  Frequency : 7 5 10 12 6 3. Find the mode of the following frequency distribution Class : 0 – 6 6 – 12 12 – 18 18 – 24 24 – 30 Frequency : 7 5 10 12 6 4. If the mean of the following distribution is 27, find the value of p Class : 0 – 10