ACT Science Practice Test - 6 - online test

When light travels from one medium into another, the light beam can be bent. This refers to

Dispersion

Reflection

Prism effect

Refraction

Refraction is when a light beam can be bent. The refracted angle is smaller if the medium is a higher optical density and larger if the medium is of lower optical density.

The number of cycles per unit time of a wave is

wave velocity

frequency

wavelength

altitude

The number of cycles per unit time of a wave is the frequency of a wave.

The outermost layer of the Earth is the crust. The crust has which of the following properties?

It is a liquid.

It is composed of iron and nickel.

It is the thickest layer of the Earth.

It is mainly composed of rocks.

The crust is the thinnest layer of the Earth. It has a thickness of 5 to 75 km. The crust is composed of rocks which are mainly made up of silicate minerals.

Density is defined as

the mass of a substance divided by the weight of a substance.

the volume of a substance divided by the mass of a substance

the volume of a substance divided by the weight of a substance

the mass of a substance divided by the volume of a substance.

Density is the mass of a substance divided by the volume of a substance.

Humans have ___________ pairs of chromosomes in each cell.

64

23

13

24

Humans have 23 pairs of chromosomes in each cell.

The site of photosynthesis in a plant is the

chloroplasts

stigma

stem

pollen

Photosynthesis occurs in the chloroplasts.

Covalent bonds involve the _________ of electrons.

transfer

combination

absorbtion

sharing

Covalent bonds involve the sharing of electrons instead of the transfer of electrons.

Which of the following is not a trait of an anabolism in the metabolism process?

Nutrients and molecules form complex molecules.

Uses simple sugars as building blocks for more complex molecules.

The process of breaking down complex molecules to release energy.

Uses amino acids as building blocks for more complex molecules.

Anabolism is the process in which simple molecules are used to form more complex molecules. Catabolism is the process of breaking down complex molecules to release energy.

When two like charges approach each other, they experience

an attractive force

a stronger bond

a repulsive force

a positive force

When two like charges approach each other they have a repulsive force between them. When two unlike charges approach each other they have a strong affinity for each other.

The volume of a gas varies

directly with temperature, inversely with pressure

inversely with both pressure and temperature

directly with both pressure and temperature

directly with pressure, inversely with temperature

The volume of a gas varies directly with temperature, inversely with pressure.