JDF Recruit Assessment flashcards
JDF Recruit Assessment · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Contrapositive
- The logically equivalent form of 'if P then Q', namely 'if not Q then not P'. It preserves truth; the converse and inverse do not.
- Sufficient condition
- A condition whose presence guarantees the outcome. It differs from a necessary condition, which the outcome cannot occur without.
- Main conclusion
- The central claim a passage argues for, supported by the remaining sentences. Other sentences serve as evidence, restatement, or background.
- Analogy relationship
- The specific link between a pair of words, such as part-to-whole, cause-to-effect, function, or degree. The correct option must share that same link.
- Percentage change
- Calculated as (new value minus old value) divided by old value, then multiplied by 100. A positive result is an increase.
- Speed conversion
- To change kilometres per hour into metres per second, multiply by 5/18. For example, 36 km/h equals 10 m/s.
- Compound growth formula
- Final amount equals starting amount multiplied by (1 plus rate) raised to the number of periods. Interest is earned on accumulated interest.
- Combined work rate
- When two workers complete a job in a and b hours separately, together they take ab divided by (a plus b) hours.
- Lever balance rule
- Effort multiplied by effort arm equals load multiplied by load arm. Lengthening the effort arm reduces the force needed to lift a load.
- Mechanical advantage
- The ratio of load to effort in a machine. A value above one means the machine multiplies the applied force.
- Gear ratio
- Teeth on the driven gear divided by teeth on the driver gear. Meshed gears rotate in opposite directions at speeds set by this ratio.
- Pressure formula
- Pressure equals force divided by area. The same force spread over a smaller area produces a higher pressure.
- Buoyancy and floating
- An object floats when the upward buoyant force equals its weight. It sinks when its density exceeds that of the surrounding fluid.
- Cube properties
- A cube has six square faces, twelve edges, and eight vertices. A valid net contains exactly six squares that fold without overlap.
- Reflection versus rotation
- Rotation preserves size, angles, and orientation. Reflection preserves size and angles but reverses handedness, producing a mirror image.
- Rotational symmetry order
- The number of times a shape maps onto itself during a full 360-degree turn. A square has order four; a circle has infinite order.
- Folding and punching
- Each fold doubles the number of holes made by a single punch. The pattern mirrors across every fold line on the unfolded sheet.
- Orthographic views
- Top, front, and side projections of an object. Each view shows only two of the three dimensions, so together they define the shape.
- UK Parliament structure
- The UK legislature has two chambers: the elected House of Commons and the appointed House of Lords. The monarch formally assents to laws.
- NATO Article 5
- The collective-defence clause stating that an armed attack on one member is treated as an attack on all members of the alliance.
- United Nations Security Council
- The UN body responsible for international peace and security, with five permanent and ten elected member states.
- Commonwealth
- A voluntary association of 56 member states, most sharing historic links with the British Empire, promoting cooperation and development.
- Geneva Conventions
- A set of international treaties setting rules for armed conflict, including protection of civilians, wounded soldiers, and prisoners of war.
- Body mass index
- Mass in kilograms divided by height in metres squared. For adults, 18.5 to 24.9 is classed as a healthy weight range.
- Target heart rate
- An exercise intensity guide of roughly (220 minus age) multiplied by 0.6 to 0.8, giving moderate to vigorous aerobic training zones.
- Shuttle run
- An agility test involving repeated sprints between markers with rapid direction changes. Faster completion times indicate better change of direction.
- Multi-stage fitness test
- A progressive shuttle-run test using timed bleeps to estimate aerobic capacity (VO2 max) from the level reached before exhaustion.
- Running pace
- Time taken divided by distance covered. A 2.4 km run completed in 12 minutes equals a pace of 5 minutes per kilometre.
- Necessary versus sufficient
- A necessary condition must be present for an outcome; a sufficient condition guarantees it. One may exist without the other.
- Inference question rule
- Accept only conclusions that must be true given the passage. Statements that are merely likely or plausible are incorrect answers.
- Simple interest
- Interest calculated only on the original principal: principal multiplied by rate multiplied by time. It ignores interest already accrued.
- Finding original value
- After a percentage change, divide the final value by (1 plus or minus the change) to recover the starting amount.