ie-df-recruit-aptitude flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Cannot Say response

The correct choice when the passage neither confirms nor contradicts a statement. Real-world plausibility is irrelevant; only explicit textual support or contradiction decides True or False.

Quantifier shift

A change in words like all, most, some, or none between passage and statement. Overstated or narrowed quantifiers typically make the statement False or Cannot Say rather than True.

Necessary assumption

An unstated premise the argument requires. Test it by negation: if denying the option destroys the conclusion, the option is the assumption the author must hold.

Scope qualifier

A phrase limiting a claim to a group, time, or setting, such as in this sample. Statements that drop the qualifier usually become Cannot Say.

Weaken versus strengthen

The option must affect the link between evidence and conclusion. Facts about unrelated groups, other periods, or side issues do not change the argument's strength.

Main point option

The choice that captures the passage's overall claim. True-but-narrow options describing one supporting detail are traps, not the main point.

Percentage change formula

(New value minus old value) divided by old value, times 100. The old value is always the denominator, so a 20% rise needs a 16.7% fall to return.

Successive percentage changes

Convert each change to a multiplier and multiply them. A 10% rise then a 10% fall gives 1.10 times 0.90, equal to 0.99, a net 1% decrease.

Reverse percentage

To recover the original amount after a known percentage change, divide by the multiplier. After a 15% rise the multiplier is 1.15, so 92 divided by 1.15 equals 80.

Ratio sharing

Add the ratio parts to get the total, then multiply the amount by each part and divide by the total parts. A 2:3 split of 50 gives 20 and 30.

Weighted average

Sum of each value multiplied by its weight, divided by the sum of weights. Group means must be weighted by group size, never averaged directly.

Average speed round trip

For equal distances at speeds a and b, average speed is 2ab divided by (a+b). It is not the arithmetic mean of the two speeds.

Total from mean

Total equals mean multiplied by count. If one new value is added, the new mean is the old total plus the new value, divided by count plus one.

Estimation elimination

Round values to one or two significant figures to remove clearly wrong options. Compute exactly only when two remaining options are close in value.

Compound unit conversion

Chain conversion rates through a common base and confirm each rate's direction. Multiplying when division is required is the most common conversion error.

Rotation step tracking

Note the angle and direction a shape turns each frame. A 90-degree step returns to the original orientation after four frames, a 45-degree step after eight.

Mirror versus rotation

A reflection reverses chirality, swapping left and right features; a rotation preserves it. Track a distinctive notch or mark to tell them apart.

Superposition rule

In combined-figure series, test whether overlapping lines cancel, add, or keep only shared parts. The rule must hold consistently across every consecutive pair.

Element count sequence

Count shapes, lines, dots, or shaded regions per figure. These counts often form an arithmetic sequence or alternate between two values across the series.

Analogy transformation

Identify the single operation turning figure A into B, such as rotate 180 degrees and invert fill, then apply exactly that operation to figure C.

Odd one out property

Find the attribute shared by all but one figure: number of sides, lines of symmetry, open versus closed outline, or curved versus straight edges.

Cube net opposites

On a cube net, faces separated by exactly one intervening face end up opposite each other. Three faces meet at every vertex of the folded cube.

Perimeter position cycling

Elements often advance one position clockwise around a border or shift one cell with wraparound each step. Verify the step size on two consecutive frames.

Lever balance equation

Force times distance from the pivot must match on both sides: F1 times d1 equals F2 times d2. A longer effort arm therefore requires less applied force.

Lever classes

Class 1 has the pivot between load and effort; Class 2 has the load between them; Class 3 has the effort between them and always needs more force than the load.

Pulley mechanical advantage

A fixed pulley only redirects force. Advantage equals the number of rope segments supporting the movable load, so two supporting segments halve the required effort.

Gear ratio and direction

Meshed gears rotate in opposite directions. Ratio equals driven teeth divided by driver teeth; a larger driven gear turns slower but with greater torque.

Inclined plane force

Ideal effort equals load times height divided by ramp length. A longer, gentler ramp reduces force but requires pulling over a greater distance.

Hydraulic pressure rule

Pressure equals force divided by area and is equal throughout a confined fluid. A larger output piston area therefore produces a proportionally larger output force.

Work-sample ranking order

Rank responses from most effective to least, then choose the best. Any option breaking a stated safety rule or policy is ineffective regardless of speed.

Constraint-first reading

Before judging work-sample options, identify stated deadlines, safety rules, and role limits. Options that ignore a stated constraint are usually the lowest-ranked choices.

Torque direction check

Forces on opposite sides of a pivot act in opposing rotational directions. Balance requires equal torques; unequal torques make the beam rotate toward the larger value.