Ncert-class 9-maths-Number System Welcome to your Ncert-class 9-maths-Number System 1. Which of the following rational numbers is positive? 19/-13 -21/12 -8/7 -3/-4 None 2. After rationalizing the denominator of $$ \frac{7}{3\sqrt{3}-2\sqrt{2}}$$we get the denominator as 19 35 13 5 None 3. Simplify $$\frac{7+3\sqrt{5}}{3+\sqrt{5}}-\frac{7-3\sqrt{5}}{3-\sqrt{5}}$$ √7 None √15 √5 None 4. 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 5. The product of √x +2√y with its conjugate is? x+4y x−2y x−4y x+2y None 6. Simplify $$(6^{-1}-8^{-1})^{-1}-(2^{-1}-3^{-1})^{-1}$$ 20 10 30 40 None 7. ............... numbers have terminating and non- terminating repeating decimals. Irrational Integers Rational Whole None 8. A number of the form p/q is said to be a rational number if p and q are integers and P ≠ 0 p and q are integers and p ≠ 0 also q ≠ 0 p and q are integers p and q are integers and q ≠ 0 None 9. 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 3,2,4,1 2,4,1,3 3,2,1,4 1,2,3,4 None 10. 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 = 4 conjugate pair =√5-1 , product = 3 None 11. Choose the correct alternative answer for the question given below. Which one of the following is an irrational number? √196 $$\sqrt{\frac{16}{25}}$$ √5 3/9 None 12. Section AA rational number between √2 and √3 is (√2 + √3)/2 1.8 1.5 (√2 x √3)/2 None 13. Find one irrational number between 0.2101 and 0.2222. None 0.22010010001....... 0.25 0.2 None 14. Which one of the following has a terminating decimal expansion? 5/32 8/15 1/12 7/8 None 15. The square root of any prime number is co-prime irrational rational composite None 16. a×a×b×b×b can be written as None a³b³ a²b³ a³b² None 17. 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 True and R is False A is True and R is the correct explanation of A A is False and R is the correct explanation of A Both A and R are False None 18. Simplify $$7\sqrt{48}-\sqrt{72}-7\sqrt{27}+3\sqrt{2}$$ 25√3 - 3√2 5√3 - 3√2 25√3 - 9√2 25√3 - 13√2 None 19. 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 only 2 and 3 3 only 1 only None 20. Choose the correct alternative answer for the question given below.What is √n, if n is not a perfect square number? Natural number All are correct Irrational number Rational number 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.
