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DHORT : Discover Health Occupations Readiness Test Exam

Medical DHORT Questions & Answers
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Question: 97
What property of a metal refers to its ability to be hammered into sheets?
Ductility
Thermal conductivity
Electrical conductivity
Malleability
Density
Answer: D
Malleability refers to a metal's ability to be hammered into sheets.
Question: 98
Which of the following elements is most easily oxidized?
Nitrogen
Fluorine
Lithium
Neon
Sulfur
Answer: C
Easily oxidized elements readily release electrons. The loss of an electron allows these elements to form a stable valence electron configuration. In the context of this question, lithium is the most willing to release an electron, so it is the most easily oxidized.
Question: 99
The hamstrings are responsible for flexing which joint?
Knee
Hip
Shoulder
Elbow
Answer: A
The hamstrings are responsible for flexing the knee joint. The hamstrings consist of biceps femoris, semimembranosus and semitendinosus. They also assist in knee rotation.
Question: 100
What type of bonding does a molecule of NaCl display?
Ionic
Polar covalent
Nonpolar covalent
Metallic
Covalent metallic
Answer: A
NaCl is composed of two ions, Na+ and Cl-. Therefore, the molecule displays ionic bonding.
Question: 101
Which of the following compounds is classified as a metallic oxide?
H2O
Na2O
CO2
NO2
SO2
Answer: B
Metallic oxides consist of an oxygen atom bound to a metal. The only metal present in this question is sodium, so Na2O must be a metallic oxide.
Question: 102
A saturated solution of NaCl is heated until more solute can be dissolved. How is this solution best described?
Dilute
Immiscible
Supersaturated
Unsaturated
Hydrophobic
Answer: C
When a saturated solution is heated so more solute can be dissolved, the solution is described as supersaturated. Supersaturated solutions are typically unstable, and the solute can crash out of solution if a seed crystal is provided.
Question: 103
A 40.0 gram sample of a radioactive element decays to 5.0 grams in 15 hours. What is the half-life of this element?
3 hours
2 hours
6 hours
7.5 hours
5 hours
Answer: E
In 15 hours, this substance has decayed to 1/8 of its original mass. In other words, the substance has progressed through three half-lives (1/2 x 1/2 x 1/2 = 1/8). Thus, a single-half life for this substance is 5 hours.
Question: 104
Which of the following compounds contains a double bond?
C2H6
C2H4
C3H8
CH4
C4H10
Answer: B
Hydrocarbons with the formula CnH2n contain double bonds. The only compound with this formula, C2H4, must contain a double bond.
Question: 105
What is the duodenum responsible for?
Breaking down food in the small intestines
Cleans the blood
Creates bile
Absorbs oxygen
Answer: A
The duodenum is responsible for breaking down food in the small intestines.
Question: 106
80.0 grams of NaOH is dissolved in 3.0 moles of H20. What is the mole fraction
of NaOH in this solution?
.20
.37
.40
.64
.79
Answer: C
The mole fraction for a compound indicates (moles of given compund) / (total moles of system). In this question, there are two moles of NaOH and five total moles in the system. Thus, the mole fraction is expressed as 2/5, or .40.
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