Chapter 01: Basic Physics for the Respiratory Therapist
Cairo: Mosby’s Respiratory Care Equipment, 11th Edition
MULTIPLE CHOICE
1. Power is a measure of which of the following?
a. Mechanical energy
b. Gravitational potential energy
c. The rate at which work is being performed
d. The rate at which atoms and molecules move
ANS: C
Power is a measure of the rate at which work is being performed. The formula P = W/J, where
W = watts and 1 watt is equal to 1 J/s, expresses this. Joules are the international standard for
expressing energy and work.
2. When effort produces a change in the position of matter
a. work is performed.
b. it is known as a joule.
c. mechanical power is created.
d. the law of the conservation of energy is being used.
ANS: A
Work is performed only when effort or outside forces produce a change in the position of
matter.
3. The unit used to express the force of 1 N acting on a 1-kg object to move it 1 m is which of
the following?
a. Watt
b. Joule
c. Kilowatt
d. Kinetic energy (KE)
ANS: B
One joule is equal to the force of 1 N acting on 1 kg. A watt is equivalent to 1 J/s. A kilowatt is
simply 1000 W. KE is energy an object possesses when it is in motion.
4. Power is expressed in which of the following units?
a. Newtons
b. Joules
c. Ohms
d. Watts
ANS: D
Power is a measure of the rate at which work is being performed. Energy and work are
measured in joules. One joule is the force of 1 N acting on a 1-kg object to move it 1 m. Ohms
is the resistance an electrical circuit possesses.
5. The energy that an object possesses when it is in motion is called
a. sound.
, b. kinetic.
c. thermal.
d. potential.
ANS: B
KE is the energy an object possesses when it stays in motion. Potential energy is stored
energy, and it exists in many forms such as thermal energy or sound waves.
6. If the velocity of an object is reduced by half, its KE will be which of the following?
a. Reduced to one-eighth
b. Increased twofold
c. Reduced twofold
d. Not changed
ANS: A
Kinetic energy = 1/2(mass of object square of velocity it is traveling, or mv2) or KE = 1/2(V
V). If the velocity is reduced by half, then KE = 1/2(1/2V 1/2V), or 1/2(1/2) = 1/8
reduction.
7. Energy that is stored in an object is called which of the following?
a. Kinetic
b. Potential
c. Chemical
d. Mechanical
ANS: B
Energy that is stored or possessed by an object because of its position is called potential
energy. Mechanical energy can be divided into either KE or potential energy. Chemical
potential energy often refers to the bonds in petroleum oils that, if broken, can be converted to
KE.
8. The potential energy of a compressed spring is known as which of the following?
a. Gravitational
b. Chemical
c. Inelastic
d. Elastic
ANS: D
The potential energy stored in a compressed spring is called elastic potential energy. This
energy is released when the spring is allowed to uncoil. Gravitational potential energy is the
energy an object possesses if it is held above any surface, energy that the object’s weight gains
as it falls. Chemical potential energy resides in the chemical bonds of the atoms that make up
the object. Inelastic potential energy would not apply once the spring is compressed.
9. The energy stored in heating oil is known as which of the following?
a. Elastic
b. Atomic
c. Chemical
d. Gravitational
ANS: C
, Petroleum reserves of coal, oil, and gas represent chemical potential energy by virtue of the
chemical bond that must be broken to release energy. Heating oil potential energy has
chemical-to-chemical bonds. Atomic energy involves two processes—fission (splitting atoms)
and fusion (joining two atoms).
10. The kinetic theory holds that
a. all matter is composed of tiny particles.
b. elements combine in fixed proportions to form molecules.
c. the energy that an object gains as it falls is a result of gravity.
d. atoms and molecules that make up matter are in constant motion.
ANS: D
KE is the energy an object possesses while in motion.
11. Which is the correct order for increasing size?
a. Atoms, molecules, mixtures, compounds, elements
b. Atoms, elements, molecules, compounds, mixtures
c. Elements, atoms, molecules, compounds, mixtures
d. Atoms, elements, mixtures, molecules, compounds
ANS: B
All matter, whether in gas, liquid, or solid form, is made up of atoms that can combine to form
elements; the elements can then combine to form molecules. Molecules can combine to form
compounds. Combining compounds makes a mixture.
12. Atoms and molecules arranged in an orderly fashion are called
a. solids.
b. mixtures.
c. crystalline.
d. amorphous.
ANS: C
Crystalline solids are highly organized structures whose atoms and molecules are arranged in
a lattice configuration. Amorphous solids have atoms and molecules that are less rigidly
arranged.
13. The most potential energy is contained by which state of matter?
a. Gases
b. Solids
c. Liquids
d. Mixtures
ANS: B
Of all states of matter, solids contain the most potential energy; solids are followed by liquids
and then gases.
14. Supercooled liquids are also known as which of the following?
a. Elements
b. Compounds
c. Crystalline solids
d. Amorphous solids
, ANS: D
Amorphous solids are sometimes called supercooled liquids. Elements and compounds alone
can combine to form either crystalline or amorphous solids.
15. The least amount of KE is possessed by which one of the following?
a. Air
b. Iron
c. Water
d. Plastic
ANS: B
Of the three states of matter, solids possess the least amount of KE. The bonds holding their
atoms together limit the mobility of the particles that make up the solid.
16. The weakest cohesive forces between constituent particles are present in which of the
following?
a. Water
b. Plastic
c. Hydrogen
d. Liquid oxygen
ANS: C
Gases have extremely weak or no cohesive forces between their atoms. Hydrogen is the only
gas among the four choices.
17. What forces must be overcome for evaporation to occur?
1. The mass attraction of the molecules for each other
2. The pressure of the gas above the liquid
3. The decrease of KE
4. The pressure of the gas below the liquid
a. 1 and 4
b. 1 and 2
c. 2 and 3
d. 3 and 4
ANS: B
Two forces must be overcome for evaporation to occur: the mass attraction of the molecules
for each other (i.e., dipole–dipole interactions, hydrogen bonding, and Van der Waals forces)
and the pressure of the gas above the liquid.
18. The process whereby a solid directly becomes a gas is known as
a. latent heat.
b. sublimation.
c. evaporation.
d. condensation.
ANS: B
The direct change of state from solid to gas is called sublimation. Evaporation involves
change from liquid to gas. Latent heat involves a change of state in matter of any form.
19. Which two of the following are ways to increase the rate of evaporation?
1. Decrease the temperature of the liquid
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