Science Olympiad Practice Test 1 — NSO-style (Class 9)

Q4. Kiran walks 6 km towards the north. She turns right and walks 8 km. Then she turns right again and walks 12 km. How far is she from her starting point now, and in which direction?

Q5. In a row of 40 students, Meena is 14th from the left end and Arjun is 17th from the right end. How many students are there between Meena and Arjun?

Q6. What is the smaller angle between the hour hand and the minute hand of a clock at 4:40?

Q7. A mirror is placed along the line MN. Which figure shows the mirror image of the given letters and number?

Q8. A square sheet of paper is folded in half by bringing its left half over onto its right half. It is then folded in half again by bringing the top half down onto the bottom half. A hole is punched through the folded sheet as shown. What does the sheet look like when it is completely unfolded?

Q9. How many triangles are there in the figure below?

Q10. Statements: All pens are books. Some books are bottles.
Conclusions: I. Some pens are bottles. II. Some bottles are books.
Which conclusion(s) follow from the statements?

Q11. A liquid boils at 351 K. What is its boiling point on the Celsius scale?

Q12. Which of these would slow down the evaporation of water from wet clothes on a clothes line?

Q13. Two liquids mix completely with each other. Their boiling points differ by only 15 K. Which method is best for separating them?

Q14. A beam of light is passed through each of these in a dark room. In which one will the path of the beam be clearly visible?

Q15. 25 g of sugar is dissolved in 175 g of water. What is the concentration of the solution in mass by mass percentage?

Q16. How many molecules are present in 11 g of carbon dioxide (CO₂)? (C = 12 u, O = 16 u, Avogadro constant = 6.022 × 10²³ per mole)

Q17. The valency of aluminium is 3 and that of the sulphate ion is 2. What is the chemical formula of aluminium sulphate?

Q18. A neutral atom has 17 electrons and a mass number of 35. How many neutrons does it have, and what is its valency?

Q19. Calcium-40 (atomic number 20) and argon-40 (atomic number 18) are an example of

Q20. In Rutherford's gold foil experiment, most of the fast-moving alpha particles passed straight through the foil. What did this show?

Q21. Hydrogen and oxygen always combine in the ratio 1 : 8 by mass to form water. What mass of water is formed when 3 g of hydrogen reacts completely with oxygen?

Q22. Apart from plastids, which cell organelle has its own DNA and ribosomes?

Q23. A fresh leaf peel is placed in a concentrated salt solution for some time. What is seen under the microscope?

Q24. The diagram shows a plant cell. Which labelled part is made mainly of cellulose?

Q25. Which tissue is responsible for the increase in length of the stem and the root of a plant?

Q26. Which component of xylem is made of living cells?

Q27. Which connective tissue joins one bone to another bone at a joint?

Q28. Which type of tissue has cells that are cylindrical, branched, striated and uninucleate, and contracts rhythmically without our control throughout life?

Q29. Which of these is a rabi crop, sown in winter and harvested in spring?

Q30. Which of these diseases is caused by a protozoan?

Q31. In the nitrogen cycle, certain bacteria convert nitrates in the soil back into nitrogen gas. This process is called

Q32. The velocity–time graph of a car is shown. What total distance does the car cover in the 15 seconds?

Q33. A car moving at 72 km/h is brought to rest with uniform retardation in 5 s. How far does it travel while stopping?

Q34. An athlete runs around a circular track at a constant speed. Which statement about her motion is correct?

Q35. A bullet of mass 50 g is fired from a gun of mass 4 kg with a velocity of 200 m/s. What is the recoil velocity of the gun?

Q36. A car of mass 1500 kg speeds up from 10 m/s to 25 m/s in 5 s. What is the average force acting on it?

Q37. The mass of each of two objects is doubled and the distance between them is halved. The gravitational force between them becomes

Q38. An astronaut has a mass of 60 kg on the Earth, where g = 9.8 m/s². What are her mass and weight on the Moon? (Gravity on the Moon is one-sixth of that on the Earth.)

Q39. A stone is dropped from the top of a cliff and reaches the ground after 3 s. How high is the cliff? (Take g = 10 m/s² and ignore air resistance.)

Q40. A brick of weight 30 N measures 20 cm × 10 cm × 5 cm. What is the greatest pressure it can exert when resting on a table?

Q41. A motor pump lifts 500 kg of water to a tank 12 m high in 20 s. What is the power of the pump? (Take g = 10 m/s².)

Q42. A boy claps his hands near a cliff and hears the echo 2 s later. If the speed of sound in air is 340 m/s, how far away is the cliff?

Q43. A tuning fork of frequency 500 Hz produces sound in air, where sound travels at 340 m/s. What is the wavelength of the sound?

Q44. The diagram shows two sound waves. Which statement is correct?

Q45. Which of these sound frequencies is ultrasonic?

Q46. A solid object weighs 12 N in air and 8 N when fully immersed in water. What will it weigh when fully immersed in a liquid of relative density 0.8?

Q47. A ball is thrown vertically upwards at 20 m/s from the top of a tower 25 m high. After how long does it hit the ground at the foot of the tower? (Take g = 10 m/s² and ignore air resistance.)

Q48. Which of these contains the largest number of atoms? (H = 1 u, C = 12 u, O = 16 u)

Q49. Read these statements about plant tissues.
(i) Sieve tubes and companion cells are parts of phloem.
(ii) Meristematic cells have large central vacuoles.
(iii) Cork cells have suberin in their walls, which makes them impervious to gases and water.
(iv) Stomata help in transpiration and in the exchange of gases.
Which statements are correct?

Q50. A ball of mass 2 kg is dropped from a height of 20 m. At what height above the ground is its kinetic energy three times its potential energy? (Take g = 10 m/s² and ignore air resistance.)