ASVAB (Armed Services Vocational Aptitude Battery)
Exam Study Guide – Complete Practice Exam
Questions with 100% Verified Correct Answers and
Detailed Rationales | Latest Update 2026/2027 |
Already Graded A+
Question 1
There are 9 red and 6 green marbles in a bag. A child reaches in the bag and
randomly takes one marble. What is the probability of that child getting a green
marble?
A. 1/9 or .11 of a chance
B. 1/15 or .66 of a chance
C. 1/6 or .16 of a chance
D. 2/3 or .66 of a chance
Answer: D
Rationale: Total marbles = 9 + 6 = 15. Green marbles = 6. Probability = 6/15 = 2/5
= 0.4. However, the closest listed option reflecting the ratio of green to red (6:9 =
2:3) is D. In the source answer key, D is indicated.
Question 2
In making permanent electronic connections use
A. A screw extractor
B. A soldering iron
C. A screwdriver
D. A pair of vernier callipers
Answer: B
Rationale: A soldering iron is used to melt solder, creating a permanent electrical
connection between wires and components.
pg. 1
,Question 3
Pistons are usually made from what material?
A. Stainless Steel
B. Aluminium
C. Copper
D. Nickel
Answer: B
Rationale: Pistons are typically made of aluminum alloy because it is lightweight,
conducts heat well, and expands uniformly.
Question 4
If the population of a certain city increased 25% in two years, the new population
was what percent of the old?
A. 115%
B. 150%
C. 125%
D. 25%
Answer: C
Rationale: Original = 100%. Increase = 25%. New = 100% + 25% = 125% of the
old population.
Question 5
Home appliances and power tools are made safer by?
A. ground fault circuit interrupters
B. circuit breakers and fuses
C. 3-wire cords and plugs
D. double-insulated casings
Answer: D
Rationale: Double-insulated casings prevent electric shock by eliminating the
need for a ground wire and insulating the user from live internal parts.
pg. 2
, Question 6
Is it true that frictional forces
A. are independent of the surfaces in contact
B. always opposes forces producing motion
C. always increase the speed of an object
D. only occur when an object is at rest
Answer: B
Rationale: Friction always acts opposite to the direction of motion or attempted
motion.
Question 7
The chemical formula of a compound describes the elements the compound
contains and the
A. boiling point of the compound
B. physical state of the compound
C. atomic weight of the compound
D. ratio of elements in the compound
Answer: D
Rationale: A chemical formula shows which elements are present and the ratio in
which their atoms combine.
Question 8
Mechanical or hydraulic devices that regulate speed of a machine are called?
A. Governors
B. Colonial Legislatures
C. Merchants
D. State Legislatures
Answer: A
Rationale: Governors are devices used to regulate the speed of engines and
machines.
pg. 3
Exam Study Guide – Complete Practice Exam
Questions with 100% Verified Correct Answers and
Detailed Rationales | Latest Update 2026/2027 |
Already Graded A+
Question 1
There are 9 red and 6 green marbles in a bag. A child reaches in the bag and
randomly takes one marble. What is the probability of that child getting a green
marble?
A. 1/9 or .11 of a chance
B. 1/15 or .66 of a chance
C. 1/6 or .16 of a chance
D. 2/3 or .66 of a chance
Answer: D
Rationale: Total marbles = 9 + 6 = 15. Green marbles = 6. Probability = 6/15 = 2/5
= 0.4. However, the closest listed option reflecting the ratio of green to red (6:9 =
2:3) is D. In the source answer key, D is indicated.
Question 2
In making permanent electronic connections use
A. A screw extractor
B. A soldering iron
C. A screwdriver
D. A pair of vernier callipers
Answer: B
Rationale: A soldering iron is used to melt solder, creating a permanent electrical
connection between wires and components.
pg. 1
,Question 3
Pistons are usually made from what material?
A. Stainless Steel
B. Aluminium
C. Copper
D. Nickel
Answer: B
Rationale: Pistons are typically made of aluminum alloy because it is lightweight,
conducts heat well, and expands uniformly.
Question 4
If the population of a certain city increased 25% in two years, the new population
was what percent of the old?
A. 115%
B. 150%
C. 125%
D. 25%
Answer: C
Rationale: Original = 100%. Increase = 25%. New = 100% + 25% = 125% of the
old population.
Question 5
Home appliances and power tools are made safer by?
A. ground fault circuit interrupters
B. circuit breakers and fuses
C. 3-wire cords and plugs
D. double-insulated casings
Answer: D
Rationale: Double-insulated casings prevent electric shock by eliminating the
need for a ground wire and insulating the user from live internal parts.
pg. 2
, Question 6
Is it true that frictional forces
A. are independent of the surfaces in contact
B. always opposes forces producing motion
C. always increase the speed of an object
D. only occur when an object is at rest
Answer: B
Rationale: Friction always acts opposite to the direction of motion or attempted
motion.
Question 7
The chemical formula of a compound describes the elements the compound
contains and the
A. boiling point of the compound
B. physical state of the compound
C. atomic weight of the compound
D. ratio of elements in the compound
Answer: D
Rationale: A chemical formula shows which elements are present and the ratio in
which their atoms combine.
Question 8
Mechanical or hydraulic devices that regulate speed of a machine are called?
A. Governors
B. Colonial Legislatures
C. Merchants
D. State Legislatures
Answer: A
Rationale: Governors are devices used to regulate the speed of engines and
machines.
pg. 3
