Chapter 1 Real Numbers Q1. Choose the correct option: 1. HCF of (96, 404) is : a)  4     b) 120     c) 11     d) 5 2. HCF of (6, 20) is : a) 20     b) 6     c) 120     d) 2 3. HCF of  (91, 21)  is : a) 91     b) 21     c) 7      d) 12 4. If the product of two numbers is 32 and LCM is 8 then its HCF is : a) 4     b) 2     c) 1     d) 00 5. If two positive integers p and q are expressed as p = ab² and q = a³b; a, b being prime numbers, then LCM. (p,q) is : a) ab     b) a²b²     c) a³b²     d) a³b³ Answer: 1. b, 2. c, 3. c, 4. a, 5. c Q2. Fill in the blanks: 1. HCF. (a, b)×LCM. (a, b) = ..................  . 2. If `a = x^3y^2` and `y = xy^3`, where `x, y` are prime numbers, then HCF. (a, b) will be ............  . 3. `sqrt3` is a ............. number. 4. Rational and irrational numbers both are .......... numbers. 5. `sqrt3` is a ............ number. Answer: 1. a×b, 2. `xy^2`, 3. irrational, 4. real, 5. irrational.  Q3. Match the column :                   A