ASVAB Study GuideGeneral Science Practice Test 8
Tap an answer to check it instantly and read the explanation. 10 questions: 3 easy, 4 medium and 3 hard.
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Question 1 easy
Which formula is used to calculate acceleration?
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Correct answer: A — $$a = \frac{v}{t}$$
Acceleration is defined as the change in velocity over time, expressed by the formula $$a = \frac{v}{t}$$ (or $$a = \frac{\Delta v}{\Delta t}$$).
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Question 2 easy
Which of the following elements has an atomic number of 1?
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Correct answer: A — hydrogen
Hydrogen is the simplest element on the periodic table and has the lowest atomic number, which is 1.
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Question 3 easy
What is the term for a substance that undergoes change during a chemical reaction?
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Correct answer: B — reactant
Reactants are the starting substances that undergo chemical changes during a reaction to form products.
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Question 4 medium
According to Newton's First Law of Motion, an object at rest will remain at rest unless it is acted upon by
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Correct answer: B — an net unbalanced force.
An object at rest stays at rest unless a net unbalanced external force acts on it to change its state of motion.
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Question 5 medium
A solution with a pH of 2 is
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Correct answer: A — more acidic than a solution with a pH of 5.
On the pH scale, lower values represent higher hydrogen ion concentrations. Therefore, a pH of 2 is more acidic than a pH of 5.
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Question 6 medium
What is the term for a phase transition in which a substance changes directly from a solid state to a gas state?
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Correct answer: C — sublimation
Sublimation is the endothermic phase transition where a solid turns directly into a gas without passing through the liquid phase (e.g., dry ice).
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Question 7 medium
How should the chemical formula H₂SO₄ be interpreted regarding its atomic composition?
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Correct answer: A — Two hydrogen atoms, one sulfur atom, and four oxygen atoms.
The subscript numbers indicate the number of atoms of each element: 2 hydrogen (H), 1 sulfur (S), and 4 oxygen (O) atoms.
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Question 8 hard
How many total atoms are present in a single molecule of the chemical compound Al₂(SO₄)₃?
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Correct answer: B — 17
In Al₂(SO₄)₃, there are 2 Al atoms. Inside the parentheses, 1 sulfur and 4 oxygen atoms make 5 atoms, multiplied by 3 gives 15 atoms. Total = $$2 + 15 = 17$$ atoms.
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Question 9 hard
According to Newton's law of universal gravitation, what happens to the gravitational force between two point masses if the distance between their centers is tripled?
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Correct answer: B — The force is reduced to one-ninth of its original value.
Gravitational force is inversely proportional to the square of the distance ($$F \propto \frac{1}{r^2}$$). If distance is tripled $$(3r)$$, the force becomes $$(\frac{1}{3})^2 = \frac{1}{9}$$ of the original.
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Question 10 hard
In a closed thermodynamic system undergoing an adiabatic expansion, which of the following statements is strictly correct?
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Correct answer: B — No heat is transferred, and the internal energy of the system decreases as it performs work.
In an adiabatic process, heat transfer $$Q = 0$$. When a gas expands and does work on its surroundings (W > 0), by the first law of thermodynamics ($$\Delta U = Q - W$$), its internal energy must decrease, resulting in a temperature drop.