Classification Questions and Answers

Answer: C

The best description is These are greek letters.

Theta (θ), phi (φ) and omega (ω) are the eighth, twenty-first and twenty-fourth letters of the Greek alphabet; omega is its last letter.

They are not Latin letters. They are widely used as symbols in mathematics and physics (theta for angles, omega for angular velocity or ohms), but that is a use of the letters, not what they are, so 'signs of algebra' and 'used in physical derivatives' describe only some applications and are not the most appropriate description.

Answer: C

The word least like the others is Brass.

Copper, zinc and aluminium are pure metals, chemical elements. Brass is an alloy, a mixture made mainly of copper and zinc. So it differs from the other three in kind.

The trap is that brass is made from two of the other options; that is precisely why it is not like them. Copper, zinc and aluminium share no such difference among themselves.

Answer: D

The odd pair is Dengue : Fever.

In the other three pairs, the second word is the organ that the disease mainly affects: jaundice is a sign of liver disorder, rickets affects the bones, and tuberculosis most commonly attacks the lungs.

In Dengue : Fever, the second word is a symptom (dengue is itself called a fever), not an organ, so the relation is different.

Answer: A

The word that belongs to the group is Adrenal.

Pituitary, thyroid and pancreas are all endocrine glands: they secrete hormones directly into the blood (the pancreas through its islets of Langerhans, which make insulin and glucagon). The adrenal glands, above the kidneys, are endocrine glands too, secreting adrenaline and cortisol.

The heart, liver and kidney are organs, not glands of the endocrine system. The liver is the most tempting distractor because it is a large gland, but it is chiefly an exocrine and metabolic organ, not one of the classic hormone-secreting glands.

Answer: C

The odd one out is Brass.

Copper, tin and platinum are metallic elements. Brass is an alloy, a mixture of copper and zinc.

Grouping by other features does not single out one word: copper and brass are both reddish-yellow, and tin and platinum are both white metals, so the element-versus-alloy distinction is the one that separates exactly one item.

Answer: B

The item that is not named as a major ethical issue is insufficient funding.

The passage names tokenism, a 'one size fits all' approach, and privacy violations when handling demographic data, along with the dilemma of affirmative action versus meritocracy. Funding is not mentioned, so B is the answer.

Answer: B

The odd one out is HJKN.

The other three groups follow the gaps +2, +1, +2 between letters: C(+2)E(+1)F(+2)H, P(+2)R(+1)S(+2)U and U(+2)W(+1)X(+2)Z.

In HJKN the gaps are H(+2)J(+1)K(+3)N: the last step is 3 instead of 2, so it breaks the pattern.

Answer: C

The group that does not belong is PRSU.

In each of the other groups the letters advance by two places every time:

• A C E G: A +2 C +2 E +2 G
• G I K M: G +2 I +2 K +2 M
• M O Q S: M +2 O +2 Q +2 S

In P R S U the steps are +2, +1, +2: R to S is only one place. Following the pattern it should have been P R T V. So PRSU breaks the rule shared by the other three.

Answer: C

The odd group is MQU.

Write each letter's position in the alphabet:

• DGJ: 4, 7, 10 (steps of +3)
• HKN: 8, 11, 14 (steps of +3)
• TWZ: 20, 23, 26 (steps of +3)
• MQU: 13, 17, 21 (steps of +4)

Three groups move forward by three letters each time; only MQU moves by four, so it is different.

Answer: B

The odd pair is 5 : 115.

In each pair the second number is \(n^3 - n\), where \(n\) is the first number:

\[ \begin{aligned} 4^3 - 4 &= 64 - 4 = 60 \\ 6^3 - 6 &= 216 - 6 = 210 \\ 7^3 - 7 &= 343 - 7 = 336 \\ 5^3 - 5 &= 125 - 5 = 120 \end{aligned} \]

The pattern needs 5 : 120, so 5 : 115 is the pair that breaks it.