Question

1. Prime factorisation of the smallest 4-digit number is A) 10 x 100 B) 5 x 5 x 5 x 5 x 2 x 2 x 2 x 2 C) 2 x 2 x 2 x 5 x 5 x 5 D) 10 x 10 x 10 Ans: B)1 2. HCF of 72, 36, 108 is A) 12 B) 36 C) 72 D) 108 Ans: A)12 3. If the sum of two angles is equal to an obtuse angle, then which of the following is not possible? A) one obtuse and one acute angle B) one right angle and one acute angle C) two acute angles D) two right angles Ans: D) two right angles 4. The Greatest 3-digit number exactly divisible by 9, 12 and 15 is A) 999 B) 980 C) 960 D) 900 Ans: C)960 5. Which of the following is a pair of co-prime numbers? A) 18, 20 B) 99, 100 C) 7, 91 D) 17, 34 Ans:B) 99,100 6. How many triangles are there in the figure given below? A) 9 B) 10 C) 12 D) 13 Ans: B)10 7. Which of the following statements is not true? A) The HCF of two consecutive numbers is 1. B) The HCF of two prime numbers is 1. C) The HCF of two consecutive even numbers is 1. D) The HCF of two co- prime numbers is 1. Ans:C)The HCF of two consecutive even numbers is 1. 8. What part of revolution is turned, if facing North you turn clockwise to face East? A) 14 B) 12 C) 34 D) 1 Ans: C)1/4 9. Which solid shape has the greatest number of faces? A) cone B) cylinder C) cube D) triangular Prism Ans:C)Cube 10. A quadrilateral with exactly one pair of parallel sides is: A) a square B) a rhombus C) a kite D) a trapezium Ans: D)a trapezium 11. Which of the following is not a pair of twin primes? A) 9, 11 B) 17, 19 C) 59, 61 D) 101, 103 Ans: A)9,11 12. Three city tour buses leave the bus stop at 9:00 a.m. Bus A returns every 30 minutes, Bus B returns every 20 minutes and Bus C returns every 15 minutes. What is the next time, the buses will all return at the same time to the bus stop? A) 9:30 a.m. B) 10:00 a.m. C) 11:00 a.m. D) 11:30 a.m. Ans: 13. State the type of angle shown on the clock face: A) acute angle B) right angle C) reflex angle D) obtuse angle Ans:C)reflex angle 14. Which of the following is a model of perpendicular lines? A) the lines of a railway track B) the line segments forming the symbol of addition ‘+’ C) the line segments forming the letter ‘X’ D) the opposite edges of a postcard. Ans:B)the line segments forming the symbol of addition ‘+’ . 15. Where will the hour hand of a clock stop if it starts from 5 and turns through 2 right angles? A) 8 B) 10 C) 11 D) 12 Ans: C)11 16. When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be A) reflex angle B) acute angle C) right angle D) obtuse angle Ans: D)obtuse angle 17. The sum of first three common multiples of 4 and 5 is A) 20 B) 80 C) 100 D) 120 Ans: D)120 18. The smallest number having 3 different prime factors is A) 6 B) 30 C) 60 D) 100 Ans: B)30 19. The least number when divided by 15, 20 and 40 leaves the remainder 9 in each case: A) 99 B) 109 C) 120 D) 129 Ans: D)129 IS IT CORRECT

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

do prime factorization