MCQ
Reasoning: Mirror & Water Images MCQ - Practice Questions with Answers
Solve 25 Reasoning: Mirror & Water Images questions for RAS/RPSC preparation.
Practice questions
Q1Read the assertion and reason, then choose the correct answer. Assertion: The water image of ↑ ↓ ↑ is ↓ ↑ ↓. Reason: In a water image, up and down directions interchange, but the left-to-right order remains the same.
In a water image, reflection is across a horizontal line. So every upward arrow becomes a downward arrow, and every downward arrow becomes an upward arrow. The order from left to right is not reversed. Applying this to ↑ ↓ ↑ gives ↓ for the first symbol, ↑ for the second symbol, and ↓ for the third symbol. Thus the water image is ↓ ↑ ↓. The stated reason is exactly the rule used to get this result, so it explains the assertion.
Q2Four cards numbered 1, 2, 3 and 4 are placed in a row from left to right. A plane mirror is placed just to the right of card 4. Which statement about the mirror image is correct?
The mirror is placed on the right side of the row, next to card 4. In a plane mirror, the object nearest to the mirror appears nearest in the image. Therefore card 4 will be closest to the mirror image side. Moving outward from the mirror, the next original cards are 3, then 2, then 1. So the image order from the mirror outward is 4, 3, 2, 1. The original left end does not remain the nearest point.
Q3Read the assertion and reason. Assertion: If the top row is H4 and the bottom row is S7, then in the water image the top row will still be H4. Reason: A water image interchanges the top and bottom positions while keeping the left-to-right order of each row unchanged. Choose the correct option.
In a water image, the reflection is across a horizontal line. Therefore, the top and bottom positions are interchanged. The original top row is H4 and the original bottom row is S7. In the water image, S7 will come to the top and H4 will go to the bottom. The left-to-right order inside each row remains H4 and S7 respectively; it does not become 4H or 7S. So the assertion is false, while the reason states the correct rule. Hence option B is correct.
Q4A card has two rows: top row A B C and bottom row D E F. For its water image, which statement is incorrect? 1. The top row in the water image is D E F. 2. The bottom row in the water image is A B C. 3. The top row in the water image is F E D.
A water image changes the top-bottom position of the rows, not the left-right order inside each row. The original bottom row D E F moves to the top, so statement 1 is correct. The original top row A B C moves to the bottom, so statement 2 is also correct. Statement 3 says the top row becomes F E D, but that reverses left and right as well. Hence the only incorrect statement is statement 3.
Q5A clock shows 3:40. If its image is seen in a plane mirror placed in front of it, what time will appear in the mirror?
For the mirror image of an analogue clock, subtract the shown time from 11:60. The actual time is 3:40, so calculate 11:60 - 3:40. Minutes: 60 - 40 = 20. Hours: 11 - 3 = 8. Therefore the time seen in the mirror is 8:20. This also matches the visual idea that the hands are reflected left to right, so the shown time and its mirror time together complete 12 hours.
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More questions
6The sequence ↑ → ↓ ← is written on a paper. If its water image is formed, which sequence will be seen?
7For this question, write only the order of the symbols, not their drawn shapes. The code P7Q4R is placed in front of a vertical mirror on its right side. Which order will be read in the mirror?
8Match each original arrangement with the correct reflected order. Arrangement 1: right-side mirror of the row drum, kite, lock. Arrangement 2: water image of the vertical stack sun, leaf, bell from top to bottom. Arrangement 3: left-side mirror of the row flag, book, lamp. Results: 1 = lamp, book, flag; 2 = lock, kite, drum; 3 = bell, leaf, sun.
9The mirror image of an analogue clock shows 8:20. What is the actual time shown by the clock?
10A digital display shows 12:35. If its water image is seen below the display, what will the image read? Use the usual seven-segment digital form.
11Match each original code with its correct vertical mirror order. I. A 3 B, II. 5 P Q, III. R 8 T. Answers: 1. T 8 R, 2. B 3 A, 3. Q P 5.
12Read the assertion and the reason. Only the order of the printed tokens is to be considered. Assertion: If a vertical stack reads N, 5, T from top to bottom, its water image reads T, 5, N from top to bottom. Reason: In a water image, the top and bottom positions interchange, while a middle token remains between them.
13Five tiles are placed in one row from left to right as follows: star, crescent, square, triangle, circle. A plane mirror is kept on the right side of the row. If only the order of the tiles is to be judged, which sequence will be seen in the mirror?
14The row P Q R S T is written from left to right. Which one of the following statements is incorrect?
15A vertical plane mirror is kept on the right side of the word MATH. In the mirror image, in which order will the letters be read from left to right? Assume all letters are written in simple block capitals.