Class 4
National Level Science Talent Search Examination
Previous Question Papers
st
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(Code: 412)
(Set A - Code: 415)
(Set B - Code: 418)
(Set C - Code: 421)
Key & Solutions
Class–II
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NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION - 2015 (UPDATED) Paper Code: UN412
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NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Paper Code: UN415
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UNIFIED COUNCIL A n I S O 9 0 0 1 : 200 8 C e r t i f i e d
O r g a n is a t io n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Paper Code: UN 418 Solutions for Class : 4 Mathematics 1.
(C )
7.
(A)
= 5 the capacity of a glass 7 = and 6
+ +
Capacity of a glass = 3.65 l 5
Hence, the capacity of 2 glasses = 0.73 l 2 = 1.46 l = 1460 ml
2 1 3 2
=
=
22 1 3 3 2 23
Since,
we get
+ 1 + 6
8.
(B)
9.
(C )
=
=
7, 6
Amount he had at first =
7 6
= 10. (B)
3.
(B)
Given,
5.
(D)
(B)
2
38
Since 3 7 = 21, and
The missing digit is 3.
= 9,
= 3 9 = 27
11. (B)
Common factors of 20 and 32 are 1, 2 and 4 which are 3 in number.
12. (B)
P = 3.6 kg = 3600 g
=9 3=3
Q = 3.06 kg = 3060 g
Through two given points, we can draw
R = 3.060 kg = 3060 g
only 1 line.
S = 3 kg 6 g = 3006 g
Q Q=1
Hence, Q and R have the same mass.
R=1 6.
2 left.
36 +
523 7 = 3661
The greatest prime number less than 50 is 47. = 3 and
4
4
= 36 After buying 9 packets Aryan had
(C )
(A)
Cost of a biscuit packet = Cost of 9 packets = 9
2.
146 6 = 24R2
Number of marbles left = 2
7 1 6 = = =1 6 6 6
l
= 0.73
1 2 = 2 3
4 3 1 = = 6 6 6
4.
Capacity of a jug = 3.65 l
Given,
13. (D)
11 + 12 = 23, 12 + 13 = 25
The required fraction =
13 + 14 = 27 =
23 + 25 = 48, 25 + 27 = 52
The missing number = 100 – 48 = 52
=
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7 2 + 12 3
4 7 8 72 + = + 12 3 4 12 12 15 12
=
5 4
=1
1 4
A
14. (B)
23. (A)
B
F
C E
14987 = 10000 + 4000 + 900 + 80 + 7
D
24. (D)
The line segments in the given figure are AB, BC, CD, DE, FE, FA, AE, BD and EB which are 9 in number. 15. (B)
P : CD = 500 – 100 = 400 Q : CM = 1000 – 100 = 900 R : DC = 500 + 100 = 600
Smallest 5-digit number formed by different odd digits 13579.
S : MC = 1000 + 100 = 1100
S has the largest number..
The place value of 3 in 13579 is 3000. 16. (B)
Fourteen thousand nine hundred eighty seven = 14987
25. (B)
CI – IC = 101 – 99 = 2
Quantity of water in the pail l
LX – XL = 60 – 40 = 20 CL – LC is not possible because I, X, or C can be subtracted but not V or L.
= 1385 m
CX – XC = 110 – 90 = 20 is correct of all the given statements. 17. (B)
= 2048 m l
No. of beads collected by Preeti = 544
Quantity of water left = 5000 – (1385 + 2048) m l = 1567 ml
No. of beads collected by Kamala = 694 + 83 = 777
= 1 l 567 m l
Total num ber o f bea ds co lle cted b y them = 544 + 777 + 694 = 2015
26. (B)
8 4=8+8+8+8
27. (B)
4 and 9 do not have any common factor except 1.
28. (C )
Total time spent for all the three activities
205 6 = (200 + 5) 6 = 200 6 + 5 6
19. (C )
1 3 = 1 + + 1 hours 2 4
The prime numbers between 20 and 30 are 23 and 29.
Their sum is 23 + 29 = 52 20. (B)
3 3 = + + 1 hours 2 4
3 Fraction of salary given to his father = 5
3
6+3+4 = 4
2
Fraction of salary left = 1 5 = 5 =
820 (Given) =
His salary = = 21. (D)
820
5
hours
13 hours 4
1 hour = 60 minutes
2
2050
13 13 60 minutes hours = 4 4
1 m 5 cm + 1 m + 20 cm
= 13
= 105 cm + 100 cm + 20 cm = 225 cm
15 minutes
= 195 minutes
= 2 m 25 cm 22. (C )
l
water used to wash dishes = 2 l 48 m l
No. of beads collected by Rani = 544 + 150 = 694
18. (D)
l
= 5 = 5000 m water used for plants = 1 l 385 m l
o
Turning 270 right is to turn 3 times right by 90o . 1st 90o turn Chandni faces the school. 2 nd 90 o turn She faces the shopping mall. 3 rd 90 o turn She faces the Railway station.
29. (B)
1000 m make a kilometre.
30. (A)
The figure in option (A) is the required tessellation (one of the possibilities) of the given unit shape.
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31. (B)
38. (B)
Between 1 and 100. 6 appears 20 times. 6, 16, 26, 36, 46, 56, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76, 86, 96.
32. (A )
.... (1)
= 1 kg + 500 g + 250 g + 250 g
.... ( 2)
= 1 kg + 500 g + 250 g + 100 g
Total number of stamps = 836
+ 100g+50g
= Kamal’s collection + Hari’s collection
The distance between the centre of the circle to any point on it is called radius of the circle.
40. (C )
1 km – 200 m = 1000 m – 200 m
836 – 320 = 2(Hari’s collection So, 516 = 2(Hari’s collection).
....(3)
39. (B)
= (Hari’s collection)2 + 320
= 800 m
Number of stamps collected by Hari = 516 2 = 258
41. (D)
No. of stamps collected by Kamal = 258 + 320 = 578 33. (A)
2 kg = 1 kg + 500 g + 500 g
6 + 6 + 6 + 6 = 24; 36 6 = 6 36 – 6 = 30; 6 6 = 36
The 6 6 is the largest.
No. of books in a bag = 12
42. (A)
72 m 9 = 8 m
No. of bags required for 144 books = 144 2 = 12 4 cm
34. (B)
5 cm
5 cm
8m 8m 8m 8m 8m 72 m
10 cm
8m 8m 8m
5 cm
Distance between poles = 8 m. 9 cm
43. (D)
hrs
min
13 9
50 30
4
20
Perimeter = (10 + 4 + 5 + 5 + 5 + 9) cm = 38 cm
_
(or) Perimeter = 2(10 + 9) cm = 38 cm 35. (C )
Amount Krish had = Four
10 notes = 4 =
160 – 40 =
The duration from 09: 30 to 1 3: 50 is 4 hrs 20 min.
10 44. (B)
40
The mass of a chair = 2 kg 650 g = 2650 g The mass of a table = 2(the mass of a chair)
120
= 6
20
Hence, he has six 36. (C )
160
= 2 2650 g 20 notes.
= 5300 g = 5 kg 300 g
Three years ago, age of Sonu = 10 years
45. (A)
Present age of Sonu = (10 + 3) years
Diameter = 2 radius If radius is increased by 2 cm
= 13 years
Diameter = 2 (radius + 2 cm)
Age of Tanya = 13 + 4 = 17 years. 37. (B)
= 2 radius + 4 cm
1 hour = 60 minutes Required fraction =
Hence, the diameter increases by 4 cm. 48min 60 min
4 5
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68. (D)
General Science 46. (C )
Venus fly trap closes its leaves to trap insects.
47. (D)
The carrot is a root that contains stored food.
The correct combination is Caterpillar - butterfly, nymph - cockroach, tadpole-frog Maggot-housefly. p-III, q-IV, r-I, s-II.
69. (D)
Fish and crab breathe through gills.
70. (A)
Stomata are tiny pores present on the leaves of plants.
48. (B)
X is carbon dioxide and Y is oxygen.
49. (D)
Canines are called tearing teeth.
50. (A)
During evaporation water changes to water vapour.
71. (B)
Blood vessels and nerves are present in the pulp part of the tooth.
51. (B)
‘X’ is water in the liquid state and Y
72. (B)
Silk is obtained from silkworm.
52. (A)
marbles in solid state. Kerosene is insoluble in water.
73. (A)
Moving air has energy. Since moving air can make a pin-wheel move, it has energy.
74. (D)
Frictional force stops the moving ball.
75. (B)
X is dentine.
76. (B)
Water droplets are formed on the surface of juice bottle, which is taken out from a freezer is due to the moisture in the surrounding air.
77. (C )
In sugarcane food is stored in the stem.
78. (B)
Stick insects exhibit camouflage.
79. (D)
Tadpoles resemble the fish. They respires through gills.
80. (A)
Energy can be defined as the capacity to do work.
81. (C )
R represents the small intestine. Digested food is absorbed by the blood vessels present in the small intestine.
82. (D)
Cotton clothes do not catch fire easily.
83. (D)
On heating water gets evaporated.
84. (B)
Steam on cooling becomes water, which on cooling changes to ice.
85. (A)
The frog is an amphibian. It can live both on land and in water.
86. (D)
Mars is also called the red planet because the soil and rocks are red.
87. (A)
Leaves synthesise food and transport it to all parts of the plant.
88. (A)
Stagnant water breeds mosquitoes.
89. (C )
Stripes on the bodies of tigers help them in mixing with their surroundings and to catch their prey.
90. (D)
Animals need to reproduce to increase their number, maintain their race and to ensure that life exists on earth.
53. (D)
Venus is the brightest and the second plant in the solar system.
54. (D)
Mangrove plants grow in Marshy areas. Their roots come out of the soil to breathe in air.
55. (D)
Chlorophyll pigment is useful in performing photosynthesis in the presence of sunlight.
56. (B)
Pitcher plant is an insectivorous plant.
57. (B)
In the given figure, the plant is responding to the sunlight.
58. (C )
Banyan trees has aerial roots to support its branches.
59. (B)
Webbed feet are useful in swimming.
60. (B)
Canines are used for tearing the food. Canines are well developed in carnivores or flesh eating animals.
61. (A)
The earth takes one day to complete one rotation.
62. (C )
During photosynthesis light energy is converted to chemical energy.
63. (B)
During photosynthesis, oxygen and sugar are produced as products of photosynthesis. CO2 H O 2
64. (D)
Chlorophyll
Sunlight
sugar + oxygen
Q is moon. It is a satellite. It reflects light from the sun.
65. (B)
Sugar is a solid. Solids have definite volume and definite shapes.
66. (D)
A lotus plant has broad leaves to balance the plant.
67. (A)
Digested food is absorbed in the small intestine.
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UNIFIED CO UNCIL A n I S O 9 0 0 1 : 20 08 C e r t i f i e d
Or g an is at io n
NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION (UPDATED) Paper Code: UN 421 Solutions for Class : 4 Mathematics 1.
2.
(C)
(C)
1
2
1
1
2
3
2
1
1
2
3
4
3
2
1
1
2
3
4
5
4
3
1
2
3
4
5
2 5
Fifth multiple of 7 = 7
Seventh multiple of 5 = 5
3.
(B)
4.
(C)
7.
(A)
If the product of 80 whole number is 80, then their sum can’t be 80.
8.
(C)
Multiples of a number are obtained when a given number is multipled by 1, 2, 3 and so on. So, the smallest non-zero multiple of a number is the number itself .
9.
(C)
Fraction of pizza Maneesh at =
1 4
3
2
1
5 = 35
7 = 35
3 16
Their difference = 35 – 35 = 0
Fraction of pizza his brother ate
3
Fraction of pizza they eat altogether
+
4
2
=
3+2
4
4
A
5
is an improper fraction
4
=
E
10. (D)
G
I
3 8
= 3 +3 16 8
C LB D J HF
K
=
=
3+6 9 = 16 16
= 777 + 555 + 333 + 111 – 666 – 444 – 222 = 777 – 666 + 555 – 444 + 333 – 222 + 111
A, B, C, D, E, F, G, H, I, J, K and L, are the 12 corners in the given figure. 5.
(A)
= 111 + 111 + 111 + 111 = 444
T.Th Th H T O 9
6
11. (A)
4 3 1
The shape given in option (A) can be tessellated, as shown.
In 96431, 6 is in the thousands place. It stands for 6000 which can be written as 6 100 10. So, the number that should be placed in the box is 10.
6.
(D)
P is meaningless as VIX or VXI is not correct. Q is XVI and R = XIV The difference between Q and R is 16 – 14 = 2.
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12. (C)
L
Th
H
T
20. (A)
O
The shading can be redrawn as shown.
468543
Place value of 4 = 4
ten thousands
The digit ‘6’ is in the place. 13. (D)
100000 = 400000
Given each square represents 1 cm 2 .
The least number having factors 2, 5, 6 = 30 The least number having factors 4, 8 = 8
14. (D)
P = 30, Q = 8
The area of the shaded part is 29 cm2.
21. (C)
Given
+
+
Thirty-five and four hundredths = 35.04 The decimal that shows Sharan’s time = 35.04 seconds.
+
8
8
6=2
6 = 48 = 2
(Since 6 = 2 16. (A)
Hence, 22. (C)
24
The fraction is
26
= 52
10 5 = . Hence, the 16 8
23. (C) 1 kg
Between the 16 dots in border X, there are 16 lengths which needed 16 m of rope. In border Y, there are 24 lengths between the 24 dots. So, it needs 24 m of rope.
kg3
19. (C)
The perimeter of the rectangle formed = 2(24 + 2) =2
required figure is in option (D). 18. (D)
Arrange all the 12 squares side by side.
In the figure in option (D), 10 out of 16 triangles are shaded.
= 1+3=4
+
2
The sum of 2 positive whole numbers is greater than their product, if one of the number is 1.
17. (D)
=7–1=6
=3
If a number is multiplied with 1, the product is the number itself, but when 1 is added to a number, the sum is 1 more than the number.
=7
+
20 = 20 = (21 > 20)
=9–7=2
+1+
3.)
= 9
=1
8
Consider 1, 20 as two positive whole numbers. 1 + 20 = 21, 1
+
=9
+
8 3
+
=7
+7+
15. (C)
+
P + Q = 30 + 8 = 38
Only shape Z has a square shaped face. 24. (A)
3 kg
kg4
3 kg
The scale is balanced by placing 7 kg
on each side of the scale. Number of books = 18 2 groups of 9 = 2
9 = 18
3 groups of 6 = 3
6 = 18
Rahul can stack the books in 2 groups of 9 (or) 3 groups of 6.
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25. (B)
40 = 1
40
2
2
20
3
4
10
24
5
8
The value of the given expressions is 12. Of the given options = 72 6. = 12. Hence, the required expension is 72 6.
32. (D)
3 of total 8
Fraction of sugar used =
Fraction of sugar left =
1
3835 = 8 8
=
The difference obtained when zero is subtracted from a number is the number itself .
34. (A)
Time taken to complete homework = 30 min. The minute hand is on 9 when he started after 30 minutes it move to 3.
8
= 625 g (Given)
Total quantity of sugar = 625
= 125 27. (B)
35. (C)
The prime number next to 11 is 13. The sum when 11 is added to 13 is 11 + 13 = 24.
36. (B)
1200 = 1000 + 100 + 100 = MCC
8 5
8 = 1000 g
700 = 500 + 100 + 100
Weight of the bag of wheat flour = 82 kg 14 g
= DCC Similarly, 120 = 100 + 10 + 10
Quantity of flour used = 26 kg
= CXX
Quantity of flour remaining in the bag = 82 kg 14 g – 26 kg = 56 kg 14 g
28. (C)
The missing numbers are C and X.
21 and 31 have no common factor other
m 7
co-prime
than 1. So, they are called numbers.
30. (C)
38. (D)
The least 3-digit number is 100.
=
half of his money (i.e., 10). Total amount he had = 2 10 =
34
34 ) 476 (14 34
39. (B)
0
The other number is 14.
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20 0.
The descending order of the given numbers is 86415, 81074, 80000, 9469.
136 –136
10
As Golu spent half of his money on T-shirt, the amount left is equal to exact
Given product = 476
Amount spent on T-shirt = Half of his money Amount left after buying T-shirt = (2 + 8)
The number of 3-digit numbers = 999 – 100 + 1 = 900
The other number = 476
Perimeter = (5 + 7 + 3 + 3 + 2 + 10) m = 30 m
1 of the pizza = 4. 3
The largest 3-digit number is 999.
31. (B)
2m
10 m
Number of piece in
3m
(5 – 2) m =3m 3m
1 3
m 3
37. (A) 5m
29. (B)
2 = 12
33. (C)
quantity
4 = 12
40 is the least 2-digit number that has 2, 5 and 8 as factors.
26. (D)
6 = 12
40. (A)
Number sticks picked in 10 min = 18
50. (B)
Plants take in carbon dioxide released by animals during day time for the process of photosynthesis and they release oxygen which is utilised by living organisms for respiration.
51. (C)
A sugarcane plant is propagated by its stem.
52. (D)
A tooth decay starts at the surface of the tooth and grows inward. When bacteria reaches the nerves within the pulp, it causes pain.
53. (C)
Raincoat is a water proof and nonabsorbent material.
54. (B)
Cockroach life cycle has three stages. Egg Nymph Adult
55. (B,D)
Zebra and grasshopper merge with their surroundings.
Number of sticks picked in 60 min =
18 × 60 = 108 10
( 1 hour = 60 minutes.) Deepu could pickup 108 sticks in 1 hour.
41. (C)
542809 = 500000 + 40000 + 2000 + 800 + 9
42. (D)
Weight of 1 grain of rice = 0.01 g. we know that 1 kg = 1000 g. 0.01 g
43. (B)
100000 = 1000 g = 1 kg
In 1 kg of rice there are 100000 grains.
Factors of 38 = 1, 2, 19, 38
In some places like savannahs lions can also merge with their surroundings.
Factors of 48 = 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 Factors of 58 = 1, 2, 29, 58
56. (A)
Incisors helps to cut the food.
Factors of 68 = 1, 2, 4, 17, 34, 68
57. (D)
Among the given options 48 is divisible by most whole numbers.
The gullet is present between the mouth and stomach.
58. (C)
Herbivores feed on plants to obtain food. The plants prepare their own food by using solar energy.
59. (A)
Turtle uses its shell for protection.
60. (C)
Heat is a form of energy which changes solids to liquids and liquids to gases. For
44. (B)
Quantity of cement in 12 bags = 996 kg Quantity of cement in 1 bag = 996 kg = 83 kg
45. (C)
= 24 = 1
2
3
8
4
6
12
24
example, ice
12
1 + 24 = 25; 2 + 12 = 14; 3 + 8 = 11; 4 + 6 = 10 = 4,
= 6, since the sum of
4 and 6 is the smallest value.
+
water
heat
water
vapour 61. (A)
A cabbage is a leaft part of the plant.
62. (A)
Ice is a solid. Definite shape and volume is present in solids.
63. (C)
The force responsible for the coconut to fall on the ground is gravitational force.
64. (C)
Wheat grain is a monocotyledon seed.
65. (C)
The water droplets food on the surface of cold soft drink bottle is due to condensation of watervapour present on the cold surface in the air.
66. (B)
We get oil from both plants and animals sources.
heat
= 4+6=
10
General Science 46. (C)
In the given figure of solar system, planet labelled R is the Jupiter.
67. (C)
In a battery energy is stored in the form of chemical energy.
47. (A)
Prickly pear is a desert plant.
68. (A)
48. (B)
Mouth foodpipe stomach small intestine large intestine shows the correct sequence of food.
Claypot is made from clay which is a nonliving material. Pepper, paper and cane chair are obtained from living objects, i.e., plants.
49. (B)
Climber coils around the stems of other plants for support and to get sunlight to make its food.
69. (B)
The three states of matter are solids, liquids and gas. Steam is a gas, juice is a liquid and pencil is a solid.
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70. (B)
La rg e i ntest in e a bso rb s w ater f rom indigested food.
71. (D)
Diarrhoea can occur due to the drinking of contaminated water.
72. (A)
73. (A)
80. (A)
Boiling kills the germs in water.
81. (C)
Tall and straight trees with needle like leaves without flowers are usually found in hilly areas.
Water hyacinth is a floating plant and hydrilla is a underwater plant.
82. (D)
Clay can hold the highest amount of water due to its sticky nature.
Living organisms require water to survive. Water is a non-living thing.
83. (A)
Rain is the precipitation form of water.
84. (B)
Webbed feet helps to swim easily in water.
85. (C)
Rat is an omnivore. It eat both plant, products and animals.
86. (D)
Oxygen gas is photosynthesis.
87. (A)
An iron ball lying on the ground has no force acting on it. Force makes a body move.
88. (C)
Canines help in tearing food.
89. (C)
If we touch electrical appliances with wet hands. It may cause a electric shock.
90. (B)
Tadpole undergoes changes the most to become an adult frog.
74. (B)
The given figure is water cycle.
75. (B)
Monkey, whale and bat are mammals. They give birth to their young ones.
76. (D)
Telescope is used to observe the things that are far away.
77. (D)
All living organisms like plants and animals are interdependent.
78. (B)
Vitamin C is found in goose berry and citrus fruit. It prevents scurvy, heal wounds and preserves health of the skin.
79. (C)
with the surroundings and help them to catch their prey and protect from hunters.
The spots of leopard helps them to merge
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produced
during
