Science Practice Tests

Question 1

Natural selection

Adaptation

Answer 1

Natural selection is a mechanism, or cause, of evolution. Adaptations are physical or behavioral traits that make an organism better suited to its environment

Question 2

Vacuum

Answer 2

Vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).

Question 3

Stoichiometry

Answer 3

the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.

Question 4

Unit prefixes

Answer 4

Kilo 1,000
Hecta 100
Deka 10

Deci .1
Centi .01
Mili . 001

Question 5

Photosynethesis Reaction

Answer 5

Carbon dioxide + Water + Light = Glucose + Oxygen

Question 6

Magnets:
Same charge
Opposite charge

Answer 6

Same charge repels

Opposite charge attracts