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