CBSE ADDA

JSUNILTUTORIAL PUNJABI COLONY GALI NO Multiple choice question  CHEMISTRY X   Chemical Reaction and Equations 1. Respiration is: (a) Endothermic reaction (b)Exothermic reaction (c) Addition reaction (d) None 2. Photolysis is: (a) Decomposition (b) Addition (c) Displacement (d) Oxidation 3. Fe2O3 + 3CO → 2Fe + 3CO2, which is reducing agent in the above reacton:  (a) Fe2O3 (b) CO (c) Fe (d) CO2 4. What are the conditions for rusting of an iron article: (a) Presence of air (b) Presence of moisture (c) Both (d) None 5. Plaster of Paris is (a) 2CaSO4.H2O (b) CaSO41/2H2O (c) Both (d) None 6. Oxidation reaction is a chemical process in which a substance: (a) Gains hydrogen (b) Gains oxygen (c) Gains chlorine (d) None  7. Hydration means: a) addition of hydrogen (b) addition of hydrogen chloride (c) addition of sulphuric acid (d) addition of water  8.The decom...

CBSE ADDA _ Quick recap  Chemicals Equations  1. Chemical reactions- Chemical changes or chemical reactions are the changes in which one or more new substances are formed. 2. Chemical Equations – Representation of a chemical reaction in terms of symbols and formulae of the reactants and products is known as chemical equation. 3. Balanced Chemical equation – The chemical equation in which the no. of atoms of different elements is same on both sides of the arrow is called balanced chemical equation. 4. The chemical reactions can be classified into different types such as (a) Combination reactions- The reactions in which two or more substances combine to form a new substance are called combination reactions. For example, 2Mg(s) + O2 (g) → 2 MgO (s) (b) Decomposition reactions – The reactions in which a single compound breaks up into two or more simpler substances are called decomposition reactions. For example, 2Pb (NO3)2 (s) → 2PbO(s) + 4NO2 (g) + O2 (g) The...

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1. Find the equation of the set of points which are equidistant from the points (1, 2, 3) and (3, 2, –1).   [Hint: let the point be P(x, y, z). given points be A(1, 2, 3) and B(3, 2, - 1). Then PA = PB] ans: x – 2z = 0 2.Find the equation of the set of points P, the sum of whose distances from A (4, 0, 0) and B (– 4, 0, 0) is equal to 10.  [Hint: let the point be P(x, y, z). given points be A(4, 0, 0) and B(-4, 0, 0). Then PA + PB = 10] 3.Find the coordinates of the point which divides the line segment joining the points (– 2, 3, 5) and (1, – 4, 6) in the ratio (i) 2 : 3 internally, (ii) 2 : 3 externally.  Ans: i) (-4/5, 1/5, 27/5) ii) (-8, 17, 3) 4.Given that P (3, 2, – 4), Q (5, 4, – 6) and R (9, 8, –10) are collinear. Find the ratio in which Q divides PR.  Ans : 1:2  5. Find the ratio in which the YZ-plane divides the line segment formed by joining the points (–2, 4, 7) and (3, –5, 8).  [hint: any point on YZ plane is of the f...

You first read CBSE X Maths Constructions Solved Questions CONSTRUCTIONS Questions for self practice  1. Draw a line segment AB of length 4.4cm. Taking A as centre, draw a circle of radius 2cm and taking B as centre, draw another circle of radius 2.2cm. Construct tangents to each circle from the centre of the other circle. 2. Draw a pair of tangents to a circle of radius 2cm that are inclined to each other at an angle of 90. 3. Construct a tangent to a circle of radius 2cm from a point on the concentric circle of radius 2.6cm and measure its length. Also, verify the measurements by actual calculations. (length of tangent =2.1cm) 4. Construct an isosceles triangle whose base is 7cm and altitude 4cm and then construct another similar triangle whose sides are 3/2 times the corresponding sides of the isosceles triangle. 5. Draw a line segment AB of length 8cm. taking A as center, draw a circle of radius 4cm and taking B as centre, draw another ...

                                            ir 1. The number of solutions of the pair of linear equations  x +  2 y –  8 = 0 and 2 x +  4 y =  16 is : (a) 0 (b) 1 (c) infinitely many (d) none of these 2. The graphical representation of the pair of equations  x +  2 y –  4 = 0 and 2 x +  4 y –  12 = 0 represents (a) intersecting lines (b) parallel lines (c) coincident lines (d) all of these 3. If a pair of linear equations is consistent, then the lines will be : (a) parallel (b) always coincident (c) intersecting or coincident (d) always intersecting 4. The condition so that the pair of linear equations  kx +  3 y +  1 = 0, 2 x + y +  3 = 0 has exactly one solution is : (a)  k =  6 (b)  k  ≠ 6 (c)  k =  3 (d)  k  ≠ 3 5. The lines representing the ...