Playing With Numbers

48. What is the H.C.F. two consecutive odd numbers?

  • (A) 1 
  • (B) 2 
  • (C) 4 
  • (D) 8

47. Which of the following is smallest prime number?

  • (A) 1 
  • (B) 2 
  • (C) 3 
  • (D) 4

46. The smallest composite number is

  • (A) 1 
  • (B) 2 
  • (C) 3 
  • (D) 4

45. The only prime number which is also even is

  • (A) 1 
  • (B) 2 
  • (C) 4           
  • (D) 6

44. Which of following number is multiple of 8?

  • (A) 2 
  • (B) 4 
  • (C) 10         
  • (D) 16

43. What is the H.C.F. of 18 and 48?

  • (A) 2 
  • (B) 4 
  • (C) 6 
  • (D) 8

42. Which of the following pair is co-prime?

  • (A) 6 and 8 
  • (B) 18 and 35
  • (C) 7 and 35        
  • (D) 30 and 415

41. Which number is neither prime nor composite?

  • (A) 0 
  • (B) 1 
  • (C) 2 
  • (D) 3

40. Common factor(s) of 15 and 25 are

  • (A) 15
  • (B) 25         
  • (C) 5 
  • (D) 75

39. The exact divisor of number 9 is

  • (A) 2 
  • (B) 3 
  • (C) 4 
  • (D) 5

38. The product of three consecutive numbers is always divisible by

  • (A) 2 
  • (B) 4 
  • (C) 6 
  • (D) 8

37. The sum of two consecutive odd numbers is always divisible by

  • (A) 2 
  • (B) 4 
  • (C) 6 
  • (D) 8

36. What are the prime factors of greatest four-digit number

  • (A) 3 × 3 × 11 × 101       
  • (B) 9 × 11 × 101   
  • (C) 3 × 33 × 101   
  • (D) 3 × 3 × 11 × 11

35. Which of the following expressions represent the prime factorisation of the numbers?

  • (A) 24 = 2 × 3 × 4 
  • (B) 56 = 7 × 2 × 2 × 2     
  • (C) 70 = 2 × 5 × 7 
  • (D) 54 = 2 × 3 × 9

34. Which of the following numbers has 4 different prime factors?

  • (A) 24
  • (B) 120       
  • (C) 210       
  • (D) 100

33. Which of the following pairs is not co-prime?

  • (A) 8, 10
  • (B) 11, 12
  • (C) 1, 3
  • (D) 31, 33

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