Mental Ability MCQ — 2427 Practice Questions with Answers

Explanation

There are 3 interior cevians from the apex, so the base is split into 4 parts and there are 5 rays from the apex including the two sides. Without the midline, the number of triangles is C(5, 2) = 10. The midline doubles this construction, so total triangles = 10 × 2 = 20. The correct count is 20. The usual trap is to count only the larger apex triangles and miss the equal set formed with the midline.

Explanation

A water image is a reflection in a horizontal line, so the top and bottom parts interchange while the left and right sides stay in the same order. Therefore the correct option is the one tagged as the horizontal mirror of the given emblem. The hard part is resisting the vertical mirror: water image flips top-bottom, not left-right. A 180-degree rotation also changes left-right order and is not the same transform.

Explanation

First reverse "LEMON" to get "NOMEL". Now shift from left to right by 1, 2, 3, 4 and 5 places: N→P, O→Q, M→P, E→I, L→Q. Therefore the code is "PQPIQ". "PQPIQ" is obtained only when the reversal is done before the progressive shifts. "MGPSS" is the trap for applying the shifts to the original word without reversing it.

Explanation

The mark turns by 120 degrees at every step. After 2 shown frames, the next position is 120 × 2 = 240 degrees from the starting position. The correct option is the one drawn at 240 degrees. The pattern is a fixed rotation of 120 degrees. The trap is to treat it as a 90-degree turn and choose the next quarter-turn figure.

Explanation

For one person whose ranks from both ends are known, total customers = left rank + right rank - 1. Here, total = 9 + 14 - 1 = 22. The subtraction of 1 is needed because Ritu is counted in both ranks. The correct count is 22. The common trap is adding 9 and 14 directly and counting Ritu twice.