Nstse Class 4 Solution 1z3j1a

UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n

NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Paper Code: UN 415 Solutions for Class : 4 Mathematics 1.

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9.

According to the problem

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From the given figure, the number of horizontal lines is 9.

10. *

Tickets sold by Varun = Tickets sold by Vihan.

A B C D E F 1 3 4 6 8 9 F × B = 9 × 3 = 27 = 24 + 3 = (4 × 6) + 3 = (C × D) + B 2.

,

The number of one thirds in 72 = 72 × 3 = 216.

3.

,

P = 347 × 73 + 963 = 25331 + 963

Total tickets Varun sold on Monday and Tuesday = 17 + 30 = 47

= 26294

Tickets sold by Vihan on Tuesday = 22

26294 rounded off to the nearest 10 is 26290.

∴ Tickets sold by Vihan on Monday = 47 – 22 = 25

4.

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Ascending order is V, XX, XXXVI

11. *

72499 + 1 = 72500

5.

,

The order of the addends does not alter the sum.

12. +

For 8 →

e.g., 3 + 5 = 5 + 3 = 8 6.

)

5 match sticks are required.

The third multiple of 9 is 27, the fifth multiple of 4 is 20, the seventh multiple of 3 is 21 and the fourth multiple of 6 is 24.

13. *

AC + DE + GJ = (2 + 1 + 3) cm = 6 cm = BH

14. *

The product of 684 and 43 = 684 × 43

27 is the greatest among the given numbers. 7.

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A water tank has a capacity of 200 litres (approximately).

8.

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The place values of the two 7's in 73071 are 70000 and 70.

684 43 2052 + 2736 29412

29412 rounded to the nearest 100 is 29400.

Their product = 4900000

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15. +

22. *

Total number of guests = 75 No. of men = 45

Distance covered by moving to and from directly = 2 × 3 km

∴ No. of women = 75 – 45 = 30

30 2 = 75 5

∴ The required fraction =

16. +

17. )

18. *

Distance he covered in 5 days = 2 × 5 × 3 km

When a shape is tessellated there should not be any gap between the unit shapes in the tessellation. So, option (C) is the shape that cannot be tessellated.

= 5 × 6 km

A line of symmetry is a line that divides an object or a figure into two identical halves.

23. +

The number formed by the digit 6 on each number card is 660660.

24. +

If = 9,

The given digits are 7, 4, 9, 2 and 6.

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The largest 5-digit odd number that can be formed using the given digits is 96427 and the smallest is 24679.

= 9 × 6 = 54 are true.

The figure in option (D) is symmetrical as shown.

26. )

The given digits are 7, 6 and 8. The numbers that can be formed using each of them only once are 678, 687, 768, 786, 876 and 867, which are 6 in number.

27. *

Cost of 2 pencils =

The number of marbles Giri and John had at different times is shown in the given table.

∴ John had 30 – 9 = 21 marbles more than Giri.

Cost of 1 pencil =

14 = 7 × 2 ; 35 = 7 × 5;

=

49 = 7 × 7 ; 21 = 7 × 3;

6 ÷ 2 3 =

So, the given numbers are multiples of 7.

1 2 1×3 2 + = + 3 9 3×3 9 =

6

∴ The cost of 9 pencils = 9 ×

63 = 7 × 9 ; 42 = 7 × 6 and 28 = 7 × 4

21. +

= 9 + 6 = 15

25. ,

∴ X – Y = 71748

20. +

= 6,

×

∴ X = 96427 and Y = 24679

19. +

Distance from Mohit’s place to his office = 3 km.

3 2 3+2 5 + = = 9 9 9 9

28. *

250 g – 50 g = 200 g

29. ,

27 ÷ 9 3 = 90 ÷ 9 10

30. +

4 +1 = 4+5 N+1 Comparing the sum obtained with , N+5 we get N = 4.

60 = 1 2 3 4 5 6

3

27

× 60 × 30 × 20 × 15 × 12 × 10

In the given factors 12 is missing. Hence, the number P is 12.

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31. +

32. *

38. )

Area formula can be used for determining the amount of ground the bottom of the pool will cover.

(i) 705 ml = (705 ÷ 1000) l = 0.705 l

3 7 ? 0 3 – 1 2 1 6 8

(ii) 7050 ml = (7050 ÷ 1000) l = 7.05 l

2 5 2 3 5

∴ 705 ml = 0.705 l is the correct statement.

To find the missing number in the minuend, add the difference and the subtrahend i.e.,

39. +

7000 × 21 = 147000 8000 × 12 = 96000

3 7 4 0 3

∴ The product of 7000 and 21 (i.e., 147000) lies between 145000 and 155000.

So, clearly the missing number is 4. 1 week = 7 days

40. ,

Factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24 and 48, which are 10 in number.

231 7 ) 1617 14 21 21 007 –7 0

41. ,

None of the given letters can be tessellated.

42. +

474996 when rounded off to nearest hundred becomes 475000.

43. +

Three fourths of 28 months = = 21 months

= 231 34. ,

11 and 13 are prime numbers that differ by 2. So, they are twin primes.

35. +

Fraction of money spent on toy car = Fraction of money spent on shirt =

44. ,

∴ Difference = 4900 g – 3000 g = 1900 g

1 3

45. +

4 9

108 is divisible by both 6 and 9 as 108 = 6 × 18 and 108 = 9 × 12 So, it is a multiple of 6 and 9.

General Science

9 − 3− 4 2 = 9 9

Weight of the bag of flour = 13 kg 920 g

46. +

A leaf synthesises food for the plant.

47. ,

Ginger is a modified stem that stores extra food. ‘S’ includes modified stems.

48. *

Monkey, lizard and squirrels are tree dwelling or arboreal animals.

49. )

The nymph sheds its skin to transform itself into an adult. This process is called moulting.

50. +

Organ X is the stomach. It is the muscular part of the digestive system.

51. )

The microscope is used to observe microbes.

Number of packets = 4 ∴ Weight of each packet = 13 kg 920 g ÷ 4

= 13920 g ÷ 4 (Since 1 kg = 1000 g.) = 3480 g = 3 kg 480 g 37. ,

P = 4.9 kg = 4900 g Q = 3 kg = 3000 g

1 1 Fraction of money left = 1 − − 3 9 =

3 × 28 4

⇒ 21 months = 1 year 9 months (3 1 year = 12 months)

∴ No. of shoes manufactured in a day

36. *

5000 × 32 = 160000 6000 × 45 = 270000

2 5 2 3 5 + 1 2 1 6 8

33. *

1 litre = 1000 ml

The letter ‘S’ has no line of symmetry.

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52. *

95% of the air constitutes of oxygen and nitrogen.

71. *

The fleece of sheep, yak and camel is used to make wool.

53. )

Incisors help in cutting the food.

72. )

54. ,

In solids, the arrangement of molecules is tight.

We get heat and light energy from the sun.

73. )

55. *

The force which pulls a body towards the earth is called gravity.

A Mango tree is a produces that can make its own food.

74. +

56. +

Vitamins and minerals help us to fight disease causing germs and makes our body stronger.

Kidney filter out waste material from the blood.

75. *

Clouds are the non-living things that has no life.

57. ,

The leaves of desert plants are reduced to spines to prevent loss of water.

76. ,

Snakes, birds and frogs are egg laying animals.

58. *

Climber coils around the stems of other plants for and to get sunlight to make its food.

77. ,

Bolls or fruits of cotton are used to make cotton fibre.

78. *

Air occupies space.

79. +

Group of stars is called constellation.

80. ,

Kerosene is in the liquid state.

81. )

The capacity to do work is called energy. Energy is available in different forms such as heat energy, light energy etc.

82. ,

The sun, its planets and their moons make the solar system.

83. +

Cactus and camel live in desert habitat.

84. +

Egg → Larva → Pupa → Butterfly is the life cycle of butterfly.

59. ,

Goat is a herbivore.

60. ,

A tooth decay starts at the surface of the tooth and grows inward. When bacteria reaches the nerves within the pulp, it causes pain.

61. *

Vitamins are needed in small quantities.

62. +

An animal that hunts for its food is called predator.

63. *

The main aim of giving first aid is to save life.

64. +

In the given figure of solar system. Planet labelled R is the Jupiter.

85. )

65. +

We should measure the temperature of water before and after the experiment.

A solids has a strongest force of attraction between its molecules.

86. +

X represents heating.

66. ,

Digestion of food does not take place in large intestine.

87. +

A tadpole is the larva of a frog, it resembles the fish.

67. +

Herbivores feed on plants to obtain food. The plants prepare their own food by using solar energy.

88. +

The given animal is a tern. It migrates over long distances to get protection from extreme weather conditions.

68. +

The organism is the virus.

69. *

The tooth in the given figure is a canine.

89. ,

70. )

Wool is an animal fibre.

Air, water and sunlight are the basic needs of the plant.

90. )

Water lettuce is a floating aquatic plant and water lily is a fixed plant.

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