Lesson Archives

  1. Page No 73: Question 1: Check whether the following are quadratic equations: Answer: It is of the form . Hence, the given equation is a quadratic equation. It is of the form . Hence, the given equation is a quadratic equation. It is not of the form . Hence, the given equation is not a quadratic equation. It […]
  2. Page No 44: Question 1: Aftab tells his daughter, “Seven years ago, I was seven times as old as you were then. Also, three years from now, I shall be three times as old as you will be.” (Isn’t this interesting?) Represent this situation algebraically and graphically. Answer: Let the present age of Aftab be x. […]
  3. Page No 28: Question 1: The graphs of y = p(x) are given in following figure, for some polynomials p(x). Find the number of zeroes of p(x), in each case. (i) (ii) (iii) (iv) (v) (v) Answer: (i) The number of zeroes is 0 as the graph does not cut the x-axis at any point. (ii) The number of zeroes is […]
  4.                                                Group a What is program documentation? Why documentation is important for successful implementation of a system? Discuss the term computer architecture. Draw block diagram and explain main component of computer system. What do you mean virtual memory? How does it differ from main memory and secondary memory? Discuss                                                       Group b 4 What do […]
  5. Page No 28: Question 1: The graphs of y = p(x) are given in following figure, for some polynomials p(x). Find the number of zeroes of p(x), in each case. (i) (ii) (iii) (iv) (v) (v) Answer: (i) The number of zeroes is 0 as the graph does not cut the x-axis at any point. (ii) The number of zeroes is […]
  6. Page No 7: Question 1: Use Euclid’s division algorithm to find the HCF of: Answer: (i) 135 and 225 Since 225 > 135, we apply the division lemma to 225 and 135 to obtain 225 = 135 × 1 + 90 Since remainder 90 ≠ 0, we apply the division lemma to 135 and 90 […]
  7. Page No 118: Question 1: An index number which accounts for the relative importance of the items is known as (i) weighted index (ii) simple aggregative index (iii) simple average of relatives Answer: An index number which accounts for the relative importance of the items is known as weighted index An index number in which […]
  8. Page No 104: Question 1: The unit of correlation coefficient between height in feet and weight in kgs is (i) kg/feet (ii) percentage (iii) non-existent Answer: As there is non-existent of correlation between the height in feet and weight in kilograms, so the unit of correlation between the two is zero. Question 2: The range […]
  9. Page No 89: Question 1: A measure of dispersion is a good supplement to the central value in understanding a frequency distribution. Comment. Answer: The study of the averages is only one sided distribution story. In order to understand the frequency distribution fully, it is essential to study the variability of the observations. The average […]
  10. Page No 71: Question 1: Which average would be suitable in the following cases? (i) Average size of readymade garments. (ii) Average intelligence of students in a class. (iii) Average production in a factory per shift. (iv) Average wage in an industrial concern. (v) When the sum of absolute deviations from average is least. (vi) […]