MINQUIZ 2015 PROVINCIAL COMPETITION WRITTEN TEST MEMO TIME ALLOWED: 45 MINUTES NOTE: DO NOT OPEN UNTIL INSTRUCTED TO DO SO.

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1 MINQUIZ 05 PROVINCIAL COMPETITION WRITTEN TEST MEMO TIME ALLOWED: 45 MINUTES NOTE: DO NOT OPEN UNTIL INSTRUCTED TO DO SO. Mintek 00

2 NOTES The test consists of 40 standard questions (split between Physical Science, Mathematics and General Knowledge in Science, Engineering & Technology) and 5 OPTIONAL bonus questions. The bonus questions will only count if there is a tie. In the event of a TIE, the highest number of correct tie-breaker questions will be used to break the tie. If there is still a tie after the tie-breaker questions, negative marking will be applied, and if a tie still exists, then the winner will be determined by means of a coin toss. Only the ANSWER SHEET will be marked and no workings or calculations are required to be shown. For each question, only ONE box on the multiple-choice answer sheet should be marked. The boxes should be COMPLETELY SHADED to aid marking. If more than one box is selected or if no selection is made, no mark will be awarded for that question. Negative marking will NOT apply (except if there is a tie). You are advised to use an HB PENCIL so that you can make alterations. No calculators allowed. You may make use of the periodic table provided. Please write your name and surname (and other contact details) on the answer sheet in the spaces provided. Fill in your student number (provided at registration) on the answer sheet. Please REMAIN SEATED until the end of the test. Note the following constants: Avogadro s Number N A = 6,0 x 0 Absolute zero 0K = -7ºC Speed of light =,0 x 0 8 m s - mol of electrons has a charge of 9,65 x 0 4 C Mintek 00

3 . Three forces, F, F and F, acting on the same point, as indicated in the vector diagram, are in equilibrium. F forms an angle θ to the horizontal. The magnitude of the horizontal component of F equals: 0 F F θ F C. F D. F + F F. The next term in the sequence ; ; ; 9 ; 9 ;. is: 0 C. 7 D.. CHPC is a South African company. CHPC stands for: carbon hydro phosphate company cosmic high performance company C. centre for high performance computing D. cosmic high pressure computing 4. Forces with magnitudes 0N, 40N, and 50N act at a point. Which one of the following cannot be the magnitude of the resultant? 0N 8N C. 58N D. 0N 5. The 0th term of the sequence 7 ; 9 ; 9 ; ; ; ; ;. is: 4 5 C. 9 D. 6. John, who is standing in a lift, observes a 0N mass piece suspended from a spring balance fixed to the roof of the lift. He sees that the reading on the spring balance is less than 0N for a short interval. The correct description for the motion of the lift during the short interval is that the lift is: not moving accelerating upwards C. accelerating downwards D. moving with constant velocity Mintek 00

4 7. What is MINTEK s focus? To do research and develop and implement new and improved technologies in the minerals and metallurgical sectors To monitor mining in South Africa C. To make South African coins D. To do research, develop and implement new and improved technologies in the civil sectors 8. Two dice are rolled and the numbers are added. What is the probability of getting a sum of 7? C. 6 D The set of numbers ; ; 4 ; 6 ; 7 ; 7 ; x has the same median and mean of 6. The value of x is: 8 0 C. 5 D The gravitational force which the earth exerts on the moon is: directly proportional to the distance between their centers inversely proportional to the mass of the moon C. inversely proportional to the product of the mass of the moon and the mass of the earth D. inversely proportional to the square of the distance between their centers.. The element with 8 protons and 6 electrons is: oxygen oxide C. sulphur D. sulphide. What will most likely be mined from the rocks of the Bushveld Complex in the future? coal gold C. platinum Mintek 00 4

5 D. iron. The graph of y = 4( x )( x+ ) cuts the x-axis at points A and The length of line segment AB in units is: 5 C. 6 D Waves of a certain frequency enter a different medium where the wave velocity is greater. Which of the following statements regarding the frequency and the wavelength in the new medium is correct? the frequency remains the same and the wavelength increases the frequency and the wavelength both increase C. the frequency increases and the wavelength remains the same D. the frequency remains the same and the wavelength decreases 5. nx ( ) represents the number of prime numbers less than x. The value of nn ( (0)) is: 4 5 C. 0 D. 6. Consider g of each of the four different gasses given below. The gasses are at the same temperature and pressure. The gas that will occupy the largest volume is: O N C. Cl D. NH 7. The temperature (in Kelvin) of a fixed mass of gas in a closed container is T. If the conditions are changed such that both the new pressure and the new volume of the gas are double what they were, then the new temperature will be: C. D If a cube has a volume, in cm, which is the same as its total surface area, in the area of one side of the cube is: cm cm, then Mintek 00 5

6 9 cm C. 6 cm D. 6 cm 9. Nanospacecrafts can NOT be used for: To investigate interstellar space To monitor the development of solar winds and flares C. To capture viewpoint pictures of asteroids D. For visits to mars 0. Look at the following equation: Fe + O Fe O 4 One mole Fe yield mole(s) Fe O 4 C. D. 4 x. If 0,75 y =, then the value of x+ y x is: C. D The number of oxygen atoms in 50g marble is: 50 x 6,0 x 0 0,5 x 6,0 x 0 C.,5 x 6,0 x 0 D. 6 x 6,0 x 0. What is dark matter? emits no radiation Luminous matter Mintek 00 6

7 C. black matter D. clear matter 4. If f () = 0 and f( n) = f( n ) + n where n > 0, then () 5 7 C. 8 D. 9 f is equal to: 5. Once a star exhausts its core supply, the star becomes more luminous. Helium Hydrogen C. Oxygen D. Nitrogen 6. If x y = x+ y, then the value of x+ y x+ 0y is: C. 9 8 D. 7. Three identical conducting spheres P, Q and R on insulated stands are charged 0 nc, 6 nc and -4 nc respectively. The three sphere s touch. What is the charge on P? 4 nc nc C. - nc D. nc 8. ARGO is the.. systematic robotic monitoring system of the global rain falls systematic robotic monitoring system of the global desserts C. systematic robotic monitoring system of the global winds D. systematic robotic monitoring system of the global oceans Mintek 00 7

8 9. If ( x + 8x+ 6) + ( y y+ ) = 0 then the value of x+ y is: C. D. 0. If a= + n and b= + n, then the value of b in terms of is: C. a+ a a+ a+ a a D. a. What are exoplanets? planets that disintegrated planets that do not orbit a star C. planets that orbit a star D. gas giants. Two identical point charges exert a force F on each other when at a distance d apart. What will the force be if the distance between them is d? C. F D. 9F x y. If.. z = 79, then the mean of x, y and z is: C. D. not possible to determine Mintek 00 8

9 4. Which arrangement of a number of ohm resistors will result in a total resistance of 7 ohm? C. D. 5. A reaction at equilibrium in a closed container, is represented by the following equation: N (g) + H (g) NH (g) H<0 Which one of the following actions will affect both the value of K c and the concentration of ammonia present at equilibrium? adding a suitable catalyst reducing the temperature C. increasing the mass of nitrogen D. increasing the pressure at a constant temperature. 6. The maximum value of the expression C. D. not possible to determine (cosx sin x) + is: 7. Two numbers are in the ratio :. When 4 is added to each number, the ratio changes to 5 : 7. The sum of the two original numbers is: 0 5 C. 5 D In which one of the following reactions will addition of more reactant(s) to the reaction vessel have no effect on the rate of the reaction: H O + (aq) + OH - (aq) H O (l) H (g) + I (g) HI (g) C. CaCO (s) CaO(s) + CO (g) Mintek 00 9

10 D. H (g) + CO (g) CO(g) + H O(g) 9. Crystallography is not applied in which of the following fields? Chemistry Mathematics C. Geology D. Art 40. If >, arrange the following from smallest to biggest: ;+ ;+ ;+ ;+ + ; ;+ C. + ; ;+ D. + ;+ ; END OF STANDARD QUESTIONS BONUS QUESTIONS: TIE-BREAKER NOTE: The Tie-Breaker questions will only be considered, should there be equal scores in the preceding 40 questions.. In the reaction: NH + H O NH OH - OH - acts as a weak acid NH 4 + acts as a weak base C. NH acts as a weak base D. NH acts as a strong acid 0. If a = and a= b a> b C. a< b D. a= b 0 b =, which of the following is true: Mintek 00 0

11 . Which one of the following compounds belongs to the same homologous series as C H 8? C H C H 6 C. C H 4 D. C 4 H 0 4. In a set of numbers, there are 5 even numbers and 4 odd numbers. Two numbers are chosen at random (without replacement). What is the probability that the sum of the two numbers is even? 0 7 C. D The resultant force acting on a helicopter that is moving upwards is zero. The helicopter must have: zero potential energy zero kinetic energy C. constant potential energy D. constant kinetic energy.end.. Mintek 00

12 Periodic Table of the elements Mintek 00

13 Notes Mintek 00