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CBSE Proficiency Test in Science Sample Paper

Proficiency Test Sample Papers

Section I: Multiple Choice questions This section contains 9 questions. For questions 1 to 9 only one of the four options is correct. You have to indicate your answer by filling the appropriate bubble in the Answersheet. A correct answer will earn 2 marks, a wrong answer will earn (—|) mark, and an unattempted question will earn 0 mark. 1. There are several microorganisms like amoebae and bacteria that live in water and use oxygen. Choose the option that describes the process by which oxygen enters the cell through the plasma membrane. (A) The plasma membrane selectively takes in oxygen into the cell. This process needs energy. (B) The plasma membrane selectively takes in oxygen into the cell. This process does not need energy. (C) Oxygen enters into the cell from the surrounding water by diffusion. This process does not need any energy. (D) Oxygen enters into the cell from the surrounding water by diffusion. This process needs energy. 2. Select the option that gives the size of the components in a cell in an increasing order. (A) ribosome, mitochondria, nucleus, ATP (B) ATP, ribosome, mitochondria, nucleus (C) mitochondria, ribosome, ATP, nucleus (D) ATP, mitochondria, ribosome, nucleus 3. Select the correct statement about viruses. (A) Viruses consume host cells by ingestion. (B) Viruses depend on the host cells for respiration. (C) Viruses reproduce outside the host cells and spread infection to other host cells. (D) Viruses do not have any metabolic process occurring within themselves. 4. There are two samples of 2 g each of hydrogen and helium gases. Which of the following statements is true? (A) Number of moles of hydrogen is the same as that of helium. (B) Number of moles of hydrogen is double that of helium. (C) Number of moles of hydrogen is half that of helium. (D) Number of moles of hydrogen is four times that of helium. 5. A student needed to find out the polarity (+ or —) of the two terminals of a battery coming out of a device. She made a setup by placing the two wires inside water (with little lemon added) in a glass and checked if gases were bubbling out from the wire ends. Which of the following is correct? (A) The wire end with higher quantity of gas bubbles is the negative terminal. (B) The wire end with higher quantity of gas bubbles is the positive terminal. (C) The wire end with no gas coming out is the negative terminal. (D) The wire end with no gas coming out is the positive terminal. 56. One day, a chemist put two different reacting gases P and Q in a balloon, sealed it properly and went home. Next morning, she found that the balloon has shrunk in volume. Assuming that a reaction of the type pP + qQ = rR + sS has taken place, where the products R and S are also gases, which of the following statements is true? (A) The relation (r + s) > (p + q) is satisfied. (B) The relation (r + s) < (p + q) is satisfied. (C) The relation (r + s) = (p + q) is satisfied because of conservation of mass. (D) There is no restriction on the values of p, q, r, s. 7. The displacement (in m) versus time (in s) graph for a car on a straight road is shown below:Which of the following statements is true? (A) The car is stationary throughout between t = 4 s and t = 8 s. (B) The car has positive uniform acceleration between t = 6 s and t = 10 s. (C) The car moves with uniform speed of 2.5 m s-1 between t = 2 s and t = 6 s. (D) The speed of the car at t = 1 s is double its speed at t = 8 s. 8. Figure below shows a ray of light in a glass slab incident on the interface between the slab and another medium X. The angle of incidence is 30° and the angle of refraction is 0 where sin 0 = |. 0 Medium X 730° Glass If the absolute refractive index of glass is 1.5 and the speed of light in vacuum is 3 x 108 m s 1, what is the speed of light in medium X? (A) 2.5 x 108ms-1. (B) 3.0 x 108ms-1. (C) 1.88 x 108ms-1. (D) 1.25 x 108ms-1. 69. A deep well has water at a depth of 80 m below the top of the well. A stone is dropped from the top. If the speed of sound in air is 320 m s-1 and the acceleration due to gravity, g = 10 m s-2, then the splash of the stone hitting the water is heard (A) 3.75 s later. (B) 4.25 s later. (C) 8.25 s later. (D) 4.50 s later. Section II: Numerical questions This section contains 3 questions. For questions 10 to 12 the answer is an integer between 0 and 99. You have to indicate the answer by filling bubbles in the appropriate grid provided in the Answersheet. Each question carries 4 marks. Haemophilia or bleeder’s disease is a condition which prevents formation of factor VIII, an important blood clotting factor. The gene for factor VIII is carried on the X chromosome. This gene can appear in two forms – normal (dominant) and mutant (recessive). Thus, a female with genotype XHXh carries one copy of normal gene (H) and one mutant (h). She is called a carrier. Such a woman marries a normal male (XHY). What is the probability that their first child will be a normal son? Express the answer in percentage. The pH of an acid solution is related to the concentration c of the H + ion by the relation c = 10-x, where x is the pH value. 10 ml of an HCl solution of pH value x = 2 is diluted with water to get a final volume of 100ml. Calculate the pH value of the final solution. The weight of an empty glass is 1 N. When completely filled with water, the glass weighs 4 N. If you now throw the water away and fill the glass partly with sand, the weight becomes 4 N. If the rest of the glass is now filled up with water, the weight becomes 6 N. What is the relative density of sand? Section III: Column-matching questions This section contains 3 questions. For questions 13 to 15 you have to match the options in Column II for each item in Column I. You have to indicate the matches by filling bubbles in the appropriate grid provided in the Answersheet. If all correct options are matched, and no incorrect option is matched, each item in Column I earns 2 marks. 13. For each item in Column I, match ALL the correct options in Column II. Column I (i) Thyroxin (A) Plant growth (ii) Auxin (B) Iodine (iii) Adrenalin (C) Goitre (D) Fight or flight (E) Hormone (F) Enzyme Column II 714. Some chemical reactions are listed in Column I below. Column II lists some properties of chemical reac- tions. For each item in Column I, match ALL the correct options in Column II. Column I (i) C (s) + O2 (g) = CO2 (g) (ii) 2HgO(s) = 2Hg(s) +O2(g) (iii) NaOH (s) + HCl (l) = NaCl (s) + H2O (l) Column II (A) Neutralisation reaction (B) Exothermic reaction (C) Decomposition reaction (D) Endothermic reaction (E) Combination reaction (F) Double displacement reaction 15. A ball of mass m is thrown vertically upwards with a certain initial speed, u, so that it reaches a maximum height of h. Assume that the acceleration due to gravity is g and that there is no air resistance. Then, for each item in Column I, match ALL the correct options in Column II. Column I (i) The ball is travelling upwards. (ii) The ball is at the highest point. (iii) The ball is travelling downwards. Column II (A) Total energy (kinetic + potential) is constant = mgh. (B) Total energy (kinetic + potential) is constant = mgh + 2 mu2. (C) Acceleration is directed downwards and constant. (D) Velocity and acceleration are in the same di- rection. (E) The force on the ball is zero. (F) Both velocity and acceleration are zeroSolution:1. C2. B3. D4. B5. A6. B7. D8. A9. B10. 2511. 312. 313. i. B C Eii. AEiii. DE14. i. B Eii. CDiii. A B F15. i. A C