Information Technology questions and answers

10 questions in 1 online test, each with its answer and a worked solution.

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Information Technology: key points

Information technology questions for IT officer posts cover databases, networking, data structures and programming concepts.

  • The OSI model has seven layers: Physical, Data Link, Network, Transport, Session, Presentation and Application.
  • SQL: CREATE, ALTER and DROP are DDL; INSERT, UPDATE and DELETE are DML.
  • A stack is last in, first out; a queue is first in, first out.
  • Ports: HTTP 80, HTTPS 443, FTP 21, SMTP 25. An IPv4 address has 32 bits and an IPv6 address 128.

How to practise Information Technology

Start with the key points, then take one Information Technology test without rushing. Review every explanation, note the steps you missed and repeat the topic against the clock. APTITUDE TESTER has 10 questions in 1 test 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 Professional Knowledge topic when your accuracy is steady.

Information Technology online tests

Sample Information Technology questions

  1. 1. How many layers are there in the OSI reference model?
    1. 7
    2. 5
    3. 4
    4. 6

    Reference: q-1b450e22-54 · Report this question

    Show answer and solution

    Answer: A. 7

    The OSI model has seven layers, from Physical to Application.
  2. 2. Which of the following is NOT a DML command in SQL?
    1. CREATE
    2. UPDATE
    3. INSERT
    4. DELETE

    Reference: q-cd68f9c5-52 · Report this question

    Show answer and solution

    Answer: A. CREATE

    CREATE is a DDL command; the others change data and are DML commands.
  3. 3. The key chosen to uniquely identify each record in a table is called the
    1. Alternate key
    2. Secondary key
    3. Primary key
    4. Foreign key

    Reference: q-5c0efc7a-73 · Report this question

    Show answer and solution

    Answer: C. Primary key

    The primary key uniquely identifies each row of a table.

See all the questions of Test 1

Information Technology: questions people ask

How many Information Technology questions are there?

There are 10 Information Technology questions in 1 test. Each test has its own page that lists the questions with their answers and solutions.

How long does a Information Technology 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 Information Technology 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.