Question 1

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
The first war between India and Pakistan began in 1947 and continued until 1949, when the United Nations stepped in and broker a ceasefire.

Accepted Answer

The best choice is "brokered"
The other verbs in this sentence - "began," "continued" and "stepped" are past tense forms of verbs. Therefore, "brokered," the past tense form of "broker," fits within the sentence's structure.

Question 2

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A.
On the day of the attack three cruisers, two tankers, two battleships, six aircraft carriers, and nine destroyers sailed to a point north of Hawaii.

Accepted Answer

The best choice is "On the day of the attack, three cruisers"
A comma is needed to set off the introductory phrase "On the day of the attack" from the main part of the sentence. A comma is unnecessary after "day," and a semicolon does not properly complete the sentence.

Question 3

What is 1 ½ as a simple fraction in lowest terms?

Accepted Answer

1 ½ as a simple fraction in lowest terms is 3/2. 1 ½ is a mixed fraction. To simplify it, you multiply the denominator (2) by the whole number (1) and then add the product (2) to the numerator (1): 2 x 1 = 2, then 2 + 1 = 3. Put your answer over the denominator (2). The answer is 3/2.

Question 4

What is the duodenum responsible for?

Accepted Answer

The duodenum is responsible for breaking down food in the small intestines.
At 10-12 inches long, it is the smallest part of the small intestines. It regulates the rate at which the stomach empties.

Question 5

80)0 grams of NaOH is dissolved in 3.0 moles of H20. What is the mole fraction of NaOH in this solution?

Accepted Answer

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.

Question 6

Which of the following compounds contains a double bond?

Accepted Answer

Hydrocarbons with the formula C_nH_2n contain double bonds. The only compound with this formula, C₂H₄, must contain a double bond.

Question 7

A saturated solution of NaCl is heated until more solute can be dissolved. How is this solution best described?

Accepted Answer

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 8

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?

Accepted Answer

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 9

Which of the following metals reacts explosively when placed in water?

Accepted Answer

Solve this question with your knowledge of the periodic table. The most reactive family of metals is the alkali metals. In the context of the question, only one metal is part of this family, sodium. Thus, sodium will react explosively when placed in water.

Question 10

Which of the following families contains characteristically nonreactive elements?

Accepted Answer

The noble gases are characteristically nonreactive. They contain a full octet of electrons and typically do not react with other elements.

Question 11

Which of the following compounds is classified as a metallic oxide?

Accepted Answer

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 12

If the father's blood type is AB and the mother's blood type is homozygous B, what is the percent likelihood that their offspring will exhibit type B?

Accepted Answer

50%. There is a two out of four chance that the child will have B blood type.
Key takeaway: Using the Punnett square, it is immediately evident that the child will only have B or AB blood type. The father can donate either an A allele or a B allele, whereas the mother can only donate a B allele. It is shown below that the child is 50% likely to have a B blood type.
A | B
B AB | BB
-------- | -------
B AB | BB

Question 13

Which of the following is considered to be an endocrine gland?

Accepted Answer

testis. The testis produces and secretes the hormone testosterone.
Key Takeaway: An endocrine gland is an organ that produces and secretes hormones into the blood stream. This is opposed to exocrine glands such as the salivary gland. The salivary gland secretes substances into ducts. The heart, liver, and lung are all essential to life processes, but none secrete hormones into the bloodstream.

Question 14

Which of the following is the correct order of development of a fertilized egg?

Accepted Answer

zygote-morula-blastula-embryo. This is the development pattern of fertilized eggs in humans.
Key Takeaway: The zygote is formed when the egg fuses with the sperm, creating a single, diploid cell. The zygote then divides by mitosis until a solid ball of cells known as the morula develops.
Further development of this ball into a more organized state results in formation of the blastula. As development continues, cells of the inner core of the blastula go on to form the embryo. By only remembering that the zygote is the first stage and the embryo is the last stage, a student can eliminate three of the choices immediately.

Question 15

What type of bonding does a molecule of NaCl display?

Accepted Answer

NaCl is composed of two ions, Na⁺and Cl^-. Therefore, the molecule displays ionic bonding.

Question 16

Which of the following elements is most easily oxidized?

Accepted Answer

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 17

Which of the following is the correct molecular formula for magnesium phosphate?

Accepted Answer

Phosphate is a polyatomic anion with the molecular formula PO₄^3-, and magnesium typically takes an oxidation state of +2. The simplest way to balance these charges gives the correct molecular formula, Mg₃(PO₄)₂.

Question 18

What property of a metal refers to its ability to be hammered into sheets?

Accepted Answer

Malleability refers to a metal's ability to be hammered into sheets.

Question 19

Which of the following acids is classified as weak?

Accepted Answer

A weak acid is an acid that does not dissociate completely in solution. HCL, HBr, HClO₄, and H₂SO₄ are strong acids. CH₃COOH is the weak acid.

Question 20

Which veins return deoxygenated blood from the head to the heart?

Accepted Answer

The jugular veins return deoxygenated blood from the head to the heart. There are two, one on each side of the neck. They are superficial to the sternocleidomastoid, and are easily palpable. Deep massage in the neck must be careful not to disturb the flow of these veins.

Quiz 1: Health Occupations Basic Entrance (HOBE)

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A. The first war between India and Pakistan began in 1947 and continued until 1949, when the United Nations stepped in and broker a ceasefire.

Choose the answer which best rewords the italicized portion. If you think the original wording is best, choose option A. On the day of the attack three cruisers, two tankers, two battleships, six aircraft carriers, and nine destroyers sailed to a point north of Hawaii.