The brakes in a car work because of
a. Archimedes' principle
b. Pascal's principle
c. Bernoulli's principle
d. Torricelli's principle
e. none of these principles
[Ques. 2] The buoyant force that keeps a ship afloat is an example of
a. Archimedes' principle
b. Pascal's principle
c. Bernoulli's principle
d. Torricelli's principle
e. none of these principles
[Ques. 3] How many elements have been identified?
a. 92
b. 104
c. 114
d. over 200
e. none of the above
[Ques. 4] What elements do the symbols Fe, Na, Au, and Hg stand for?
a. aluminum, nitrogen, silver, tungsten
b. iron, sulfur, silver, ytterbium
c. iron, sodium, silver, mercury
d. iron, sodium, gold, mercury
e. none of the above
[Ques. 5] What elements do the symbols H, O, C, and N stand for?
a. hydrogen, ozone, carbon, nitrogen
b. hydrogen, oxygen, chlorine, nitrogen
c. hydrogen, oxygen, carbon, natrium
d. hydrogen, oxygen, carbon, nitrogen
e. none of the above
[Ques. 6] In the chemical formula for water, H2O, what does the 2 mean?
a. There are two oxygen (O) atoms in a molecule of water.
b. There are two hydrogen (H) atoms in a molecule of water.
c. The hydrogen in water is actually deuterium.
d. none of the above
[Ques. 7] DNA is a complex
a. atom
b. molecule
c. life form
d. mystery
e. acronym
[Ques. 8] The molecule is the basic unit of all
a. elements c. mixtures
b. compounds d. solutions
[Ques. 9] About how big is an atom?
a. too small to measure
b. about a millionth of a meter across
c. about a billionth of a meter across
d. about a trillionth of a meter across
e. none of the above
[Ques. 10] The particle that orbits the central core inside an atom is the
a. electron
b. proton
c. neutron
d. nucleus
e. none of the above
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