council for mineral technology - mintek

Council for Mineral Technology

Specialists in mineral and metallurgical technology

MINQUIZ 2010PROVINCIAL COMPETITION

ORAL QUIZ

16 JULY 2010

PRACTICE QUESTION

1. Water freezes at 0°Celsius. At how many degrees Fahrenheit does water freeze?

A 50B 32C 45D 63

1. If a stone of mass m falls freely through a vertical distance h, its kinetic energy gained will be ...

A m hB ½ m hC ½ m h2

D m g h

2. When monochromatic light is totally reflected by a mirror, which of the properties of the light stays the same after reflection?

A Speed onlyB Frequency onlyC Speed, frequency and photon energyD Speed and frequency

3. An oxidising agent …

A accepts electronsB donates electronsC accepts protonsD donates protons

4. X and Y are isolated spherical conductors carrying unknown charges. The two attract each other. Which of the following situations is not possible?

A X is neutral and Y is chargedB X is charged and Y is neutralC X is negative and Y is positiveD X and Y are both positive

5. A set of Christmas tree lights consists of 20 identical globes connected in series. The set is connected to a 240 V source. Calculate the potential difference across each globe.

A 12 VB 4 800 VC 240 VD 20 V

6. In a vacuum all electromagnetic waves have the same …

A frequencyB speedC wavelengthD energy

7. Which of the following compounds does not contain either a double or a triple bond?

A N2B C2H2C H2OD CH3CHCH2

8. In which of the following molecules is the covalent bond most polar?

A H2SB H IC HCℓD Cℓ2

9. A solution of which the concentration is accurately known is …

A a standard solutionB a normal solutionC a neutral solutionD a saturated solution

10. Of the equations below, which one is a chemical reaction?

A H2O(ℓ) → H2O(g)B CO2(g) + H2O(ℓ) → H2CO3(aq)C I2(s) → I2(g)D CO2(g) + O2(g) → O2(g) + CO2(g)

11. A(3;6), B(1;2) and C(7;4) are vertices of triangle ABC. Determine the equation of the altitude from A to BC in the form y = mx + c.

A y = -2x + 4B y = 2x + 4C y = -3x + 15D y = - 2x - 5

12. Determine the minimum value of the function y = 3 sin 2x – 4.

A -7B -2C -1D 3

13. If f (x) = sin bx and f (x) passes through (45°; 1) determine b.

A 1B 2C 3D -3

14. Simplify: 4(3x – (5 – 3y + 5x) + 7y)

A 34x + 16y - 91B -8x + 40y - 20C 40x + 76y - 77D None of the above

15. = 27, find the value of x.x 81

16. Find the root of p7 + 128 = 0.

A 3B 2C -3D -2

17. Determine the equation of the asymptote of the graph y = 5(x + 2) – 3.

A y = -3B y = 3C x = -3D x = 2

18. What number comes next in the series?

9; 5; 8; 14; 10; 13

A 7B 9C 16D 19

19. If (a – 7)(b + 11) = 0, solve for b if a = 7.

A -11B Any numberC 11D 0

20. Determine the value of x in terms of p and qif p(x – p) = q(x – q).

A (q – p)B (p + q)C (p – q)D p2 – q2

21. What do you call the remains of the sun after its nuclear reactions stop?

A Neutron starB PulsarC Black holeD White dwarf star

22. When exposed to solar ultraviolet radiation, which vitamin is produced in our bodies?

A Vitamin KB Vitamin AC Vitamin CD Vitamin D

23. Which metals are used in the aircraft industry because of their low density and high resistance to corrosion?

A Aluminium and titaniumB Cadmium and stainless steelC Zinc and tantalumD Thallium and chromium

24. The Earth’s crust and the air above are made up of four separate parts which are closely related and overlap each other. Which part is inhabited by living things?

A LithosphereB BiosphereC HydrosphereD Atmosphere

25. The catalyst used in the Macarthur-Forrest Cyanide Process used for extracting gold from low quality ore is…

A zincB platinumC copperD lime

26. Solder is an alloy of two metals used for joining wires together. The two metals used in solder are…

A iron and carbonB nickel and chromiumC nickel and copperD tin and lead

27. Vehicle bodies are dipped into a bath of molten metal to form a protective layer against rust. Which metal is used for this protective layer?

A CopperB ChromiumC ZincD Tin

28. What is the Earth’s surface area mostly composed of?

A LandB Mountain rangesC WaterD Plains

29. Which one of the following salts gives a basic solution when dissolved in water?

A NaCℓB K2SO4C CH3COONaD NH4Cℓ

30. The name of the layer of the Earth that separates the crust from the core is the…

A magmaB lithosphereC asthenosphereD mantle

END OF STANDARD GOLD

QUESTIONS

GOLDTIE-BREAK

GOLD TIE BREAK

1. A passenger remains seated in a moving taxi. The taxi stops suddenly and the passenger is thrown forward. This best illustrates…

A Newton’s first law of motionB Newton’s second law of motionC Newton’s third law of motionD Newton’s universal gravitational law

GOLD TIE BREAK

2. A DC source should be used to …

A obtain a changing magnetic fieldB operate a transformerC produce heatD charge a battery

GOLD TIE-BREAK

3. Determine the minimum value of A if A = (x2 – 4x + 4) - 1

A 2B -2C 1D -1

GOLD TIE-BREAK

4. Solve for x in the equation 4x2 + x - 3 = x.

B 3 or 1

C 3 or -1

GOLD TIE-BREAK

5. 94% of the Earth’s crust is composed of which of the following elements?

A Oxygen, iron, lead and calciumB Oxygen, gold, copper and siliconC Oxygen, iron, silicon and magnesiumD Oxygen, silicon, carbon and magnesium

END OF GOLDTIE-BREAK

GOLDTIE-BREAK

SUDDEN DEATH

GOLD TIE BREAK SUDDEN DEATH

1. Which statement is correct? Light waves of different frequencies …

A have the same speed in all circumstancesB have different speeds in the same material

mediumC have the same speed in the same material

mediumD have different speeds in a vacuum

2. Bromine water is readily decolourised by …

A etheneB methaneC methanolD hydrogen

3. Which of the following molecules is not polar?

A H2OB HCℓC HFD Cℓ2

GOLD TIE-BREAK SUDDEN DEATH

4. If y = ax and passes through (2; 5), with a > 0, determine a.

A 5BC 2D 10

5. Determine + in simplest surd form.

A 4B 3C 2D 5

2 32 2 2

6. If 2; 3; 4; 6; 6; 9; 8; 12; x; y are given as a sequence, determine x and y.

A x = 14; y = 10B x = 10; y = 15C x = 13; y = 16D x = 15; y = 13

7. The main South African coalfields are in…

A Gauteng and the Free StateB Mpumalanga and Northern KwaZulu-NatalC Northern Cape and North WestD Limpopo and Mpumalanga

8. As what rock is Marble classified?

A Intrusive igneous rockB Extrusive igneous rockC Sedimentary rockD Metamorphic rock

9. What instrument did Galileo improve apon?

A TelescopeB Magnifying glassC MicroscopeD Glasses

10. All of the following places have, or once had, ruby mines, except:

A South AfricaB Sri LankaC ThailandD Vietnam

END OF GOLDTIE-BREAK

SUDDEN DEATH

PLATINUM

1. In the circuit below, the internal resistance of the battery is negligible. What will be the effect on the voltmeter reading and the ammeter reading, if switch S is closed?

Voltmeter Ammeter

A. Increases Increases

B. Increases Stays the same

C. Stays the same Increases

D. Stays the same Stays the same

PLATINUM

2. Diffraction through a narrow slit is less for blue light than for red light, because …

A blue light has a shorter wavelength than red light

B blue light travels faster than red lightC the refraction index of air is larger for red light

than for blue lightD blue light has a lower frequency than red light

PLATINUM

3. The capacitance of a parallel plate capacitor is 20 µF. If the area of the plates and the distance between them are doubled, the capacitance will …

A stay the sameB doubledC quadrupleD halved

PLATINUM

4. When an electron and a proton are accelerated from rest through the same potential difference, they acquire the same…

A velocityB momentumC accelerationD kinetic energy

PLATINUM

5. In Supermarkets lasers are used by barcode scanners to identify products. The typical laser used is …

A carbon dioxideB rubyC helium-neonD microwaves

PLATINUM

6. How many carbon atoms are in 4-methyloctane?

A 5B 7C 9D 11

PLATINUM

7. When a few drops of bromothymol blue and a small amount of ammonium chloride crystals are added to water in a test-tube, the water turns yellow. When ammonia gas is bubbled through, the solution will …

A turn blueB stay yellowC become colourlessD turn a darker yellow

PLATINUM

8. When a few drops of concentrated hydrochloric acid (HCl) are added to a saturated sodium chloride (NaCl) solution, …

A sodium chloride is precipitatedB hydrogen gas is producedC sodium hydroxide is producedD the pH of the solution increases

PLATINUM

9. Which one of the following is a salt of sulphuric acid?

A Table saltB Baking powderC Epsom saltD Washing soda

PLATINUM

10. When the hydrogen carbonate ion reacts as a base with the ammonium ion, its conjugate acid is …

A ammoniaB the carbonate ionC the ammonium ionD hydrogen carbonate

PLATINUM

11. Simplify the following:

(bx.c)by (bx ÷÷÷÷ by))))

ABC b2x.cD bxy – x + y . cy

yx cb .2

c.b2xyy2x

PLATINUM

12. What number comes next in the following sequence?

2; -6; 18; -54

A -216B -162C 162D -612

PLATINUM

13. Calculate the value of:

A -2B 2C 1D -1

240cos.30sin).θ90cos(225tan.45sin).θ180sin( 2

PLATINUM

14. If P = x2 – 6x + 12 calculate the maximum

value of R =

126x-x1

2 ++++

PLATINUM

15. A stone thrown vertically into the air reaches a height of h metres after t seconds, and h = 120t – 16t 2. Find the time taken by the stone to reach its maximum height.

C 60 s

D 0,27 s

PLATINUM

16. Simplify:

A 64B 32C 16D 4 + 22n

4168++++

−−−−++++

PLATINUM

17. If A(2; 4) and B(5; 1) are given, determine the length of AB.

A units

B 0 units

C 12 units

D units

PLATINUM

18. Solve for x if 8.3x = 27.2x

PLATINUM

19. If M is the midpoint of A and

B , determine x and y.

A x = 0; y = 1B x = 2; y = 2C x = 1; y = 5D x = -1; y = 3

−−−−23

;1 (((( ))))y ;3−−−−

(((( ))))2; −−−− x

PLATINUM

20. Simplify:

60cos).θ90sin(.90sin315tan.60sin).θ180cos(

++++++++

PLATINUM

21. Natural corundum is found in…

A volcanic rocksB placer gem depositsC metamorphic rocksD all of the above

PLATINUM

22. Basalt is a rock found in the Earth’s crust. It’s mainly found in…

A intrusive igneous rocksB extrusive igneous rocksC sedimentary rocksD metamorphic rocks

PLATINUM

23. Which of the following combinations are renewable energy resources?

A Solar energy and fossil fuelsB Natural gas and nuclear fuelsC Biomass energy and wind energyD Ocean energy and coal

PLATINUM

24. The Witwatersrand basin contains a considerable portion of the world’s gold reserves. Which of the following minerals are also found in the Witwatersrand basin?

A UraniumB NickelC VermiculiteD Iron

PLATINUM

25. Which element is mainly added to iron to produce steel with great resistance to pulling stresses such as that used in long span bridges and bicycle chains?

A TungstenB CarbonC NickelD Manganese

PLATINUM

26. Impacts by large meteoritic projectiles played a major role in shaping the surface of the Earth. The oldest and largest visible impact structure known on Earth was declared a world heritage site in 2005, it is the…

A Pilanesberg complexB TswaingC Plover’s LakeD Vredefort Dome

PLATINUM

27. Why is phosphorus essential to life? Phosphates are important components of …

A DNA and RNAB proteinsC disinfectant substancesD the hormone thyroxine

PLATINUM

28. When 4 mol hexane burns in excess oxygen, how many moles of carbon dioxide are produced?

A 4B 12C 20D 24

PLATINUM

29. Alluvial (placer) gem deposits are those in which the gems are mined from:

A hard rocksB gravel and / or sandC cavesD pegmatites

PLATINUM

30. What celestial objects can be seen with the unaided eye during the daytime?

A The sunB The moon and sunC The sun and VenusD The sun, moon and Venus

END OF STANDARD PLATINUM

QUESTIONS

PLATINUM TIE-BREAK

1. The force between two charged spheres is F Newton. This force can be doubled by …

A doubling the charge on one of the spheresB doubling the charge on both the spheresC halving the distance between the spheresD doubling the distance between the spheres

PLATINUM TIE-BREAK

2. Metals are good conductors of electricity, because they possess …

A vibrating atomsB high melting-pointsC free electronsD free ions

PLATINUM TIE-BREAK

3. Determine the abscissa value where the minimum of ( x2 – 4x + 4) – 1 occurs.

A 2B -1C 1D -1

PLATINUM TIE-BREAK

4. Solve for x in the equation x -2 = 16.

PLATINUM TIE-BREAK

5. The automobile industry makes use of powerful lasers for computer controlled cutting and welding on auto assembly lines. The typical laser used is…

A carbon dioxideB rubyC helium-neonD microwaves

END OF PLATINUMTIE-BREAK

PLATINUM TIE-BREAK

SUDDEN DEATH

PLATINUM TIE-BREAK SUDDEN DEATH

1. The volume of a fixed mass of gas is reduced without a change in the temperature. The gas pressure increases because ...

A the gas particles are now moving fasterB the gas particles have increased in numberC there is a greater distance separating the gas

particlesD a greater number of collisions per unit time now

occurs against the container walls

2. Which one of the following substances has the highest pH?

A household vinegarB lemon juiceC pure waterD ammonia solution

3. Which of the following substances can form an electrolyte?

A PbCℓ2B CaSO4C KBrD Cu(OH)2

4. Given four geometric shapes with the same perimeter, which has the greatest area?

A SquareB CircleC OctogonD Ellipse

5. Determine in simplest surd form.

A 6B 4C 4D 8

2272 ++++

6. If 3; 9; 17; 27; x; y are given as a sequence, determine x and y.

A x = 32; y = 43B x = 29; y = 34C x = 39; y = 53D x = 42; y = 54

7. Ammonium salts are important to plants because they are a source of …

A nitrogenB potassiumC chlorineD phosphorus

8. During the 18 th century a large pipe containing rich metal ores were found at what is known today as Phalaborwa. The pipe was formed as a result of…

A volcanic eruptionsB fossilised remains of plants and animalsC earthquakesD a prehistoric lake

9. Which element is mainly added to iron to increase the strength of iron and form the alloy steel? This alloy is used in motor vehicle bodies, appliances, containers, etc.

A ChromiumB CarbonC CopperD Magnesium

10. What is the formula of iron(III)oxide?

A FeOB Fe3OC Fe3O2D Fe2O3

THE END!

council for mineral technology - mintek

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