Dockerfile MCQs with answers Page - 1

You will find multiple-choice questions (MCQs) related to #Dockerfile here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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A

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Q. Which Dockerfile instruction is used to specify the base image?

  • (A) COPY
  • (B) CMD
  • (C) FROM
  • (D) RUN

A

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Q. What does the RUN instruction do in a Dockerfile?

  • (A) Starts the container
  • (B) Executes a command while building the image
  • (C) Sets default command for container
  • (D) Exposes a port

A

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Q. Which Dockerfile instruction sets the working directory inside the container?

  • (A) CMD
  • (B) WORKDIR
  • (C) VOLUME
  • (D) ENTRYPOINT

A

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Q. Which instruction is used to copy files from the host to the image?

  • (A) RUN
  • (B) COPY
  • (C) CMD
  • (D) EXPOSE

A

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Q. What does the CMD instruction do?

  • (A) Build the image
  • (B) Defines default command to run when container starts
  • (C) Mount a volume
  • (D) Update system packages

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Q. Which instruction in Dockerfile is best for setting environment variables?

  • (A) ARG
  • (B) ENV
  • (C) SET
  • (D) CMD

A

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Q. What is the use of the EXPOSE instruction in a Dockerfile?

  • (A) To run a service
  • (B) To open a port on the host
  • (C) To document which port the container listens on
  • (D) To expose a volume

A

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Q. Which instruction is used to include metadata labels in a Dockerfile?

  • (A) LABEL
  • (B) TAG
  • (C) INFO
  • (D) ENV

A

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Q. What is the difference between CMD and ENTRYPOINT?

  • (A) ENTRYPOINT is used during build only
  • (B) CMD cannot be overridden
  • (C) CMD sets default arguments, ENTRYPOINT sets fixed command
  • (D) They are the same

A

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Q. Which instruction allows the Dockerfile to accept variables at build time?

  • (A) ENV
  • (B) ARG
  • (C) CMD
  • (D) COPY

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