Mirror Water Image

Key Concepts & Formulas

10 Practice MCQs

Q1. What is the mirror image of “RAILWAY”? A) YAWLIAR B) YA⅃IΛЯ C) ЯAI⅃WAY D) YAWLIAЯ

Answer: B) YA⅃IΛЯ

Solution:

• R → Я (backward R)
• A → Λ (inverted V shape)
• I → I (symmetrical)
• L → ⅃ (backward L)
• W → W (symmetrical)
• A → Λ (inverted V shape)
• Y → Y (symmetrical)

Shortcut: Write on paper, hold to mirror - read reflected image

Concept: Mirror Image - Letter transformation rules

Q2. Find the water image of “STATION”? A) NOITA⊥S B) NOITATS C) S⊥ATION D) NOITΛ⊥S

Answer: A) NOITA⊥S

Solution:

• Write vertically and flip upside down
• S → S (remains same)
• T → ⊥ (inverted T)
• A → Λ (inverted A)
• T → ⊥ (inverted T)
• I → I (remains same)
• O → O (remains same)
• N → N (remains same)

Shortcut: Turn paper upside down, read from bottom to top

Concept: Water Image - Vertical inversion principle

Q3. Which number looks same in mirror image? A) 2 B) 3 C) 0 D) 5

Answer: C) 0

Solution:

• 2 → backward 2 (different)
• 3 → backward 3 (different)
• 0 → 0 (symmetrical, same)
• 5 → backward 5 (different)

Shortcut: Numbers 0, 1, 8 have mirror symmetry

Concept: Mirror Image - Number symmetry rules

Q4. A train board shows “EXPRESS 123”. What appears in the water reflection of a puddle? A) 321 SSƎɹԳPXƎ B) 321 SƧƎɹԳPXƎ C) ƎXPԳƎɹƧƧ 321 D) 321 SSƎɹԳPXƎ

Answer: A) 321 SSƎɹԳPXƎ

Solution:

• Reverse entire string: “321 SSƎɹԳPXƎ”
• E → Ǝ
• R → ɹ
• P → Գ
• Numbers 1,2,3 flip vertically but remain recognizable

Shortcut: Reverse string order + flip each character vertically

Concept: Combined water image with alphanumeric

Q5. If a station clock shows 3:00, what time appears in its mirror? A) 9:00 B) 12:00 C) 9:30 D) 3:00

Answer: A) 9:00

Solution:

• Mirror time = 12:00 - actual time
• 12:00 - 3:00 = 9:00
• Check: 3 and 9 are opposite on clock face

Shortcut: Mirror time = (12:00 - given time) OR (24:00 - given time)

Concept: Mirror Image - Clock dial symmetry

Q6. A ticket shows seat number “B3”. What appears in the mirror at the ticket counter? A) ƎƸ B) ƸƎ C) 3B D) ɘƨ

Answer: B) ƸƎ

Solution:

• Reverse order: 3B
• B → ɘ (backward B)
• 3 → ƨ (backward 3)
• Result: ƨɘ but written as ƸƎ in options

Shortcut: Reverse string + flip each character horizontally

Concept: Mirror Image - Alphanumeric combinations

Q7. The word “RAILWAY” is written on a train. A person in a helicopter sees its water reflection in a river. What appears? A) YAWLIAR B) YΛW⅃IΛЯ C) ЯAI⅃WAY D) YΛWIΛЯ

Answer: B) YΛW⅃IΛЯ

Solution:

• First apply mirror: ЯAI⅃WAY
• Then apply water: YΛW⅃IΛЯ (reverse order + vertical flip)
• Y → Y (same upside down)
• A → Λ (inverted)
• W → W (same)

Shortcut: Mirror first, then water transformation

Concept: Combined mirror + water image

Q8. A platform display shows “TRAIN ★ 180”. In the mirror reflection, what symbol sequence appears? A) 081 ★ NIART B) 081 ★ ЯAIИT C) 081 ★ TИIΛЯ D) 081 ★ ЯИIΛЯ

Answer: C) 081 ★ TИIΛЯ

Solution:

• Reverse entire string: “081 ★ TИIΛЯ”
• T → T (symmetrical)
• R → Я
• A → Λ
• I → I
• N → И
• ★ → ★ (symmetrical)
• Numbers 1,8,0 flip appropriately

Shortcut: Star symbol remains same, focus on letter transformations

Concept: Complex string with special characters

Q9. If “DELHI” is written on transparent paper and viewed through water droplets on glass, what appears? A) IHᄅƎD B) IH⅃ƎD C) IHIƎD D) IHᄅED

Answer: B) IH⅃ƎD

Solution:

• Water image = vertical inversion
• Reverse order: IHLED
• D → D (symmetrical vertical)
• E → Ǝ (inverted)
• L → ⅃ (inverted)
• H → H (symmetrical)
• I → I (symmetrical)

Shortcut: Transparent paper + water = water image only

Concept: Water Image - Transparent medium scenario

Q10. A railway sign shows “CAUTION ⚠ 50m”. In the driver’s mirror, what complete sequence appears? A) m05 ⚠ NOITAUC B) m05 ⚠ ИOITΛƆU C) m05 ⚠ ИOITΛUC D) m05 ⚠ ИOITΛ∩Ɔ

Answer: B) m05 ⚠ ИOITAƆU

Solution:

• Reverse string: “m05 ⚠ ИOITΛƆU”
• C → Ɔ (backward C)
• A → Λ (inverted)
• U → ∩ (inverted U)
• T → T (symmetrical)
• I → I
• O → O
• N → И (backward N)
• ⚠ → ⚠ (symmetrical)
• m → m (symmetrical)

Shortcut: Warning symbols usually symmetrical, focus on text

Concept: Mirror Image - Real-world signage application

5 Previous Year Questions

PYQ 1. Find the water image of “RAILWAY” [RRB NTPC 2021 CBT-1]

Answer: YΛW⅃IΛЯ

Solution: Reverse the word and flip each letter vertically: R→Я, A→Λ, I→I, L→⅃, W→W, A→Λ, Y→Y

Exam Tip: Write the word upside down on paper, then read from bottom

PYQ 2. What is the mirror image of “STATION 15”? [RRB Group D 2022]

Answer: S1 NOITA⊥S

Solution: Reverse entire string: “S1 NOITA⊥S” where T→⊥, S→S, 1→1 (backward), 5→Ƨ

Exam Tip: Numbers 2,3,4,5,7 change in mirror; 0,1,8 remain same

PYQ 3. If a clock shows 2:45, what time appears in mirror? [RRB ALP 2018]

Answer: 9:15

Solution: Mirror time = 11:60 - 2:45 = 9:15 (or 12:00 - 2:45 = 9:15, adjust for 12-hr format)

Exam Tip: For mirror clock: Subtract from 12:00 or 24:00

PYQ 4. Find the water image of “ENGINE” [RRB JE 2019]

Answer: ƎИIGИƎ

Solution: E→Ǝ (inverted), N→И (backward), G→G (symmetrical), I→I, N→И, E→Ǝ

Exam Tip: Some letters like G appear same in water image

PYQ 5. A train number “12345” appears in water reflection. What is seen? [RPF SI 2019]

Answer: 54321 with flipped digits

Solution: Reverse order: 54321, then flip each digit vertically: 5→5, 4→4, 3→Ɛ, 2→⅋, 1→1

Exam Tip: In water image, reverse the sequence first, then flip each character

Speed Tricks & Shortcuts

Common Mistakes to Avoid

Quick Revision Flashcards

Topic Connections

• Direct Link: Alphabet Test - Letter recognition and symmetry concepts
• Combined Questions: Often asked with Direction Sense (train directions in reflections)
• Foundation For: Figure Counting - Understanding symmetry helps in complex figure problems
• Exam Strategy: 2-3 questions guaranteed in every RRB exam, easiest 2 marks if concepts clear