Triangles Important Questions Line l is the bisector of an angle ∠A and B is any point on l. BP and BQ are perpendiculars from B to the arms of ∠ A. Show that: ΔAPB ≅ ΔAQB BP = BQ or B is equidistant from the armsof ∠A. In ΔABC, ∠A – ∠B = 33° […]
Lines and Angles Important Questions The diagonals of the rectangle ABCD intersect at O. If ∠COD = 78°, then ∠OAB is: 35o 51o 70o 110o If AB = x + 3, BC = 2x and AC = 4x – 5, then for what value of ‘x’, B lies on AC? 2 3 5 8 In the given Figure , […]
Introduction To Euclid’s Geometry – Important Questions The number of dimension that a point has is: 0 1 2 3 What are the five postulates of Euclid’s Geometry? Consider two ‘postulates’ given below: Given any two distinct points A and B, there exists a third point C which is in between A and B. There […]
Linear Equations In Two variables – Important Questions On the graph paper draw the straight line 3x – 2y = 4 and x + y – 3 = 0. Also, find their point of intersection on the graph. Find the value of k, if x = 2, y = 1 is a solution of the […]
Coordinate Geometry – Important Questions On which axes do the given points lie: (7, 0) (0, -3) (0, 6) (-3, -6) . .Name the horizontal and vertical lines of Cartesian plane. In which quadrant or on which axis do each of the points (-2, 4), (3, -1), (-1, 0), (1, 2), (0, 2) and (-3, […]
Gravitation Important Questions An object is thrown vertically upward and rises to height of 10 m. Calculate the (i) the velocity by which the object was thrown upward and (ii) the time taken by object to reach the highest point. The mass of earth is 6.4 x 1024 kg and that of the moon is […]
Structure of the Atom Notes Sub atomic particles:- Electron , proton and neutron. Electron was identified by J.J. Thomson in 1897, proton was identified by E. Goldstein in 1886 and neutron was identified by James Chadwick in 1932. The mass of proton is approximately 2000 times as that of the electron. The charges of proton […]
Diversity in Living Organisms Notes The hierarchy of classification groups:- KingdomPhylum (for animals) / Division (for plants) Class Order Family Genus Species There are five types of kingdoms:- Monera:- They are unicellular prokaryotes. Some of them have cell wall while some do not. The mode of nutrition in some of them is autotrophic and in […]
The Fundamental Unit of Life Important Questions Define nucleoid. . Why mitochondria is called the powerhouse of the cell ? Why is the inner membrane of mitochondria deeply folded ? Where is protein synthesized in a cell ? Explain. Name the three solutions that can be used to stain the cell while observing it under […]
Class 9 Polynomials Important Questions Using suitable identity determine the value of :- (17)3 + (-12)3 + (-5)3 64m3 – 343n3 Factorise :- 2y3 – 4y2 – 2y + 4 2×2 + 7x + 3 Factorise : (a-b)3 + (b-c)3 + (c-a)3 If (a + b + c) = 15 and a2 + b2 + […]