class-8
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Class 8 1
SOF
LEVEL-II The actual test paper has 50 questions. Time allowed : 60 minutes. There are
2 sections : 15 questions in section I and 35 in section II.
SYLLABUS
Section – I (Mental Ability) : Rational Numbers, Operation on Rational Numbers,
Decimal Representation of Rational Numbers, Exponents and Powers, Direct and
Inverse Variations, Comparing Quantities, Algebraic Expression, Factorization of Algebraic
Expressions, Linear Equation in One Variable, More About Triangles, Congruent Triangles,
Quadrilaterals, Circles, Mensuration, Statistics, Arithmetic Ability, Squares and Square
Roots, Cubes and Cube Roots, Problem Based on Figures, Find Odd Numeral Out,
Series Completion, Coding-Decoding, Mathematical Reasoning, Analytical Reasoning,
Mirror Images, Embedded Figures.
Section – II (Science) : Crop Production and Management, Microorganisms, Synthetic
Fibres and Plastics, Metals and Non-metals, Coal and Petroleum, Combustion and
Flame, Conservation of Plants and Animals, Cell, Reproduction in Animals, Force and
Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena,
Light, Stars and Solar System, Pollution of Air and Water.
8 SAMPLE PAPER
CLASS
2 Class 8
MENTAL ABILITY
1. Which of the following is the highest value? (A) 12 9 (B) 10 11 (C) 11 10 (D) All are same
2. A square and a rectangle each has a perimeter of 48 m. The difference between the areas of two figures is 4 m 2 . The dimensions of the rectangle are ________ . (A) 20 m, 4 m (B) 18 m, 6 m (C) 14 m, 10 m (D) 16 m, 8 m
3. If a x = b y = c z = abc, then 1 1 1 + + = x y z
(A) –1 (B) xyz (C) 1 (D) 1xyz
4. Reflect the figure across the yaxis.
Which is most likely the new figure? 1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7 7 6 5 4 3 2 1 x
y
x′
y′
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7 7 6 5 4 3 2 1 x′
y
y ′
x
(A)
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7 7 6 5 4 3 2 1 x
y
x′
y ′
(B)
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7 7 6 5 4 3 2 1 x
y
x′
y ′
(C)
1 2 3 4 5 6 7
1 2 3 4 5 6 7
1 2 3 4 5 6 7 7 6 5 4 3 2 1 x′
y
y ′
x
(D)
5. In the diagram, MN and KL are straight lines. Which point among P, Q, R, S lies on both perpendicular bisectors of MN and KL? (A) P
M
P R
N
K
L
S Q
(B) Q
(C) R
(D) S
6. Five friends are standing in a row facing South. Aman is standing to right of Deva, Chandan is in between Deva and Ekta. Bobby is standing extreme right. Who is standing exactly in the middle? (A) Aman (B) Chandan (C) Deva (D) Ekta
7. Vipul added a support to his metal shelves. If ∠SMO measures 45°, what is the measure of ∠STN? (A) 135°
W S
O M
T P
N (B) 180° (C) 45° (D) 90°
Class 8 3
8. Which statement about the volume of the two pyramids shown below is true? (Volume = Area of base × height) (A) The volumes of Pyramid II and Pyramid I are the same. (B) The volume of Pyramid II is 10 times the volume of Pyramid I.
6 cm 5 cm
5 cm
5 cm 4 cm
6 cm
Pyramid I Pyramid II
(C) Pyramid II has 10 cubic cms more volume than Pyramid I. (D) Pyramid II has 30 cubic cms more volume than Pyramid I.
9. This is a standard set of dominoes. The dominoes are turned over and shuffled thoroughly and one is selected randomly. What is the probability that the total number of spots shown in the one chosen will be greater than 6?
(A) 11 28 (B)
4 9
(C) 3 7 (D)
2 7
10. If 1 2x+ 3 2 1 ( 4) = ,
32 then x =
(A) –2 (B) 4 (C) –6 (D) –4
SCIENCE
11. Ali wants to conduct an experiment to show how friction can be reduced by applying different lubricants. An experiment is set up as shown below. Which of the following must be kept constant in order for the experiment to be fair? (i) Type of ramp used (ii) Type of car used
toy car
ramp (iii) Location of the experiment (iv) Position of the car
(v) Amount of lubricant (vi) Type of lubricant
(A) (i), (ii), (v) and (vi) only (B) (i), (ii) and (iv) only (C) (ii), (iii) and, (v) only (D) (i), (ii), (iv) and (v) only
12. One cannot see through fog because (A) Fog absorbs light (B) The refractive index of fog is infinity (C) Light suffers total reflection on the droplets in fog (D) Light is scattered by the droplets in fog
13. StatementI : A plane mirror produces virtual, erect image of the object. StatementII : Plane mirror has finite focal length. (A) Both Statements I and II are true and Statement II is correct explanation for Statement I. (B) Both Statements I and II are true but Statement II is not a correct explanation for Statement I. (C) Statement I is true and Statement II is false. (D) Statement I is false and Statement II is true.
14. If a body is allowed to fall freely from a height, its speed increases continuously. It is because (A) Air does not exert frictional force (B) Magnetic force of earth increases its speed (C) Gravitational force of earth increases its speed (D) Pressure of air forces it downward
15. X and Y can be Plastics
Thermosetting Thermoplastics
X Y
X Y (A) Polythene Bakelite (B) PVC Polythene (C) PVC Melamine (D) Melamine PVC
4 Class 8
16. Zone of partial combustion is Zone I Zone II
Zone III (A) Zone I (B) Zone II (C) Zone III
(D) All zones give complete combustion
17. P and Q can be respectively Oxides
Turn blue litmus red Turn red litmus blue
P Q
(A) Acidic oxide, basic oxide (B) Nonmetallic oxide, Metallic oxide
(C) SO 2 , MgO
(D) All of these
18. Match the following : Column I Column II
(a) LPG (i) Nonluminous flame (b) Outer zone of candle (ii) Inflammable substance (c) Alcohol, nylon fibres (iii) Rapid combustion (d) Fire crackers (iv) Spontaneous combustion (A) (a) (iii), (b) (i), (c) (ii), (d) (iv) (B) (a) (i), (b) (iii), (c) (ii), (d) (iv)
(C) (a) (iv), (b) (i), (c) (ii), (d) (iii) (D) (a) (iv), (b) (ii), (c) (i), (d) (iii)
19. Red Data Book is the source book which keeps a record of all the endangered animals and plants. The organization which is responsible for maintaining Red Data Book is
(A) IUCN (B) CITES (C) WWF (D) IBWL
20. In which labelled part of the given figure, development of baby takes place?
(A) (i)
(i)
(ii)
(iii)
(iv) (B) (ii)
(C) (iii)
(D) (iv)
21. The part X in the given figure is responsible for
(A) Deep voice
(B) Change in body shape X
(C) Produces thyroxine
(D) None of these
22. The two chromosomes named X and Y are called sex chromosomes. If Y is being replaced by X in the given figure, then the resulting zygote would develop into
(A) A male child (B) A female child
Y
(C) A child with abnormalities (D) Either (A) or (C)
Class 8 5
23. Which graph shows changes that occur in a river after being polluted by sewage?
conc
entration
of nitrog
en com
poun
ds
P
distance downstream sewage
added
0 conc
entration
of oxyge
n
Q
distance downstream sewage
added
0
number o
f bacteria
R
distance downstream sewage
added
0
number o
f fish S
distance downstream sewage
added
0
(A) P (B) Q (C) R (D) S
24. Water which is suitable for drinking is called potable water. It is essential to purify water before drinking. Which of the following methods are used to purify water? (i) Use of a candle type filter (ii) Boiling (iii) Addition of chlorine tablets to water (iv) Addition of bleaching powder to water
(A) (i) and (ii) (B) (i), (ii) and (iii) (C) (ii) and (iii) (D) All of these
25. Which of the following statements are correct?
(i) Alexander Fleming in 1929, discovered the antibiotic penicillin
(ii) Edward Jenner in 1876 discovered the bacterium (Bacillus anthracis) which causes anthrax disease
(iii) Robert Koch in 1798 discovered the vaccine for small pox
(iv) Louis Pasteur in 1857 discovered fermentation
(A) (i) and (ii) (B) (ii) and (iii) (C) (i) and (iv) (D) (i), (ii), (iii) and (iv)
SPACE FOR ROUGH WORK
6 Class 8
ANSWERS KEYS 1. (B) 2. (C) 3. (C) 4. (A) 5. (B) 6. (C) 7. (C) 8. (D) 9. (C) 10. (D) 11. (D) 12. (D) 13. (C) 14. (C) 15. (D) 16. (B) 17. (D) 18. (A) 19. (A) 20. (B) 21. (A) 22. (B) 23. (A) 24. (D) 25. (C)
SAMPLE ANSWER SHEET 1. NAME : If your name is SACHIT A IYER, then you should write as follows :
2. FATHER'S NAME : If your father's name is SATISH KUMAR SHARMA, then you should write as follows :
S A C H I T A I Y E R
S A T I S H K U M A R S H A R M A
3. SCHOOL CODE Write your school code i.e. if your school code is MH0547 darken as follows :
A B C D E F G H I J K L
N O P Q R S T U V W X Y Z
M A B C D E F G
I J K L M N O P Q R S T U V W X Y Z
H
1 2 3 4 5 6 7 8 9
0 5 4 7 SCHOOL CODE
1 2 3 4
6 7 8 9
1 2 3
5 6 7 8 9
1 2 3 4 5 6
8 9
Darken the circle
4. CLASS If you are in Class 10, then you should darken as follows :
5. ROLL NO. If your roll no. is 587, then you should write and darken the circles as follows :
0
2 3 4 5 6 7 8 9
1 0
1 2 3 4
6 7 8 9
1 2 3 4
0
6 7 8 9
5 8
1 2 3 4
6 7
9
1 2 3 4 5 6
8 9
7 CLASS ROLL NO.
5
0
5
0 Darken the circle
0 0 0
6. GENDER
Male
If you are a boy, then darken
circle
GENDER
MALE FEMALE CORRECT way to darken the circle
W ONG R way to darken the circle P ×
MARK YOUR ANSWERS WITH HB PENCIL/BALL POINT PEN (BLUE/BLACK)
7. If your choice for Answer 1 is C, then you should darken the circle as follows : 1.
1. 2. 3. 4. 5. 10.
15.
9.
14.
8.
13.
7.
12.
6.
11. 20. 19. 18. 17. 16. 25. 24. 23. 22. 21.
National Science Olympiad
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