Tepa SHS booked a semifinal spot in the ongoing National Science and Maths Quiz. They defeated Accra Academy and St. John’s Grammar, both based in Accra Friday morning to achieve the feat.
The Ashanti Region school took the quarterfinal contest by the horns and dragged their challengers throughout the five-round battle. Tepa was not tipped among the favourites to win the ultimate at the start of the competition but after reaching the semifinal and putting down some fancied schools, they should hope for more.
They finished their quarterfinal contest in style with 50 points; impressive considering some giants achieved the same feat with lesser tallies.
Accra Academy, perhaps the favourites, for this contest was no match at all and finished with just 29 points.
St John’s Grammar who defeated Volta Region giants, Bishop Herman College and seeded school, Ghana National College, to get to the quarterfinal, put up a good fight but only finished in second with 39 points.
The quarterfinal contests continue till Saturday, July, 6.
ROUND 1 QUESTIONS AND SOLUTIONS
1. Compare and contrast the chemical characteristics of metals with non-metals with respect to their oxides.
2.Compare and contrast the chemical characteristics of metals with non-metals with respect to their hydrides.
3. Define the term amphoteric substances and give any two common substances to illustrate your answer.
4. If alpha and beta are the Roots of x²+5x+3=0Evaluate:
i. a²+b²ii. 1/a + 1/
5. A parallel plate capacitor has an area of 4.0m² and plate separation of 3.0mm. Find the energy stored by the capacitor when the magnitude of the electric field between the plate is 20kilovolts/m.
6. Find the energy stored by a parallel plate capacitor with the volume of 1.6×10-² m³ between the plate when the magnitude of the electric field between the plate is 15kilovolts/m
7. Find the energy stored by a parallel plate capacitor with the volume of 7.0×10-² m³ between the plate when the magnitude of the electric field between the plate is 8.0kilovolts/m
8. In the natural system of classification, organisms are arranged on the basis of known taxonomic characters instead of one of the first few named. Name one of such characters
9. There are 5 postulates of the kinetic molecular theory. State any one of them and show how the postulate is manifested in the behaviour of gases.
10. Determine if the pair of lines are perpendicular, parallel or neither. i. x+3y=5 x-3y=5ii. x-2y=2 2x+y=3iii. 2x+3y=5 6y=-4x+20
11. A chair has 4 legs each of cross-sectional area 4.0m². Find the pressure each chair exerts on a horizontal floor when the legs equally support a 640N weight.
12. A 450N cube of side 0.02m is stationary on a plane inclined at 30° to the horizontal. What is the pressure the cube exerts on the plane13?
The 450 N cube of side 0.20m is now pulled across a horizontal floor by a 250N Force inclined at 30° to the horizontal. What now is the pressure exerted by the cube on the floor.14. Most of the hormones produced by anterior pertuitory perform what function.?15. What is the function of the hormone Erythropoietin?
16. Which endocrine glands are associated with the kidneys.
17. State the products obtained at the respective electrodes when dilute NaCl is electrolysed using inert electrodes and give the amounts in moles that will be formed after passing a charge of 0.600 Faraday.
18. State the expected product when molten KBr is electrolysed using graphite as the electrodes. Give the amount in moles of the products that will be formed after passing 0? 500 Faraday of charge.
19. The electrolysis of a concentrated solution of NaCl is an industrial method for manufacturing NaOH. Give the appropriate solution of the electrodes to show how NaOH is formed.
20. Given that Sin A=5/13 and Sin B =3/5 and A and B are acute angles, evaluate. i. Sin 2B ii. Cosine 2A iii. Sin (A+B)21. What is the activity of 2.0 ×10^15 atoms of a radioisotope with a Half-life of 6.93×10^5 seconds?
22. Lead 203 has a half life of 1.17×10^4 seconds. How many atoms of lead 203 have an activity of 56 Mega becryl.23. Rodium 104 has a half life of 42.3 seconds. How many atoms of rodium 203 have an activity of 96 Megabecryl.
24. State whether A. Squamous B Cuboidal C. Columnar or D. Transitionaepithelial cells are best adapted to the following i. Aid diffusion ii. Found in glands iii. Found in the urinary bladder.
1. The oxides of metals are ionic and those of non-metals are covalent. Oxides of metals are basic while non-metals are acidic.
2. Hydrides of metals are ionic while that of non-metals are covalent. Hydrides of metals dissolve in water to give alkaline solution whereas the hydrides of non-metals with exception of ammonia dissolve to give acidic solution.
3. Any substance that can behave as both acid and base. Eg ZnO4. i 19 ii. -5/3 iii. -155. 2.1×10^-5 joules6. 1.6×10^-5 joules7.2.0×10^-5 joules8. morphological characteristics Anatomical Physiological Genetic characters
9. i. Gases are composed of molecules or atoms whose size is negligible compared to the average distance between them. Implication: gases can easily be compressed ii. Molecules or atoms move randomly in straight lines in all directions and at various speeds. Implications: Brownian motion or pressure of a gas in a container is uniform on all surfaces iii.
The forces of attraction or repulsion between two molecules or atoms in a gas are very weak or repulsion between two molecules or atoms in a gas are very weak or negligible. Implications: gases fill any available space because of small intermolecular forces.
Also, gases in a mixture behave independently. iv. When molecules or atoms collide with one another, the collisions are elastic. Implications: an isolated quantity of gas does not lose pressure. v. The average kinetic energy of gaseous molecules or atoms is proportional to temperature. Implications: Brownian motion and pressure or volume increase with temperature.
10. I neither perpendicular nor parallel. ii. perpendicular iii. Parallel.11. 400 kilopascal12. 9.7 kilopascal13. 8.1 kilopascal.14. They regulate the production of other hormones
15. It helps in the reduction of the production of more red blood cells in the body. when the body is in hypoxia, the erythropoietin reduces the production of more red blood cells.
16. Adrenal glands.
17. At the cathode, hydrogen gas will be formed and at the anode oxygen gas will be formed. Number of moles present Oxygen=0.050 mol Hydrogen= 0.0300mol
18. At the cathode potassium Anode… Bromine gas Number of moles present K= 0.500 moles Br = 0.250 mol19.20.I 24/25 ii 119/169 iii. 63/6521. 2.0×10^9 mega bycryl22. 56 mega bycryl23. 5.9×10^924. i. Columnar ii. Columnar iii. Transitional.
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