HS Sample Set 10, Round 6 from NSB
Which of the following elements most often limits primary production in freshwater lakes? W) Oxygen X) Calcium Y) Carbon Z) Phosphorus
W: W) Oxygen
X: X) Calcium
Y: Y) Carbon
Z: Z) Phosphorus
Answer: Z) Z) Phosphorus
Identify all of the following three statements that are true of wooly mammoths: 1) They once lived in North America; 2) They had ivory tusks; 3) They evolved in the Devonian Period.
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One species resembles another species that is poisonous. What is this phenomenon called? W) Commensalism X) Mutualism Y) Batesian mimicry Z) Mullerian mimicry
W: W) Commensalism
X: X) Mutualism
Y: Y) Batesian mimicry
Z: Z) Mullerian mimicry
Answer: Y) Y) Batesian mimicry
What human organ utilizes the most glucose in the body? W) Liver X) Heart Y) Lungs Z) Brain
W: W) Liver
X: X) Heart
Y: Y) Lungs
Z: Z) Brain
Answer: Z) Z) Brain
To three significant figures, at what temperature, in kelvins, does pure water boil at sea level?
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In a several step production process, the efficiency of Stage 1 is 45 percent, the efficiency of Stage 2 is 85 percent, and the efficiency of Stage 3 is 15 percent. To the nearest whole number percent, what is the overall efficiency of the process?
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What is the degree measure of each interior angle in a regular hexagon?
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Which of the following is true regarding the graph of \(y = -x^3\) at \(x = -2\)? W) increasing and concave up X) increasing and concave down Y) decreasing and concave up Z) decreasing and concave down
W: W) increasing and concave up
X: X) increasing and concave down
Y: Y) decreasing and concave up
Z: Z) decreasing and concave down
Answer: Y) Y) decreasing and concave up
What is the maximum number of electrons that the 3d level can hold? W) 2 X) 6 Y) 10 Z) 14
W: W) 2
X: X) 6
Y: Y) 10
Z: Z) 14
Answer: Y) Y) 10
Under aqueous conditions, which of the following reactions would generate a precipitate? W) Ammonium chloride mixed with potassium hydroxide X) Calcium chloride mixed with potassium nitrate Y) Calcium carbonate mixed with hydrochloric acid Z) Barium chloride mixed with potassium sulfate
W: W) Ammonium chloride mixed with potassium hydroxide
X: X) Calcium chloride mixed with potassium nitrate
Y: Y) Calcium carbonate mixed with hydrochloric acid
Z: Z) Barium chloride mixed with potassium sulfate
Answer: Z) Z) Barium chloride mixed with potassium sulfate
What refinery process is used to separate components of petroleum based on their boiling points?
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Landfill gas, a potential source of energy, is mostly composed of what specific hydrocarbon?
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The +3 oxide of what element is added to molten silicate to generate a glass with a low thermal expansion coefficient that is used for lab glassware?
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Rank the following three gaseous phase monatomic elements in ascending order of electron affinity: 1) Boron; 2) Silicon; 3) Chlorine.
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Measured in newtons, what is the magnitude of the centripetal force on a 10-kilogram object traveling along a circular path with a radius of 50 meters at a velocity of 20 meters per second?
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A large block of ice is placed in a water bath maintained at 80 °C. After some time, one half of the mass of the ice block has melted. What is the temperature, in degrees Celsius, of the surface of the remaining ice?
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Plant cells are distinguished from animal cells by having: W) A large central vacuole, chloroplasts, and a cell wall made of cellulose X) A large central vacuole, mitochondria, and a nucleus Y) A cell wall made of cellulose, Golgi apparatus, and chloroplasts Z) Chloroplasts, mitochondria, and a nucleus
W: W) A large central vacuole, chloroplasts, and a cell wall made of cellulose
X: X) A large central vacuole, mitochondria, and a nucleus
Y: Y) A cell wall made of cellulose, Golgi apparatus, and chloroplasts
Z: Z) Chloroplasts, mitochondria, and a nucleus
Answer: W) W) A large central vacuole, chloroplasts, and a cell wall made of cellulose
Which of the following plant hormones plays the largest role in the germination of a seed? W) Cytokinin X) Zeatin Y) Gibberellins Z) Ethylene
W: W) Cytokinin
X: X) Zeatin
Y: Y) Gibberellins
Z: Z) Ethylene
Answer: Y) Y) Gibberellins
Which of the following equations is that of a line perpendicular to the line with equation \(4x - 5y = 10\)? W) 4x – 5y = 12 X) 4x + 5y = 12 Y) 5x – 4y = 10 Z) 5x + 4y = 10
W: W) 4x – 5y = 12
X: X) 4x + 5y = 12
Y: Y) 5x – 4y = 10
Z: Z) 5x + 4y = 10
Answer: Z) Z) 5x + 4y = 10
Identify all of the following four properties that are preserved under a translation: 1) Distance; 2) Collinearity; 3) Midpoint; 4) Angle measure.
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When subjected to intense heat and pressure, limestone becomes which non-foliated metamorphic rock?
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Addition of which of the following compounds may promote carbon sequestration in the ocean? W) Potassium hydroxide X) Carbonic acid Y) Hydrochloric acid Z) Sulfur
W: W) Potassium hydroxide
X: X) Carbonic acid
Y: Y) Hydrochloric acid
Z: Z) Sulfur
Answer: W) W) Potassium hydroxide
Which of the following percentages is closest to the percent of U.S. electricity generated from fossil fuels in 2014? W) 30 X) 50 Y) 70 Z) 90
W: W) 30
X: X) 50
Y: Y) 70
Z: Z) 90
Answer: Y) Y) 70
Which of the following is NOT a type of nuclear reactor currently used in the United States? W) Boiling water X) Solid sodium Y) Pressurized water Z) Liquid metal breeder
W: W) Boiling water
X: X) Solid sodium
Y: Y) Pressurized water
Z: Z) Liquid metal breeder
Answer: X) X) Solid sodium
Liverworts are a part of which nonvascular plant phylum?
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Tetanus is a disease caused by what genus of endospore-forming bacteria?
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What is the degree of the polynomial \(x^2 + 3x^8 + 7x\)?
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Maggie bakes 48 cookies and sells half of them that morning for \$2.50 each. In the afternoon, she sells two-thirds of what she has left at half price. In the late afternoon, she sells the remaining cookies at \$1 each. If each cookie costs \$0.75 for her to make, what was her profit, in dollars, for the day?
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The Montreal Protocols were a series of international agreements to phase out what harmful pollutants that destroy stratospheric ozone?
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Which of the following is NOT true of tropical forest soils in relation to temperate forest soils? W) Tropical forest soils are richer in nutrients X) Tropical forest soils experience more intense leaching Y) Temperate forest soils retain more organic matter Z) Temperate forest soils are thicker
W: W) Tropical forest soils are richer in nutrients
X: X) Tropical forest soils experience more intense leaching
Y: Y) Temperate forest soils retain more organic matter
Z: Z) Temperate forest soils are thicker
Answer: W) W) Tropical forest soils are richer in nutrients
Under which of the following conditions does the behavior of real gases deviate most from that predicted by the Ideal Gas Law? W) Low pressure, low temperature X) High pressure, low temperature Y) Low pressure, high temperature Z) High pressure, high temperature
W: W) Low pressure, low temperature
X: X) High pressure, low temperature
Y: Y) Low pressure, high temperature
Z: Z) High pressure, high temperature
Answer: X) X) High pressure, low temperature
Which of the following best explains why NaCl has a higher melting point than HCl? W) HCl can form hydrogen bonds, while NaCl cannot X) HCl has stronger London dispersion forces Y) HCl is a molecular compound, while NaCl is an ionic compound Z) HCl is a network compound, while NaCl is a molecular compound
W: W) HCl can form hydrogen bonds, while NaCl cannot
X: X) HCl has stronger London dispersion forces
Y: Y) HCl is a molecular compound, while NaCl is an ionic compound
Z: Z) HCl is a network compound, while NaCl is a molecular compound
Answer: Y) Y) HCl is a molecular compound, while NaCl is an ionic compound
A block rests upon an incline of an unknown angle. If the coefficient of static friction between the block and the incline is \(\tfrac{1}{3}\sqrt{3}\), and the block is just barely held by friction, what is the angle of the incline to the horizontal, to the nearest degree?
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An elevator is moving downward with decreasing speed. What are the directions of its velocity and acceleration? W) Both are upward X) Both are downward Y) Velocity is upward and acceleration is downward Z) Velocity is downward and acceleration is upward
W: W) Both are upward
X: X) Both are downward
Y: Y) Velocity is upward and acceleration is downward
Z: Z) Velocity is downward and acceleration is upward
Answer: Z) Z) Velocity is downward and acceleration is upward
Demand Side Management, as part of smart grids, is a combination of programs that allows which of the following? W) Customers to change their energy consumption patterns based on a varying rate of the cost of electricity X) Generators to change their production patterns based on a varying rate of the cost of electricity Y) Utilities to refund money to customers Z) Meter readers to be replaced by automated smart electricity meters
W: W) Customers to change their energy consumption patterns based on a varying rate of the cost of electricity
X: X) Generators to change their production patterns based on a varying rate of the cost of electricity
Y: Y) Utilities to refund money to customers
Z: Z) Meter readers to be replaced by automated smart electricity meters
Answer: W) W) Customers to change their energy consumption patterns based on a varying rate of the cost of electricity
If a power station is referred to as an underground power station, what kind of energy does it generate? W) Hydroelectric X) Geothermal Y) Nuclear Z) Biomass
W: W) Hydroelectric
X: X) Geothermal
Y: Y) Nuclear
Z: Z) Biomass
Answer: W) W) Hydroelectric
In what constellation is our Galactic center located?
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Which of the following best describes the composition of Earth’s core? W) 78% silicon oxide X) Mainly iron silicates Y) An iron-nickel alloy Z) Mainly iron and potassium compounds
W: W) 78% silicon oxide
X: X) Mainly iron silicates
Y: Y) An iron-nickel alloy
Z: Z) Mainly iron and potassium compounds
Answer: Y) Y) An iron-nickel alloy
If the only method of introducing genetic variation into a sample population of E. coli is by spontaneous mutation, which of the following is the best way to increase the prevalence of beneficial mutations over many generations? W) Conjugation X) Binary fission Y) Transduction Z) Horizontal gene transfer
W: W) Conjugation
X: X) Binary fission
Y: Y) Transduction
Z: Z) Horizontal gene transfer
Answer: X) X) Binary fission
What is the name for skeletal muscle cells containing multiple nuclei?
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What is the name given to light produced when a charged particle passes through a material at a speed faster than the phase velocity of light in that material?
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Ignoring temperature changes, how much of a pressure increase, in pascals, does a diver feel at 100 meters below the surface of a fresh-water lake? W) 9,800 X) 98,000 Y) 980,000 Z) 9,800,000
W: W) 9,800
X: X) 98,000
Y: Y) 980,000
Z: Z) 9,800,000
Answer: Y) Y) 980,000
Which type of hybridization is found in the central atom of carbon dioxide? W) sp X) sp² Y) sp³ Z) sp⁴
W: W) sp
X: X) sp²
Y: Y) sp³
Z: Z) sp⁴
Answer: W) W) sp
What type of fluid undergoes large changes in density in response to small changes in pressure and temperature, and can be formed by heating carbon dioxide above 31 °C at pressures above 72.8 atmospheres?
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The complex number –4 lies on the boundary between what two quadrants in the complex plane?
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Solve the following equation for \(x\): \(-8 + \lvert 4 - 3x \rvert = 20\).
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