Free ASVAB practice test

Answer: D. 18

Mass number is the total number of protons and neutrons. Counting eight protons and ten neutrons gives 18. Eight is the atomic number, ten is the neutron count, and subtracting the counts does not give mass number.

Answer: C. B, because slower cooling allows crystals more time to grow.

Site B is underground, where a large magma body generally cools more slowly. Slower cooling gives mineral crystals more time to grow, so intrusive rock commonly has larger visible crystals. Rapid cooling at the surface generally limits crystal growth; composition was held the same.

Answer: C. 3

There are 1 + 4 + 7 = 12 counters, so each of the 3 trays must finish with 4. Move 3 counters from the tray holding 7 to the tray holding 1; the middle tray already has 4. Fewer than 3 moves cannot remove all 3 excess counters from the largest pile. The answer 4 is the final count per tray, not the number moved.

Answer: D. $540

The six installments total 6 × $72 = $432. They cover 80% of the full price, since the deposit covered 20%. Thus the full price is $432 ÷ 0.80 = $540. The $432 choice omits the deposit, and multiplying by 0.80 would reduce a part that is already the remainder.

Answer: D. Select

Choose means select from possibilities. Describe means give an account of something, borrow means receive it temporarily, and arrange means put things in order. Those actions do not themselves mean making a selection.

Answer: D. Reject

Dismiss here means reject from consideration. The historian will not set the note aside solely because its author is unknown. Revise means change the wording, publish means make it publicly available, and deliver means bring it to a destination.

Answer: C. A group of people traveling together.

The six people share tickets, luggage, a destination, and a train, so party refers to their traveling group. The group is preparing to travel, not holding a celebration. No political activity is described. No lawsuit or dispute is involved in the journey.

Answer: A. A cutting from the current fabric.

The passage separates general comparison samples from a current-fabric cutting intended for an exact match. Larger samples show more surface, not a guaranteed match to the current dye batch. Additional packets still may contain samples from earlier batches. Each packet contains one color family, and multiple families would not establish an exact match.

Answer: B. −3x + 7

Inside the bracket, 2x − (3 − x) = 2x − 3 + x = 3x − 3. Then 4 − (3x − 3) = 7 − 3x. The other choices miss the outer sign change, the inner sign change, or the added 3.

Answer: D. 25

First evaluate the inside function: f(−2) = 3(−2) + 1 = −5. Then apply g to that result: g(−5) = (−5)² = 25. The 13 choice evaluates f(g(−2)) instead, reversing the order. The −5 choice stops after the first function.

Answer: D. Phototransistor

The collector/emitter transistor outline plus incoming light arrows identifies a phototransistor. A photoresistor is drawn as a light-sensitive resistor, a photodiode as a diode with light arrows, and an optocoupler encloses both an emitter and detector; none matches this single illuminated transistor symbol.

Answer: D. It interrupts large conducting loops and reduces eddy currents

Changing magnetic flux can induce circulating currents in a conducting core. Electrically insulated laminations restrict the available loop paths and reduce eddy-current losses. They do not connect the windings electrically or prevent the needed changing magnetic field.

Answer: B. B

B marks 55, the aspect ratio: nominal sidewall height is 55% of the tire’s width. A gives width in millimeters, C indicates radial construction, and D gives the wheel-rim diameter in inches.

Answer: D. Transfer heat through the wall while keeping the fluids separate

Heat passes from the hotter oil through the metal wall into the cooler coolant. The sealed passages prevent normal mixing. A leak across that wall would be a fault, not the intended way to cool the oil, and a solid heat-transfer wall is not a particle filter.

Answer: C. Mortise-and-tenon joint

The rectangular projection, or tenon, fits into a matching cavity, or mortise, in the other member. A dovetail has flared sides, a dowel is a separate round pin, and a plain butt joint has neither this projection nor the matching cavity.

Answer: C. Board B

In B the rings run mainly through the board’s thickness, so its width runs more nearly perpendicular to them. In A the rings lie more nearly along the width, the higher-shrinkage tangential direction described in the stem.

Answer: A. The air in A

Air is much more compressible than liquid water under these conditions. Both can change volume, but a modest pressure increase produces a much larger fractional change in the gas. Trapped air therefore makes a liquid-filled mechanism respond less rigidly.

Answer: D. 2.00 m

The center of mass is the mass-weighted mean position: (2 × 0 + 4 × 3)/(2 + 4) = 2 m from P. It lies nearer the heavier mass, not at the unweighted midpoint.

Answer: B. Diagram B

Diagram B joins each object at its original marked location. Follow the unequal neighboring edges around A and B and the curved boundary to identify those locations after rotation; preserve the connector’s segment lengths and turns. The other candidates attach at a different location on the A object, the B object, or both. A connector touching two boundaries is not enough: it must touch the specified points.

Answer: D. Diagram D

Diagram D preserves the boundary of every source piece under movement and rotation. Match the unequal edge lengths and the order of corners and curved edges around each piece, then trace the shared seams. All 4 pieces fit without overlap. The other alternatives reverse handedness, change edge proportions or curvature, or distort individual pieces; matching only the outside outline is insufficient.