Which compiler phase converts source code into tokens?
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Correct answer: (C) Lexical analysis
Explanation
The lexer produces tokens; the parser builds a parse tree.
DSSSB TGT / PGT · Computer Science
Theory of Computation & Compilers Previous Year Questions
10 Theory of Computation & Compilers (Computer Science) questions asked in DSSSB TGT / PGT previous year papers, each with the correct answer and explanation. Read them free on UTpaper, or attempt the full papers as timed online tests.
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Other Computer Science topics
DBMS & SQL 278Computer Networks 233Digital Logic & Number Systems 227Operating Systems 189Data Structures 184Programming in C/C++ 133Computer Organization & Architecture 88Web Technologies 88Algorithms 84OOP 74Java 69Discrete Mathematics 68E-Commerce & IT Management 41Python 39Software Engineering 38Computer Graphics & Multimedia 35Computer Fundamentals & MS Office 34Cyber Security 16AI, ML & Data Science 15
Beta testing is performed by:
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Correct answer: (B) Real users at the customer's site
Explanation
Alpha testing is done at the developer's site.
Which translator executes a program line by line?
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Correct answer: (C) Interpreter
Explanation
An interpreter translates and executes one statement at a time.
Which translator converts the entire high-level program into machine code at once before execution?
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Correct answer: (B) Compiler
Explanation
A compiler translates the whole program; an interpreter works line by line.
The ______ houses the switches in token ring.
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Correct answer: (C) MAU
Explanation
In Token Ring, the MAU (Multistation Access Unit) is the hub-like device that houses the switches and connects the stations into a logical ring.
Which translator is used to convert assembly language to machine language?
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Correct answer: (A) Assembler
Explanation
An assembler translates assembly-language mnemonics into machine code. Compilers and interpreters translate high-level languages, and a linker joins object files.
________ is a system software package that converts a high language program to machine language.
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Correct answer: (A) Compiler
Explanation
A compiler is system software that translates a high-level language program into machine language (object code) as a whole.
Which of the following actions demonstrates good netiquette in an online forum?
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Correct answer: (B) Using proper grammar and punctuation
Explanation
Netiquette means polite online behaviour: proper grammar and punctuation, respectful replies, relevant posts and privacy for others. Insults, spam and sharing others' personal data violate it.
What is the core principle of the multilingual approach in early education?
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Correct answer: (C) Welcoming the child’s language and using it to build understanding
Explanation
The multilingual approach treats the child's home language as a resource: teachers welcome it and use it as a bridge to new concepts and to other languages, as NEP 2020 and NCF advise.
What is C tokens?
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Correct answer: (D) The smallest individual units of C program and the basic element recognised by the compiler both
Explanation
Tokens such as keywords, identifiers, constants, strings, operators and punctuators are the smallest individual units of a C program and the basic elements the compiler recognises.
How to use these DSSSB TGT / PGT Computer Science questions
Every question here was asked in a real DSSSB TGT / PGT paper; the paper and shift are shown on the card, and the number opens the question on its own page. Try each one before tapping Show answer, then attempt the full DSSSB TGT / PGT papers as timed tests to check your speed under exam conditions.