NC Science Released Test (1-15)

NC Science Released Test (1-15)

Viruses are prevented by vaccines(dead/weak viruses) {influenza/flu shots}

Bacteria infections are cured with Antibiotics

• washing hands is the best defense to spreading viruses

Multiple Choice

Why do doctors suggest that people get a flu vaccine each year?

• viruses replicate more radpidly over time

• viruses can mutate from year to year

• vaccines are absorbed by the body after a year

• vaccines get stronger over time

Multiple Choice

Which of these organisms is a produces in a marine ecosystem?

• fish

• gull

• algae

• worm

Multiple Choice

Which of these careers would a student studying biotechnology most likely pursue?

• electrical engineering

• astronomy

• agriculture research

• geology

Multiple Choice

Which best determines the number of wolves that can live in an area?

• the amount of snow in the area each year

• the number of birds that live in the area

• the number of trees in the area

• the amount of food available in the area

Multiple Choice

What happens to a population and to competition when there is a reduction of living space?

• the population expands and competition intensifies

• competition strengthens while the population contracts

• the population increases as competition decreases

• competition weakens and the population decreases.

Atoms- smallest particle of matter

Elements- Pure substance (made of only 1 thing) found of periodic table

Compounds- 2 or more elements CHEMICALLY combined

Mixtures- two substances PHYSICALLY combined

• two types of mixtures (homogeneous/ heterogeneous)

Multiple Choice

Which is the best example of a pure substance?

• peanuts

• milk

• gold

• air

Periodic table is arranged in groups (up and down) and Periods (left to right).....

ALL ELEMENTS IN THE SAME GROUP HAVE SIMILAR PROPERTIES.

• METALS on the LEFT

• Most reactive on the LEFT

• Nonmetals on right

• Metalloids = staircase

• Halogen group 17

• Noble gases group 18

atomic number- top #... equals the number of protons AND electrons

• Atomic Mass- bottom (decimal)

• subtract top number and bottom number

Multiple Choice

Which statement best explains how periods on the periodic table are organized

• increasing atomic number from left to right

• increasing number of neutrons from left to right

• decreasing number of electrons left to right

• decreasing atomic mass number from left to right

Multiple Choice

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

• The molecules will begin to move slower

• the molecules will begin to move faster

• the molecules will begin to increase in density

• the molecules will begin to condense in the air

Law of Conservation= mass can not be created or destroyed. What you start with you have to finish with).

• precipitate- chemical reaction produces a solid (spoiled milk)

• mass may sometimes be less in an open system due to gas escaping from the container.

Multiple Choice

Which best explains why the total mass of the products would be less than the total weight of the reactant after a chemical reaction?

• a physical change occured

• atoms involved in the reaction lost mass

• precipitates were created in the new solution

• gases were released to the atmosphere

Multiple Choice

Which would least likely have an impact on global climate change?

• producing energy using hydroelectric plants

• producing energy using coal

• producing energy using oil

• producing energy using natural gas

Renewable energy- clean /less pollution.

• solar-sun

• wind-windmills

• hydroelectric-water/dam

• geothermal- heat from the earth

• biomass- living matter (plant/animal waste)

Nonrenewable Energy- can not be remade in your lifetime.... causes pollution (acid rain)

• burning coal (most of our energy comes from this process)

• burning fossil fuels

• natural gas/petroleum

• nuclear energy (causes toxic radiation)

• 
  

Multiple Choice

which is an example of a renewable energy resource?

• biomass

• coal

• gas

• oil

upwelling- cold nutrient rich water rises

• most fish caught in areas of upwelling

• increase nutrients means more fish

Multiple Choice

which will most likely result if there is upwelling in a coastal area?

• more aquatic life

• less nutrients in the water

• higher water temperatures

• fewer nitrates

Water quality/health

• turbidity- cloudiness of water

• temperature- colder water holds more oxygen

• dissolved oxygen- warmer water/ less oxygen

• pH- (0-14) acid or base (nitrates/nitrogen change pH levels)

• bioindicators- sensitive organisms (frogs, fish)

Multiple Choice

Which best determines the health of a lake used as a source of freshwater?

• its depther and width

• its temp and ph

• its location and depth

• its temp and depth

relative dating (approximate)

• index fossils (live short time, many, world wide)

• law of superposition (young on top old on bottom)

Multiple Choice

A scientists finds the bones of a dinosaur. What could help the scientist determine the approximate age of the dinosaur bones?

• the birds living in the area of the boens

• the weather conditions in the area of the bones

• the kinds of tree living in the area of the bones

• the index fossils in the area of the bones

Multiple Choice

Which best describes how ice cores are important to the study of geologic history?

• they show unconformities, which signal changes in deposition

• they hold index fossils which are used to date the different ice cores

• they contain evidence showing changes in the atmospheric composition over time

• they follow the law of superposition which gives reasons for extinction of species