Bone is composed primarily of which inorganic material?
a. calcium
b. phosphorus
c. collagen
d. potassium
Calcium
Calcium is the most abundant mineral found in bones, as well as in the entire body.
Which of these is a biome?
a. desert
b. cornfield
c. hear of bison
d. beehive
Desert
A biome is a large ecological community that includes specific plants and animals, such as a desert.
Which planet orbits closest to Earth?
a. Mercury
b. Venus
c. Jupiter
d. Saturn
Venus
Venus’s orbit is closest to Earth. Venus is the second planet from the sun, and Earth is the third planet from the sun.
What is the name of the phenomenon when a star suddenly increases in brightness and then disappears from view?
a. aurora
b. galaxy
c. black hole
d. supernova
Supernova
Before a star collapses, the star burns brighter for a period of time and then fades before view. This is a supernova.
Which organism has cells that contain mitochondria?
a. whale
b. mushroom
c. tulip
d. all of the above
All of the above
Plant, animal, and fungi cells have mitochondria.
Isotopes of an element will have the same number of and different numbers of _?
a. electrons; neutrons
b. neutrons; electrons
c. protons; neutrons
d. protons; electrons
Protons; neutrons
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
What condition can be diagnosed by an electrocardiogram (EKG)?
a. diabetes
b. torn ligaments
c. cancer
d. tachycardia
Tachycardia
Tachycardia is an abnormally fast heart rate, and electrocardiogram shows the electrical activity of the heart.
What are the negatively charged particles inside an atom?
a. protons
b. neutrons
c. electrons
d. ions
Electrons
Electrons are negatively charged particles in an atom; electrons orbit the nucleus.
Which organism regulates its body temperature externally?
a. lobster
b. dolphin
c. whale
d. pelican
Lobster
The metabolic rate of crustaceans is too low to regulate their temperature. Crustaceans use behavioral techniques, such as moving to shallow water, to maintain body temperature.
A box sliding down a ramp experiences all of the following forces EXCEPT?
a. tension
b. friction
c. gravity
d. normal
Tension
Tension is the force that results from objects being pulled or hung.
Which organism is a decomposer?
a. apple trees
b. mushrooms
c. goats
d. lions
Mushrooms
Mushrooms are fungi. Fungi break down organic material left by dead animals and plants making them decomposers
Which pH level is classified as a base?
a. 1
b. 4
c. 6
d. 8
8
Bases have a pH between 7 and 14.
Which body system is responsible for the release of growth hormones?
a. digestive system
b. endocrine system
c. nervous system
d. circulatory system
Endocrine system
The endocrine system releases hormones, including growth hormone.
What is the term for the top layer of the earth’s surface?
a. exosphere
b. lithosphere
c. atmosphere
d. biosphere
Lithosphere
The lithosphere is the top layer of the earth’s surface.
Which of the following describes a physical change?
a. water becomes ice
b. batter is baked into a cake
c. an iron fence rusts
d. a firecracker explodes
Water becomes ice
When water changes form, it does not change the chemical composition of the substance. Once water becomes ice, the ice can easily turn back into water.
Which energy source is nonrenewable?
a. water
b. wind
c. coal
d. sunlight
Coal
Coal is nonrenewable because once coal is burned, it cannot be quickly replaced.
How long does it take the earth to rotate on its axis?
a. one hour
b. one day
c. one month
d. one year
One day
Earth takes approximately twenty-four hours to rotate on its axis.
During what process do producers make sugars and release oxygen?
a. digestion
b. chloroplast
c. decomposition
d. photosynthesis
Photosynthesis
Photosynthesis describes the process by which plants convert the energy of the sun into stored chemical energy (glucose).
2C6H14+19O2->12CO2+14H2O
a. substitution reaction
b. acid-base reaction
c. decomposition reaction
d. combustion reaction
Combustion reaction
Combustion is defined as a reaction in which a hydrocarbon reacts with O2 to produce CO2 and H2O.
Which factor is an abiotic part of an ecosystem?
a. producers
b. consumers
c. water
d. decomposers
Water
Nonliving things in an ecosystem, like air and water, are abiotic factors.
What is the primary function of the respiratory system?
a. to create sound and speech
b. to take oxygen into the body while removing carbon dioxide
c. to transport nutrients to the cells and tissues of the body
d. to act as a barrier between the body’s organs and foreign pathogens
To take oxygen into the body while removing carbon dioxide
Oxygen intake and carbon dioxide disposal are the primary function of the respiratory system.
The process of organisms with advantageous traits surviving more often and producing more offspring than organisms without these advantageous traits describes which basic mechanism of evolution?
a. gene flow
b. genetic drift
c. mutation
d. natural selection
Natural selection
The mechanism of natural selection is rooted in the idea that there is variation in inherited traits among a population of organisms and that there is differential reproduction as a result.
Which muscular organ processes food material into smaller pieces and helps mix it with saliva?
a. pharynx
b. tongue
c. diaphragm
d. stomach
Tongue
The tongue is the muscle that helps break apart food, mix it with saliva, and direct it toward the esophagus.
Which of the following correctly describes a strong acid?
a. A strong acid completely ionizes in water
b. A strong acid donates more than one proton
c. A strong acid has a pH close to 7
d. A strong acid will not ionize
A strong acid completely ionizes in water
Strong acids break apart into their constituent ions immediately when placed in water.
Which action is an example of mechanical weathering?
a. Calcium carbonate reacts with water to form a cave
b. An iron gate rusts
c. Tree roots grow under the foundation of a house cause cracks
d. Bananas turn brown after they are peeled
Tree roots grown under the foundation of a house cause cracks
Mechanical weathering involves breaking a substance down without changing the composition of the substance.
A high school cross country team sent 25% of its runners to a regional competition . Of these, 10% won medals. If 2 runners earned medals, how many members does the cross country team have?
a. 8
b. 10
c. 80
d. 125
Convert 55 meters to feet (round to the nearest tenth of a foot)
a. 16.8 feet
b. 21.7 feet
c. 139.7 feet
d. 180.4 feet
If a person reads 40 pages in 45 minutes, approximately how many minutes will it take her to read 265 pages?
a. 202
b. 236
c. 265
d. 298
If three burgers and two orders of fries cost $26.50 and a burger costs $6.50, how much does one order of fries cost?
a. $1.75
b. $3.50
c. $6.75
d. $7.00
A work was paid $15,036 for 7 months of work. If he received the same amount each month, how much was he paid for the first 2 months?
a. $2,148
b. $4,296
c. $5,137
d. $6,444
The average speed of cars on a highway (s) is inversely proportional to the number of cars on the road (n). If a car drives at 65 mph when there are 250 cars on the road, how fast will a car drive when there are 325 cars on the road?
a. 50 mph
b. 55 mph
c. 60 mph
d. 85 mph
The probability of drawing a blue marble from a bag of marbles is 1/20 and the probability of drawing a red marble from the same bag is 7/20. What is the probability of drawing a blue marble or a red marble?
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The population of a town was 7,250 in 2014 and 7,375 in 2015. What was the percent increase from 2014 to 2015 to the nearest tenth of a percent?
a. 1.5%
b. 1.6%
c. 1.7%
d. 1.8%
Lynn has 4 test scores in science class. Each test is worth 100 points, and Lynn has an 85% average. If Lynn scored 100% on each of the first 3 tests, what did she score on her 4th test?
a. 40%
b. 55%
c. 60%
d. 85%
Allison used 2 1/2 cups of flour to make a cake, and 3/4 of a cup of flour to make a pie. If she started with 4 cups of flour, how many cups of flour does she have left?
a. 3/4
b. 1
c. 5/4
d. 5/2
Alex cleans houses and charges $35 per bathroom and $40
If there are 3 quarts of gas in a gallon container, how full is the container?
If x + y = 2 and x − y = 1, then
The rotor of a generator moves inside a circle of a
The coolant in a car flows through the
Air is less dense than water because
its molecules are further apart
Salt helps to melt ice because it
lowers the temperature at which water freezes
His record provides no reason for -apprehension-
a block has a length of 8, width of 3 and a height of 4, what is the volume?
Shock absorbers on a car connect the axle to the
the tip should be pushed further into the cylinder
prevent high spots and ridges on sanded surfaces.
Which handsaw should be used to make a rough cut with the grain in a thick board?