National Science Olympiad

Class

8

National Science Olympiad TM Section – I (Mental ability) : Rational numbers, operation on rational numbers, decimal representation of rational numbers, exponents, direct and inverse variations, percentage and its application, algebraic expression, factorization of algebraic expressions, linear equation in one variable, more about triangles, congruent triangles, quadrilaterals, circles, area of rectangular paths, surface area and

Syllabus

SAMPLE QUESTION PAPER

volumes, statistics, square and square roots, cube and cube roots. Section – II (Science) : The universe, Soil & air, Transformation of substances, Structure of atom, Metals and non-metals, Carbon, Cellular level of organisation, Micro-organisms & common diseases, Light, Magnetism & electricity at work, Sources of energy, Food production & management.

Comprehensively covers syllabus from CBSE Board, ICSE, Maharashtra Board, Andhra Pradesh Board, Tamilnadu Board & Other state boards

MENTAL ABILITY 1.

A contest began at noon one day and ended 1000 minutes later. At what time did the contest end? (A) 10:00 p.m. (B) midnight (C) 2:30 a.m. (D) 4:40 a.m.

2.

Which of the following sets of whole numbers has the largest average? (A) multiples of 2 between 1 and 101 (B) multiples of 3 between 1 and 101 (C) multiples of 4 between 1 and 101 (D) multiples of 5 between 1 and 101.

3.

Beena used a calculator to find the product 0.075 × 2.56. She forgot to enter the decimal points. The calculator showed 19200. If Beena had entered the decimal points correctly, the answer would have been (A) 0.0192 (B) 0.192 (C) 1.92 (D) 19.2.

4.

Two cyclists, k km apart, and starting at the same time, would be together in r hours if they travelled in the same direction, but would pass each other in t hours if they travelled in opposite directions. The ratio of the speed of the faster cyclist to that of the slower is (A)

5.

r +t r −t

(B)

r r −t

(C)

r +t r

(D)

The shaded area formed by the two intersecting perpendicular rectangles, in square 2 units is (A) 23 (B) 38 (C) 44 (D) 46.

r . t

3 3 8 10

SCIENCE 6.

A Brief History of Time is the title of a book written by : (A) Albert Einstein (B) Stephen Hawking (C)

7.

Which of the following can produce a virtual image ? (A) plane mirror (B) concave lens (C) convex lens (D) all of these

8.

A bar magnet with poles N and S marked is freely suspended. Then the end marked N would point towards (A) the south magnetic pole of the earth (B) the south geographic pole of the earth (C) the north magnetic pole of the earth (D) the north geographic pole of the earth

1 Class 8

Hendrick Lorentz

(D) Isaac Newton

9.

Ball (A) (B) (C) (D)

A is thrown horizontally and Ball B is dropped from the same height at the same moment. ball A reaches the ground first ball B reaches the ground first ball A has the greater velocity when it reaches the ground ball B has the greater velocity when it reaches the ground.

10. Figure on the right shows the colour seen on a wall in white light. Which of the figure A - D shows the wall as it would appear in blue light? Black

(A)

Blue Green

(B)

Yellow

Magenta

Black

(C)

Black

Blue

Magenta

(D)

Black

Black

Red Green

Turquoise Green

11. A concave mirror may be used for all except one of the following. This is (A) a magnifying mirror (B) a torch reflector (C) a reflecting telescope (D) a car rear view mirror. 12. How does the eye change in order to focus on near or distinct objects? (A) the lens moves in or out (B) the retina moves in or out (C) the iris changes colour (D) the lens bulges or relaxes. 13. Aluminium is obtained by (A) heating Al2O with iron (B) heating Al2O 3 with coke (C) electrolysing a solution of Al2 O3 in molten cryolite (D) electrolysing fused AlCl 3. 14. Which of the following statements is true with respect to diamond ? (A) The carbon atoms are connected to each other by metallic bonds. (B) In the diamond crystal, the carbon atoms are very loosely packed. (C) Each carbon atom in the crystal is surrounded by four others at the corners of a regular tetrahedron. (D) It is a very soft substance. 15. Under Indian space programme, the abbreviation GSLV stands for (A) Geosynchronous Satellite Launch Vehicle (B) Global Satellite Link Vehicle (C) Geostationary Solar Light Vehicle (D) none of these 16. If there were no organic life on the Earth, the amount of oxygen in the atmosphere will (A) remain unchanged (B) be approximately hundred percent (C) be almost nil (D) be approximately fifty percent. 17. Phenomenon where the pollutants pass in the higher concentration through the food chain and accumulate to the maximum in the final consumer is called (A) biological degradation (B) biological magnification (C) eutrophication (D) biogeochemical cycle. 18. A vaccine is usually given (A) at any time (B) at the time disease causing germs enters the body (C) before the symptoms of the disease appear (D) after the disease has appeared.

2 Class 8

19. Column A represents the theories of evolution and column B represents their propounder. Match column A with column B from the codes given below. Column A Column B (a) Use and disuse theory (i) Louis Pasteur (b) Survival of fittest (ii) Van Helmont (c) Life comes from pre-existing cells (iii) Jeans Lamarck (d) Theory of spontaneous generation (iv) Charles Darwin. Codes : (A) a - ii, b - iv, c - iii, d - i (B) a - iii, b - iv, c - i, d - ii (C) a - iv, b - i, c - iii, d - ii (D) a - i, b - iii, c - ii, d - iv. 20. Select the correct choice from the codes given. (a) The female gamete is called zygote. (b) Twins are always identical. (c) Gregor Mendel is the Father of Genetics. (d) Sex determination in human beings occur by X and Y chromosomes. Codes : (A) false, false, true, true (B) true, true, false, false (C) false, true, true, false (D) true, true, true, false. 21. Mark the odd one out. (A) colourblindness

(B) hexadactyly

(C)

22. Some basic steps are needed in agricultural practice. Which of (1) preparation of the soil (2) (3) irrigation (4) (5) tilling (6) (7) manuring. (A) 1, 5, 4, 7, 6, 3, 2 (B) (C) 1, 3, 5, 2, 4, 6, 7 (D) 23. Given below are characteristics (Column A) Characteristics (a) Wingless insect (i) (b) Flightless bird (ii) (c) Limbless reptile (iii) (d) Limbless animal (iv) (v) Codes: (A) a - i, b - iii, c - ii, d - v (B) a - ii, b - i, c - iv, d - v (C) a - ii, b - i, c- iii, d - iv (D) a - iii, b - i, c - iv, d - ii.

haemophilia

(D) night blindness.

the following given as A, B, C, D is the right sequence? harvesting broadcasting weeding 1, 3, 5, 6, 4, 2, 7 1, 5, 6, 2, 4, 7, 3.

(column A) of the animal (column B). Mark the correct match from the codes. (Column B) Animals Kiwi Silver fish Turtle Snake Fish

24. Study and cultivation of vegetables is called (A) agriculture (B) horticulture

(C)

apiculture

(D) floriculture.

25. If a metal wire gauze is placed on a bunsen flame, the flame does not pass through the gauze. This is because the gauze (A) obstructs the gas due to small openings (B) absorbs the gas (C) is a good conductor of heat (D) none of these 26. Each angle of a rectangle is trisected. The intersections of the pairs of trisectors adjacent to the same side always form (A) a square (B) a rectangle (C) a parallelogram with unequal sides (D) a rhombus.

3 Class 8

A

C D

0 0

28. Graphite is a good conductor of electricity because (A) it is a very soft substance (B) it has hexagonal rings with carbon atoms at the corners (C) there are some free electrons which can move through the crystal lattice (D) the distance between the planes of hexagonal rings is comparatively very large. 29. Two identical vessels I and II shown in the figure contain water at 4°C and at the same level. Vessel I is heated while vessel II is cooled. The water level in (A) I will go up and that in II will come down (B) II will go up and that in I will come down (C) both I and II will go down (D) both I and II will go up.

B

Velocity

27. Given the graph of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion ? (A) A (B) B (C) C (D) D

Time

II

I

30. Acid rain is caused by pollution of environment by (A) carbon dioxide and nitrogen (B) carbon monoxide and carbon dioxide (C) ozone and carbon dioxide (D) nitrous oxide and sulphur dioxide.

JJJ

ANSWERS 1. (D) 11. (D) 21. (D)

2. (D) 12. (D) 22. (A)

3. (B) 13. (C) 23. (B)

4. (A) 14. (C) 24. (B)

5. (B) 15. (A) 25. (C)

6. (B) 16. (A) 26. (D)

4 Class 8

7. (D) 17. (B) 27. (D)

8. (A) 18. (C) 28. (C)

9. (C) 19. (B) 29. (D)

10. (B) 20. (A) 30. (D)