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  Exercise 2.1 Question 1: Which of the following expressions are polynomials in one variable and which are not? State the reason for your answer. i. (4x^2-3x+7) ii. (y^2+sqrt2) iii. (3sqrt{t}+tsqrt2) iv. (y+frac{2}{y}) v. (y+2y^{-1}) Answer: A polynomial in one variable refers to an expression where the exponent of the variable is a whole number. i. […]

   Exercise 1.1 Question 1: Do you think zero is a rational number? If it is, then can it be expressed in the form (frac{P}{q}), of  where (p) and (q) are integers an (qtheta0) d ? Describe it. Answer: Remember that, according to the definition of rational number, a rational number is a number that

Exercise 15.1 Question 1: Complete the following statements: (i) Probability of an event E + Probability of the event ‘not E’ = _______. (ii) The probability of an event that cannot happen is _________. Such as event is called _________. (iii) The probability of an event that is certain to happen is _________. Such as

Exercise 14.1 Question 1: A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house. Number of plants 0-1 2-4 4-6 6-8 8-10

Exercise 13.1          Question 1: 2 cubes each of volume (64space cm^3) are joined end to end. Find the surface area of the resulting cuboids. Answer: Given that, Volume of cubes (= 64space cm^3) ((Edge)^3 = 64) (Edge = 4space cm) If cubes are joined end to end, the dimensions of the resulting cuboid will be (4space cm,space

Exercise 12.1 Question 1: The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles. Answer: Radius (r1) of 1st circle = 19 cm Radius (r2) or 2nd circle = 9 cm Let the

Exercise 11.1 Question 1: Draw a line segment of length 7.6 cm and divide it in the ratio 5:8. Measure the two parts. Give the justification of the construction. Answer:  Answer: A line segment of length 7.6 cm can be divided in the ratio of 5:8 as follows. Step 1: Draw line segment AB of 7.6

Exercise 10.2 Question 1: From a point (Q), the length of the tangent to a circle is (24space cm) and the distance of (Q) from the centre is (25space cm). The radius of the circle is (a) (7space cm) (b) (12space cm)      (c)  (15space cm) (d) (24.5space cm) Answer: Let (O) be the centre

Exercise 9.1 Question 1: A circus artist is climbing a (20space m) long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is(30^0). Answer: It can be observe from the figure

Class 9 Science, NCERT – Chapter 12: Improvement in Food Resources Powered By EmbedPress