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