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Model Question Papers Books Indent Form School Kits Exemplar Problems Laboratory Manuals 50 years of NCERT Results Framework Document. ... NCERT, Sri Aurobindo Marg, New Delhi-110016. dceta.ncert@nic.in +91 8800440559. Important Helpline Numbers. Women Helpline Number : 7827170170.
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2 EXEMPLAR PROBLEMS – SCIENCE 5. Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO 4 and NaCl were added to the beakers A, B and C
APPLICATION OF DERIVATIVES 121 At (0, 0), the slope of the tangent to the curve y2 = x is parallel to y-axis and the tangent to the curve x2 = y is parallel to x-axis. ⇒ angle of intersection = 2 π At (1, 1), slope of the tangent to the curve y
44 EXEMPLAR PROBLEMS 27. A nail is inserted in the trunk of a tree at a height of 1 metre from the ground level. After 3 years the nail will (a) move downwards (b) move upwards
Exemplar Problems, Chemistry22 (ii) 0.008 (iii) 0.012 (iv) 0.016 25. On the basis of information given below mark the correct option. Information :On adding acetone to methanol some of the hydrogen bonds between methanol molecules break. (i) At specific composition methanol-acetone mixture will form minimum
78 EXEMPLAR PROBLEMS – MATHEMATICS When D < 0, roots of the quadratic equation are non real (or complex). 2. Let α, β be the roots of the quadratic equation ax2 + bx + c = 0, then sum of the roots (α + β) = b a − and the product of the roots ( α . β) = c a. 3. Let S and P be the sum of roots and product of roots, respectively , of a ...
58 EXEMPLAR PROBLEMS 6. Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of 10 m s–1.It implies that the boy is (a) at rest (b) moving with no acceleration
Exemplar Problems, Chemistry 6 29. If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio. (a) Is this statement true? (b) If yes, according to which law? (c) Give one example related to this law. 30.
MMMICROORGANISMS : F: : F FRRIEIENNDDSSRIENDS ANDANDAND F F FOOEEOE 11 25. Observe the Fig.2.3 and answer the following questions. Fig. 2.3 (a) Name the microorganism and the group to which it belongs. (b) Name the food item on which the organism grows.