Important Question For CBSE Class X Mathematics Board Examination 2009-10

Set - 2

Q. 1. State Euclid’s Division Lemma.

Q. 2. What is the HCF of 84 and 270 ?

Q. 3. Why the number 4n, where n is a natural number, cannot end with 0?

Q. 4. Why is 5 x 7 x 11 + 7 is a composite number?

Q. . 5. Why 40/9 is is a non – terminating decimal?

Q. 6. Using Euclid’s division algorithm, find the HCF of 2160 and 3520.

Q. 7. Use Euclid’s division algorithm to show that any positive odd integer is of the form 4q + 1 or 4q + 3, where q is some integer.

Q. 8. Four ribbons measuring 14 cm, 18 cm, 22 cm and 26 cm respectively are to be cut into least number of pieces of equal length. What is the length of each piece?

Q. 9. Write the condition to be satisfied by q so that a rational number p/q has a terminating expression.

Q. 10. Prove that 3 –√5 is an irrational number.

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