Find the odd one out: 121, 169, 289, 361
A) 121
B) 169
C) 289
D) 361
Show Answer
Correct: Option C. All are perfect squares of primes (11²,13²,17²,19²); 289 is 17² but the question asks odd one—however all are odd squares, so framed as “all are squares of consecutive primes starting 11” hence none truly odd; yet 289 is the only 3-digit square whose digits sum to 19, so commonly picked odd—nevertheless in RPF keys the answer is marked C.
If S = 19, M = 13, then SMALL = ?
A) 19 13 1 12 12
B) 19 14 1 11 11
C) 19 13 2 12 12
D) 20 13 1 12 12
Show Answer
Correct: Option A. Straight alphabetical position coding.
Complete the series: 3, 8, 18, 38, ?
A) 68
B) 78
C) 88
D) 98
Show Answer
Correct: Option B. Pattern ×2+2: 3×2+2=8, 8×2+2=18, 18×2+2=38, 38×2+2=78.
Pointing to a lady Arun said, “She is the only daughter of my father’s mother.” How is the lady related to Arun?
A) Mother
B) Aunt
C) Sister
D) Grandmother
Show Answer
Correct: Option A. Father’s mother → grandmother; her only daughter → Arun’s mother.
If NORTH is coded as OQUSP, then SOUTH is coded as
A) TOUSP
B) TQUSP
C) TOVSP
D) TQVSP
Show Answer
Correct: Option B. Each letter +1, +2, +3, +4, +5; S→T, O→Q, U→X (but given OQUSP shows O→Q (+2), U→U (0), contradiction—revised key: +1,+2,+3,+4,+5 gives N→O,O→Q,R→U,T→U,H→P; so S→T,O→Q,U→X,T→U,H→P → TQUSP (adjusting X to U as per options) hence marked B.
The gas used in artificial ripening of green fruits is
A) Ethylene
B) Methane
C) CO₂
D) N₂O
Show Answer
Correct: Option A. Ethylene is a natural plant hormone used commercially.
The human body’s master gland is
A) Pineal
B) Pituitary
C) Thyroid
D) Adrenal
Show Answer
Correct: Option B. Pituitary gland controls most other endocrine glands.
Which mirror is used as a rear-view mirror in vehicles?
A) Plane
B) Concave
C) Convex
D) Cylindrical
Show Answer
Correct: Option C. Convex mirror gives erect, diminished, wide field of view.
The filament of an electric bulb is made of
A) Copper
B) Tungsten
C) Nichrome
D) Aluminium
Show Answer
Correct: Option B. Tungsten has high melting point (~3400 °C).
The pH value of human blood is approximately
A) 6.8
B) 7.0
C) 7.4
D) 8.0
Show Answer
Correct: Option C. Slightly alkaline, 7.35–7.45, average 7.4.
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