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SECOND SUMMATIVE EXAMINATION -2018 ( Answer Key )

6th Standard

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Maths

Time : 02:00:00 Hrs
Total Marks : 60
I. Choose the best answer
5 x 1 = 5
1. The only even prime number is

(a)

4

(b)

6

(c)

2

(d)

0

2. 9 m 4 cm is equal to ____________

(a)

94 cm

(b)

904 cm

(c)

9.4 cm

(d)

0.94 cm

3. Number of ordinary years between two consecutive leap years is _______________

(a)

4 years

(b)

2 years

(c)

1 year

(d)

3 years

4. Discount = M.P. - _____________

(a)

Profit

(b)

S.P.

(c)

Loss

(d)

C.P.

5. The given triangle is ___________

(a)

a right angled triangle

(b)

an equilateral triangle

(c)

a scalene triangle

(d)

an obtuse angled triangle

6. II. Fill in the blanks
5 x 1 = 5
7. The numbers 29 and________ are twin primes.

()

31

8. The HCF of two successive even numbers is _______________

9. 20 l – 1 l 500 ml = _________l _________ml

()

18 l 500 ml

10. Every triangle has at least __________ acute angles.

()

two

11. The sum of three angles of a triangle is ___________.

()

180°

12. III. True or False
5 x 1 = 5
13. If a number is divisible by 6, then it must be divisible by 3.

(a) True
(b) False
14. The number of distinct prime factors of 105 is 3.

(a) True
(b) False
15. The HCF of 17 and 18 is 1

(a) True
(b) False
16. Meena bought 250 ml of buttermilk which is equal to 2.5 l.

(a) True
(b) False
17. Vanmathi bought 4 books each weighing 500 g. Total weight of 4 books is 2 kg.

(a) True
(b) False
18. IV. Answer any 10 Questions:
10 x 2 =20
19. Your friend says that every odd number is prime. Give an example to prove him/her wrong.

20. Find the prime factorisation of each number by factor tree method and division method.
a) 60  b) 128  c) 144  d) 198  e) 420  f) 999

21. Find the HCF of each set of numbers using prime factorisation method.
(i) 18, 24   (ii) 51, 85    (iii) 61, 76     (iv) 84, 120    (v) 27, 45, 81     (vi) 45, 55, 95

22. Murali has a bag that weighs 3 kg and 450 g. What is its weight in gram?

23. A child needs 100 g of vegetables per day. How many kg of vegetables will be needed for a school of strength 90.

24. Subtract 10 hours 20 minutes 35 seconds from 12 hours 18 minutes 40 seconds

25. I am a closed figure with each of my three angles is 60°. Who am I?

26. What are the angles of an isosceles right angled triangle?

27. If one angle of an isosceles triangle is 70°, then find the possibilities for the other two angles.

28. A table is bought for Rs 4500 and sold for Rs 4800. Find the profit or loss.

29. Valarmathi sold her pearl set for Rs 30,000 at profit of Rs 5000. Find the cost price of the pearl set.

30. Convert into a Tree diagram (9$\times$5) + (10$\times$12)

31. Convert '5a' into Tree diagram

32. Two angles of the triangles are given. Find the third angle.
(i) 80°, 60°
(ii) 75°, 35°
(iii) 52°, 68°
(iv) 50°, 90°
(v) 120°, 30°
(vi) 55°, 85°

33. V. Amnswer any Four questions
4 x 5= 20
34. Find the HCF of the numbers 40 and 56 by division method.

35. In a school,200 litres of lemon juice is prepared. If 250 ml lemon juice is given to each student, how many students get the juice?

36. Mala's date of birth is 20-11-1999. What is her age on 05-10-2018?

37. Convert the following:
(i) 20 minutes into seconds
(ii) 5 hours 35 minutes 40 seconds into seconds
(iii) 3 ½ hours into minutes
(iv) 580 minutes into hours
(v) 25200 seconds into hours

38. Somu bought a second hand bike for Rs 28,000 and spent Rs 2,000 on its repair. He sold it for Rs 30,000. Find his profit or loss.

39. Convert the tree diagram into numerical expression.

40. Can a triangle be formed with the following sides? If yes, name the type of triangle.
(i) 8 cm, 6 cm, 4 cm
(ii) 10 cm, 8 cm, 5 cm
(iii) 6.2 cm, 1.3 cm, 3.5 cm
(iv) 6 cm, 6 cm, 4 cm
(v) 3.5 cm, 3.5 cm, 3.5 cm
(vi) 9 cm, 4 cm, 5 cm

41. VI. Answer any one of the following questions

4 x 5 = 20
1. Construct a line perpendicular to the given line through a point above it.

2. Draw a line segment AB = 6.5 cm and mark a point M above it. Through M draw a line parallel to AB.