ASVAB General Science Practice Test 738428 Results

Your Results Global Average
Questions 5 5
Correct 0 3.17
Score 0% 63%

Review

1

The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?

70% Answer Correctly

refraction

Doppler effect

reflection

sound radiation
Solution

The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.

2

Elements that belong to the same period in the Periodic Table of the Elements have the same number of:

50% Answer Correctly

protons

atomic mass units

electron shells

electrons
Solution

The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number. 

3

An element in the physical state of __________ maintains neither a constant volume nor a constant shape.

75% Answer Correctly

plasma

liquid

gas

solid
Solution

The gaseous state occurs at a higher temperature range than the solid and liquid states of the same substance. In this state, molecules flow very freely around each other and will spread out as far as they're able. Gases maintain neither a constant volume nor a constant shape.

4

Molecules and atoms that are outputs from a chemical reaction are known as which of the following?

56% Answer Correctly

products

side effects

reactants

results
Solution

During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).

5

pH is a scale that measures of how basic or acidic a solution is. A solution with a pH of 9 is:

67% Answer Correctly

alkaline

water

neutral

acidic
Solution

An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.