Mock Test

Exam: RRB NTPC Subject: Reasoning Topic: Coding-Decoding

Total Questions: 20

Q1. In a pattern of word transformations, each word is changed by moving the last letter to the beginning and then reversing the new word. If the initial word is 'COMPUTER', what is the 3rd word in the sequence?

RETUPMOC CRETPUMO ETUPMOCR RETPUMOC
Q2. If 'jot' means 'hot' and 'sun' is 'luv'. What is 'hot sun'?

luv jot jot luv jot luv
Q3. In a 'Coding by Picture Representation' where shapes are encoded based on their geometric properties (number of sides, enclosed area, symmetry), a pentagon with rotational symmetry of order 3 and an even number of vertices is represented by which of the following codes?

P3E P1E P3O P1O
Q4. If a problem involves frequently adding or removing elements from the beginning of a sequence, which data structure might be efficient?

Array Stack Doubly Linked List Hash Map
Q5. In a certain code, 'COMPUTER' is coded as 'DPNQVUFS'. What is the code for 'KEYBOARD'?

LFZSCPSE LFZSCPSD LFZSCPSE LFZSCPSF
Q6. If 'COMPUTERIZATION' is coded as 'DPNQVUFSJABUJPO', what is the code for 'COMMUNICATION'?

DPNNVOJDBUJPO DPNNVOJDBUJPO DPNNVOJDBUJPO DPNNVOJDBUJPO
Q7. Consider a pattern where the first letter of a word is coded by its reverse alphabetical position (A=26, B=25), and subsequent letters are coded by their standard alphabetical position. If 'CAT' is coded as '24120', what would 'DOG' be coded as?

23157 23158 24157 23167
Q8. In a code, 'FORWARD' is coded as 'GPSEBE'. What will be the code for 'BACKWARD'?

DCDLFCE DCDLFE DCBLECE DCDLFE
Q9. If 'CONTROL' is coded as 'LORTNOC', the coding is:

Based on prime number positions. A mirror image of the word. The word written in reverse. A fixed letter shift.
Q10. If 'CAT' is coded as 'ECV', what is the pattern?

Add 2 to the first letter, add 3 to the second, add 4 to the third. Add 2 to each letter. Add 1 to each letter. Add 3 to each letter.
Q11. What is the result of 11 * 0?

0 1 11 110
Q12. A set of digits is arranged in a specific order. The next arrangement is obtained by rotating the digits two positions to the left. If the starting arrangement is 54321, what will be the arrangement after 3 rotations?

15432 21543 32154 43215
Q13. The pie chart shows the percentage of revenue generated from different product categories. If the total revenue was Rs. 1,20,000, how much revenue was generated from category 'Electronics'?

Rs. 24,000 Rs. 30,000 Rs. 36,000 Rs. 48,000
Q14. A pattern involves alternating between two types of operations. If the sequence starts with 3, and the pattern is: add 4, then multiply by 2, then add 4, then multiply by 2, etc. What is the 7th term?

31 35 39 43
Q15. A weather forecasting system determines the 'Alert Level'. If wind speed is > 60 km/h and rainfall is > 50 mm, alert is 'Severe'. If wind speed is > 60 km/h or rainfall is > 50 mm, alert is 'Moderate'. Otherwise, if temperature is < 0°C, alert is 'Cold'. Otherwise, alert is 'Normal'. Which code correctly implements this?

if wind_speed > 60 and rainfall > 50: alert = 'Severe' elif wind_speed > 60 or rainfall > 50: alert = 'Moderate' elif temperature < 0: alert = 'Cold' else: alert = 'Normal' if wind_speed > 60 or rainfall > 50: if wind_speed > 60 and rainfall > 50: alert = 'Severe' else: alert = 'Moderate' elif temperature < 0: alert = 'Cold' else: alert = 'Normal' if temperature < 0: alert = 'Cold' elif wind_speed > 60 or rainfall > 50: alert = 'Moderate' if wind_speed > 60 and rainfall > 50: alert = 'Severe' else: alert = 'Normal' if wind_speed > 60 and rainfall > 50: alert = 'Severe' if wind_speed > 60 or rainfall > 50: alert = 'Moderate' if temperature < 0: alert = 'Cold' else: alert = 'Normal'
Q16. When implementing 'Coding by Exceptions', what potential pitfall can arise from over-reliance on default values for common attributes?

Increased memory consumption due to redundant default data. Difficulty in debugging as the actual, specific values might be obscured. Performance bottlenecks caused by constant retrieval of default settings. Reduced flexibility in handling novel or unforeseen data variations.
Q17. If 'CYCLE' is coded as 02 24 01 02 24, what is the code for 'YCLEC'?

24 01 02 24 02 02 24 02 24 01 24 02 24 01 02 01 02 24 02 24
Q18. What is the missing number in the sequence: 7, 14, 21, 28, ?. It's a simple arithmetic progression.

30 33 35 42
Q19. Observe the pattern: A1B, C2D, E3F, G4H, ?, K8L. What logically follows?

I5J I6J J7I J8K
Q20. If 'PLANET' is coded as 'QOBMFU' and 'EARTH' is coded as 'FBSTU', what is the code for 'MARS'?

NBST NBSU NBCU MBSU

Seamless prep with the tools you already use.

Study across devices, save bookmarks, get smart reminders, and track progress—so your mock tests and AI plans stay in sync.

Start free Browse exams

Elevate your prep today

Streamline practice, track weak topics, and improve faster with AI-guided revision. Try Meltwish free.

Create Free Account