Ncert-class 9-maths-Number System Welcome to your Ncert-class 9-maths-Number System 1. Find the product of following with its conjugate pair. √5+1 conjugate pair =√5+1 , product = 3 conjugate pair =√5+1 , product = 4 conjugate pair =√5-1 , product = 3 conjugate pair =√5-1 , product = 4 None 2. If A : The quotient of two integers is always a rational number, and R : 1/0 is not rational, then which of the following statements is true ? A is False and R is the correct explanation of A A is True and R is the correct explanation of A A is True and R is False Both A and R are False None 3. Simplify $$7\sqrt{48}-\sqrt{72}-7\sqrt{27}+3\sqrt{2}$$ 25√3 - 9√2 25√3 - 13√2 25√3 - 3√2 5√3 - 3√2 None 4. Which of the following rational numbers is positive? -8/7 -21/12 -3/-4 19/-13 None 5. a×a×b×b×b can be written as a²b³ a³b² None a³b³ None 6. A number of the form p/q is said to be a rational number if p and q are integers p and q are integers and p ≠ 0 also q ≠ 0 p and q are integers and q ≠ 0 p and q are integers and P ≠ 0 None 7. Choose the correct alternative answer for the question given below. Which one of the following is an irrational number? 3/9 $$\sqrt{\frac{16}{25}}$$ √5 √196 None 8. Which one of the following has a terminating decimal expansion? 1/12 8/15 5/32 7/8 None 9. After rationalizing the denominator of $$ \frac{7}{3\sqrt{3}-2\sqrt{2}}$$we get the denominator as 13 35 5 19 None 10. Simplify $$\frac{7+3\sqrt{5}}{3+\sqrt{5}}-\frac{7-3\sqrt{5}}{3-\sqrt{5}}$$ √7 None √15 √5 None 11. Simplify $$(6^{-1}-8^{-1})^{-1}-(2^{-1}-3^{-1})^{-1}$$ 10 20 40 30 None 12. ............... numbers have terminating and non- terminating repeating decimals. Whole Irrational Integers Rational None 13. The square root of any prime number is composite co-prime irrational rational None 14. The product of √x +2√y with its conjugate is? x+2y x−2y x+4y x−4y None 15. Section AA rational number between √2 and √3 is 1.8 (√2 x √3)/2 1.5 (√2 + √3)/2 None 16. Consider the following statements: 1/22 cannot be written as a terminating decimal.2/15can be written as a terminating decimal.1/16 can be written as a terminating decimal.Which of the statements given above is/are correct? 2 and 3 3 only 2 only 1 only None 17. Choose the correct alternative answer for the question given below.What is √n, if n is not a perfect square number? Irrational number Rational number Natural number All are correct None 18. Find one irrational number between 0.2101 and 0.2222. None 0.25 0.22010010001....... 0.2 None 19. Give an example of two irrational numbers, whose difference is a rational number. 4-√2,2-√2 4+√2,2-√2 4-√2,2+√2 4+√2,2+√2 None 20. Following are the steps to represent √5 on number line.Arrange them in order.1) Draw OC on line with l(OC) =l(OB)2) Draw AB⊥OA and l(AB)=13) Take l(OA)=24) l(OC)=√5, C is required point on real line 2,4,1,3 1,2,3,4 3,2,4,1 3,2,1,4 None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
