Question 1

What is the sum of the exterior angles of an eight-sided traverse?
A)180°
B)1,440°
C)1,800°
D)None of the above

Accepted Answer

Use the sum of exterior angles of a polygon equation: S = (n+2) x 180°
Where n = 8
S = (8+2) x 180°
= 1,800°

Question 2

The Concrete Reinforcing Steel Institute (CRSI) recommends that a reinforcing bar (rebar) inspection program be established for all construction projects where reinforcing bars are used. An appropriate checklist for rebar inspection is recommended that includes which of the following items, in addition to those listed below? Construction schedule
Certified mill test and/or bar coating report
Material shipment schedule
Potential concerns (possible discrepancies, drawing errors)
Critical tolerances
Periodic meeting schedule
A)Independent testing laboratory reports
B)Approved placing drawings
C)A) and B.
D)None of the above

Accepted Answer

An appropriate checklist for rebar inspection is recommended that includes the listed items, independent testing laboratory reports, and approved placing drawings. CRSI recommends that a checklist procedure and the minimum requirements for rebar acceptance should be established during the pre-construction conference. These quality control measures will help to ensure that the rebar used will meet specific material standards and the project owner's requirements.

Question 3

A slope measurement of 814.20 ft is recorded and an angle measured with a hand level is 6°30'. What is the horizontal distance H for this slope distance?
A)807.70 ft
B)807.90 ft
C)808.96 ft
D)820.5 ft

Accepted Answer

The horizontal distance H for a slope measurement of 814.20 ft and angle of 6°30' is 808.96 ft.
Solution
Use the horizontal distance formula H = L cos a
Where L = 814.20 ft
A = 6°30'
Step 1
Convert angle 6°30' to DMS: 6°30' = 6.5°
Step 2
H = L cos 6.5 = (814.20 ft)(0.994) = 808.96 ft

Question 4

Which of the following elements is most easily oxidized?
A)Nitrogen
B)Fluorine
C)Lithium
D)Neon
E)Sulfur

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 5

What is the porosity of a dry soil sample that weighs 950 grams (g) and has an undisturbed volume of 900 cubic centimeters (cm³)? Assume a particle density of 2.65 g/cm³. A)56% B)60% C)62% D)Not enough information provided

Accepted Answer

The porosity of a 950 g dry soil sample, with an undisturbed volume of 900 cm³ and a particle density of 2.65 g/cm³, is 60%. The porosity of a soil is the ratio of the volume of soil pores to the total soil volume, and the soil porosity values range from 0 to 1. Solution: Use the following equation to determine porosity, n n = 1 - bulk density / particle density = 1 - Db / Dp Given Dp = 2.65 Therefore, n = 1 - [(Mass of dry soil / volume of solids and pore spaces)/ 2.65] = 1 - [(950 g) / (900 cm³)] / 2.65 g/cm³ x 100 n = 60%

Question 6

In traverse computations, the sum of angles in closed figures equals which of the following? (Assume n = number of sides)
A)(n+2) x 180°
B)(n+1) x 180°
C)(n-1) x 180°
D)(n-2) x 180°

Accepted Answer

In traverse computations, the sum of angles in closed figures equals (n-2) x 180°. Closed traverses are polygonal in shape, and therefore the sum of interior angles of a polygon equation applies: S = (n-2) x 180°.

Question 7

Which of the following statements are true with regards to bits and bytes?
A)A byte consists of a single numeric value; a bit is a sequence of bytes.
B)A bit consists of a single numeric value; a byte is a sequence of bits.
C)A bit consists of a single numeric value; a byte consists of an alphanumeric value.
D)None of the above

Accepted Answer

A bit is a single numeric value; a byte consists of a sequence of bits. The terms bits and bytes refer to digital data that, when grouped together, form binary code. Bits are assigned a value of either "0" or "1." There are usually eight bits in one byte.

Question 8

Which of the following is the correct molecular formula for hydrobromic acid?
A)HBrO
B)HBr
C)H?Br
D)H?OBr
E)H?O?Br

Accepted Answer

The nomenclature system for acids is fairly simple. The "hydro" refers to the hydrogen while the "bromic" refers to the bromine. The correct formula is HBr.

Question 9

Which of the following families contains characteristically nonreactive elements?
A)Alkali metals
B)Alkaline earth metals
C)Halides
D)Halogens
E)Noble gases

Accepted Answer

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

Question 10

Which of the following metals reacts explosively when placed in water?
A)Manganese
B)Silver
C)Zinc
D)Sodium
E)Chromium

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 11

What type of bonding does a molecule of NaCl display?
A)Ionic
B)Polar covalent
C)Nonpolar covalent
D)Metallic
E)Covalent metallic

Accepted Answer

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

Question 12

80.0 grams of NaOH is dissolved in 3.0 moles of H?0. What is the mole fraction of NaOH in this solution?
A).20
B).37
C).40
D).64
E).79

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 13

A saturated solution of NaCl is heated until more solute can be dissolved. How is this solution best described?
A)Dilute
B)Immiscible
C)Supersaturated
D)Unsaturated
E)Hydrophobic

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 14

The half-life of 32 grams of a radioactive substance is 6.5 hours. How many grams of the substance remain after 19.5 hours?
A)16 grams
B)8 grams
C)4 grams
D)2 grams
E)32 grams

Accepted Answer

The half-life of a substance is the amount of time required for the substance to decay to half of its original mass. In the context of the question, 19.5 hours represents three half-lives. Therefore, the substance will be reduced to (1/2)3 or 1/8 its original mass. 1/8 x 32 gives the correct answer of 4 grams.

Question 15

Which of the following compounds is classified as a metallic oxide?
A)H?O
B)Na?O
C)CO?
D)NO?
E)SO?

Accepted Answer

Metallic oxides consist of an oxygen atom bound to a metal. The only metal present in this question is sodium, so Na?O must be a metallic oxide.

Question 16

What property of a metal refers to its ability to be hammered into sheets?
A)Ductility
B)Thermal conductivity
C)Electrical conductivity
D)Malleability
E)Density

Accepted Answer

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

Question 17

Which of the following straight-chain hydrocarbons is classified as saturated? A)C₂H? B)C?H₈ C)C?H₆ D)C₅H₁₀ E)C₂H₆

Accepted Answer

Saturated straight-chain hydrocarbons contain only single bonds. As long as the saturated hydrocarbon does not contain a ring, it will obey the formula C_nH_?n+2. Thus, the saturated straight-chain hydrocarbon is C₂H₆.

Question 18

The half-life of 14 grams of a substance is 3 hours. How many grams of the substance remain after 6 hours?
A)3)5 grams
B)7)0 grams
C)14 grams
D)28 grams
E)7)5 grams

Accepted Answer

The half-life of a substance is the amount of time required for that substance to decay to half of its original mass. In the context of this question, 6 hours represents two half-lives. Therefore, the substance will decay to one-fourth of its original mass, or 3.5 grams.

Question 19

Which of the following acids is classified as weak? A)CH₃COOH B)HCl C)HBr D)HClO? E)H?SO?

Accepted Answer

A weak acid is an acid that does not dissociate completely in solution. HCL, HBr, HClO?, and H?SO? are strong acids. CH₃COOH is the weak acid.

Question 20

What is the oxidation state of chlorine in potassium perchlorate, KClO??
A)-7
B)-3
C)0
D)3
E)7

Accepted Answer

Begin this problem by considering the oxidation state of oxygen. As in most oxides, oxygen has an oxidation state of -2. Multiply this value by four to account for all of the oxygens, giving a total oxidation value of -8. Potassium has an oxidation state of +1, bringing the total oxidation value to -7. In order to maintain electrical neutrality, chlorine must have an oxidation state of +7.

Quiz 1: Engineering and Science

What is the sum of the exterior angles of an eight-sided traverse?

A slope measurement of 814.20 ft is recorded and an angle measured with a hand level is 6°30'. What is the horizontal distance H for this slope distance?

Which of the following elements is most easily oxidized?

What is the porosity of a dry soil sample that weighs 950 grams (g) and has an undisturbed volume of 900 cubic centimeters (cm³) ? Assume a particle density of 2.65 g/cm³.

In traverse computations, the sum of angles in closed figures equals which of the following? (Assume n = number of sides)

Which of the following statements are true with regards to bits and bytes?

Which of the following is the correct molecular formula for hydrobromic acid?

Which of the following families contains characteristically nonreactive elements?

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

What type of bonding does a molecule of NaCl display?

80.0 grams of NaOH is dissolved in 3.0 moles of H?0. What is the mole fraction of NaOH in this solution?

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

The half-life of 32 grams of a radioactive substance is 6.5 hours. How many grams of the substance remain after 19.5 hours?

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

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

Which of the following straight-chain hydrocarbons is classified as saturated?

The half-life of 14 grams of a substance is 3 hours. How many grams of the substance remain after 6 hours?

Which of the following acids is classified as weak?

What is the oxidation state of chlorine in potassium perchlorate, KClO??