Coding and Decoding questions and answers

20 questions in 2 online tests, each with its answer and a worked solution.

Start Test 1

Coding and Decoding: key points

In coding and decoding a word is changed into a code by a fixed rule; you must find the rule and apply it to another word.

  • Compare the word and its code letter by letter to find the shift.
  • Check for a reversed word before looking for anything harder.
  • Number codes usually use alphabet positions, either added together or written side by side.
  • In opposite-letter coding, a letter at position n becomes the letter at position 27 − n.

How to practise Coding and Decoding

Start with the key points, then take one Coding and Decoding test without rushing. Review every explanation, note the steps you missed and repeat the topic against the clock. APTITUDE TESTER has 20 questions in 2 tests for this topic.

  • Read the method before attempting a timed test.
  • Record mistakes by type: concept, calculation or time management.
  • Return to the hardest questions after a day and try them again.

Continue with another Reasoning topic when your accuracy is steady.

Coding and Decoding online tests

Sample Coding and Decoding questions

  1. 1. In a certain code, MOTHER is written as NPUIFS. How is BRAIN written in that code?
    1. CSBOJ
    2. CSBJO
    3. AQZHM
    4. DTCKP

    Reference: q-d2574c56-83 · Report this question

    Show answer and solution

    Answer: B. CSBJO

    Each letter is moved 1 place forward in the alphabet, so BRAIN becomes CSBJO.
  2. 2. If SCHOOL is coded as LOOHCS, how is SILVER coded?
    1. RILVES
    2. RVELIS
    3. ERVLIS
    4. REVLIS

    Reference: q-e14b5636-51 · Report this question

    Show answer and solution

    Answer: D. REVLIS

    The letters of the word are written in reverse order, so SILVER becomes REVLIS.
  3. 3. If A = 1, B = 2, C = 3 and so on up to Z = 26, what is the sum of the values of the letters in the word 'GOLD'?
    1. 35
    2. 40
    3. 38
    4. 39

    Reference: q-f3d53098-112 · Report this question

    Show answer and solution

    Answer: C. 38

    G = 7, O = 15, L = 12, D = 4. Sum = 38.

See all the questions of Test 1

Coding and Decoding: questions people ask

How many Coding and Decoding questions are there?

There are 20 Coding and Decoding questions in 2 tests. Each test has its own page that lists the questions with their answers and solutions.

How long does a Coding and Decoding test take?

A test of 10 questions has a time limit of 15 minutes, which is 90 seconds a question.

Is there negative marking?

Rules vary by set. The rules screen shows the time limit, marks, any wrong-answer penalty and calculator permission before you begin. Feedback mode has no time limit or negative marking.

Can I practise Coding and Decoding without a time limit?

Yes. Choose practice mode: there is no clock, and the answer and solution appear as soon as you select an option.