27) 491400 =

A) 2³ × 3³ × 5³ × 7 × 13
B) 2³ × 3³ × 5² × 7 × 13
C) 2³ × 3² × 5² × 7 × 13
D) 2² × 3² × 5² × 7 × 13

28) Which of the following is not irrational?

A) 5 – √3
B) 7 – √4
C) √2 + √3
D) √2 – √3

29) Which of the following is true?

A) HCF(p × q × r) × LCM(p × q × r) = p × q × r
B) HCF(p × q × r) + LCM(p × q × r) = p × q × r
C) HCF(p × q × r) × LCM(p × q × r) ≠ p × q × r
D) HCF(p × q × r) – LCM(p × q × r) = p × q × r

30) A prime number p divides a² where a is a positive integer, then

A) p divides a
B) p does not divide a
C) p is equal to a
D) All of these

31) The zero of linear polynomial ax + b is:

A)
B)
C)
D)

View Answer

D)

Explanation:Zero of ax + b = 0 ⇒ x = −b/a
Answer: