Mix and Flow of Matter
When pressure is applied to a liquid, what happens to the spaces between the particles?
A) They do not change
B) They increase
C) They decrease
D) They decrease, then stabilize
C) They decrease
Which cell part helps plants make food?
A) Chloroplasts
B) Mitochondria
C) Nucleus
D) Cytoplasm
A) Chloroplasts
Which of the following is a characteristic of a concave lens?
A) Thinner in the middle, thicker edges
B) Causes light to converge
C) Thicker in the middle, thinner edges
D) Forms images upside down
A) Thinner in the middle, thicker edges
A machine that changes only the direction of a force (and not make it easier or harder) has a mechanical advantage of:
A) 100
B) 10
C) 5
D) 1
D) 1
Which adaptation helps marine animals (dolphins, whales, sea turtles, and sharks) survive in saltwater?
A) Thin fur
B) Gills only
C) Specialized kidneys to excrete salt
D) Hollow bones
C) Specialized kidneys to excrete salt
Why do ice tea granules dissolve in water?
A) They are equally attracted to both themselves and the water.
B) They are not attracted to either themselves or the water.
C) They are more attracted to each other than to the water.
D) They are more attracted to the water particles than to one another.
D) They are more attracted to the water particles than to one another.
Which is true about living things?
A) Reproduction always uses seeds
B) All reproduce the same way
C) Reproduction is necessaryto ensure continuity of species
D) All need mates to reproduce
C) Reproduction is necessaryto ensure continuity of species
What is the coloured part of the eye that controls pupil size?
A) Retina
B) Optic nerve
C) Pupil
D) Iris
D) Iris
What is the formula for calculating work done on an object?
A) Work = Distance × Mass
B) Work = Force × Distance
C) Work = Pressure × Area
D) Work = Mass ÷ Volume
B) Work = Force × Distance
What causes ocean water to be salty?
A) Evaporation of freshwater
B) Dissolved salts from rocks and soil
C) Seaweed
D) Underwater volcanoes
B) Dissolved salts from rocks and soil
Which of the following does not accurately describe a solid?
A) The particles of a solid cannot move around freely.
B) The particles have enough energy to pull away from one another.
C) Some solids form a pile when poured.
D) Solids have a definite volume.
B) The particles have enough energy to pull away from one another.
A plant bending toward sunlight shows:
A) Response to environment
B) Waste production
C) Reproduction
D) Growth
A) Response to environment
According to the first law of reflection, the angle of incidence is equal to the:
A) Angle of normal
B) Reflecting ray
C) Angle of reflection
D) Reflecting surface
C) Angle of reflection
Use this Work = Force × Distance to calculate:
If you push a 300 N (it's about 30kg) box up a 3 m ramp, how much work is done?
A) 100 J
B) 150 N
C) 900 J
D) 300 g
C) 900 J
Which human activity can lead to freshwater pollution?
A) Composting
B) Using solar panels
C) Dumping chemicals into rivers
D) Building wind turbines
C) Dumping chemicals into rivers
At its boiling point, a liquid becomes a:
A) Gas
B) Liquid
C) Solid
D) Plasma
A) Gas
If you see no cell wall under a microscope, the cell is likely:
A) A nucleus
B) A vacuole
C) An animal cell
D) A mitochondrion
C) An animal cell
What do we call the natural adjustment in the size of the pupils?
A) Accommodation
B) Optic nerve
C) Blind spot
D) Iris reflex
D) Iris reflex
Which of the following is a type of simple machine?
A) Pulley
B) Gearbox
C) Battery
D) Hydraulic arm
A) Pulley
Which of the following is NOT a way freshwater is stored on Earth?
A) Rivers
B) Glaciers
C) Oceans
D) Underground aquifers
C) Oceans
Viscosity of a liquid __________ when heated and __________ when cooled.
A) Increases, does not change
B) Decreases, increases
C) Decreases, does not change
D) Increases, decreases
B) Decreases, increases
What is the name given to the various structures found inside of all cells?
A) Organelles
B) Mitochondria
C) Nuclei
D) Chromosomes
A) Organelles
Which of the following best describes the term "ray"?
A) Light that passes through any substance
B) A straight line that represents the path of a beam of light
C) Light that is bent through a translucent object
D) An explanation of how light behaves
B) A straight line that represents the path of a beam of light
Why is a longer ramp helpful when lifting a heavy object (say into the back of a U-haul van)?
A) It increases the load
B) It reduces the work
C) It decreases the effort force needed
D) It makes the object lighter
C) It decreases the effort force needed
What percentage of Earth's water is freshwater?
A) 10%
B) 25%
C) 3%
D) 50%
C) 3%