Free Practice Questions for SAF Officer Selection Aptitude

Explanation: To find the total number of cubes, calculate the count in each layer from the description. The bottom layer has 3 * 3 = 9 cubes, the second layer has 2 * 2 = 4 cubes, and the top layer has 1 cube. Adding these together yields 9 + 4 + 1 = 14 total cubes.

Explanation: A complete clock face is 360 degrees divided into 12 hours, meaning each hour mark represents 30 degrees. The distance between 12 and 3 is exactly 3 hour markings. Therefore, the angle is 3 * 30 = 90 degrees, forming a right angle.

Explanation: Folding left-to-right then top-to-bottom produces a 4-layer packet that is a quarter of the original sheet. The center of this folded packet does not lie on either fold crease (the creases run along two edges of the packet and meet at a corner). A single punch pierces all 4 layers at the same spot; because that spot is not on a fold line, each layer unfolds to a different quadrant, producing 4 separate holes arranged symmetrically.

Explanation: A cube consists of three pairs of opposite faces: front/back, top/bottom, and left/right. The left and right faces make up exactly one pair. Therefore, there are exactly 2 faces painted green.

Explanation: In its standard orientation, the three bars of the letter 'E' point to the right. A 90-degree counter-clockwise rotation makes them point upwards. Reflecting this shape horizontally (across a vertical mirror line) flips the left-right direction but does not change the vertical direction of the bars, so they continue to point upwards.

Explanation: A traffic cone is a cone with a circular base, tapering to a point. When viewed from directly above (an orthographic top view), the outer base edge and the top tip line up to project as concentric circles.

Explanation: Meshed gears always rotate in opposite directions. Since Gear A rotates clockwise, Gear B must rotate counter-clockwise. The rotation ratio is inversely proportional to the teeth count: (10 teeth / 20 teeth) * 4 rotations = 2 rotations.

Explanation: For a lever to balance, the clockwise torque must equal the counter-clockwise torque: Force1 * Distance1 = Force2 * Distance2. Here, 10 kg * 2 m = Weight2 * 1 m, which solves to Weight2 = 20 kg.

Explanation: In a parallel circuit, each bulb receives the full voltage of the battery. When rewired in series, the total resistance of the circuit doubles, halving the current, and the battery voltage is shared equally between the two bulbs. As a result, each bulb receives less power and glows dimmer.

Explanation: Copper is a metal with a high density of free electrons, making it an excellent electrical conductor, which is why it is widely used in electrical wiring. Rubber, glass, and wood are insulators with high resistance to electrical current.