Docker MCQs with answers Page - 4

Dear candidates you will find MCQ questions of Docker here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
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📊 Docker
Q. Which command is used to push an image to Docker Hub?
  • (A) docker push
  • (B) docker upload
  • (C) docker send
  • (D) docker publish
💬 Discuss
✅ Correct Answer: (A) docker push

Explanation: The 'docker push' command uploads an image to Docker Hub.

📊 Docker
Q. What is the purpose of the ARG instruction in a Dockerfile?
  • (A) To define build-time variables
  • (B) To set environment variables
  • (C) To specify the working directory
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To define build-time variables

Explanation: The ARG instruction defines build-time variables that can be passed during the image build process.

📊 Docker
Q. Which command is used to rename a Docker container?
  • (A) docker rename
  • (B) docker mv
  • (C) docker update
  • (D) docker modify
💬 Discuss
✅ Correct Answer: (A) docker rename

Explanation: The 'docker rename' command renames a container.

📊 Docker
Q. What is the purpose of the HEALTHCHECK instruction in a Dockerfile?
  • (A) To check the health of the container
  • (B) To define the base image
  • (C) To specify the working directory
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To check the health of the container

Explanation: The HEALTHCHECK instruction defines a command to check the health of the container.

📊 Docker
Q. Which command is used to pause a running Docker container?
  • (A) docker pause
  • (B) docker stop
  • (C) docker halt
  • (D) docker freeze
💬 Discuss
✅ Correct Answer: (A) docker pause

Explanation: The 'docker pause' command pauses all processes in a running container.

📊 Docker
Q. What is the purpose of the LABEL instruction in a Dockerfile?
  • (A) To add metadata to the image
  • (B) To define the base image
  • (C) To specify the working directory
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To add metadata to the image

Explanation: The LABEL instruction adds metadata (key-value pairs) to the Docker image.

📊 Docker
Q. Which command is used to unpause a paused Docker container?
  • (A) docker unpause
  • (B) docker resume
  • (C) docker start
  • (D) docker continue
💬 Discuss
✅ Correct Answer: (A) docker unpause

Explanation: The 'docker unpause' command resumes a paused container.

📊 Docker
Q. What is the purpose of the ONBUILD instruction in a Dockerfile?
  • (A) To trigger instructions when the image is used as a base for another image
  • (B) To define the base image
  • (C) To specify the working directory
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To trigger instructions when the image is used as a base for another image

Explanation: The ONBUILD instruction triggers commands when the image is used as a base for another image.

📊 Docker
Q. Which command is used to view the history of a Docker image?
  • (A) docker history
  • (B) docker inspect
  • (C) docker logs
  • (D) docker info
💬 Discuss
✅ Correct Answer: (A) docker history

Explanation: The 'docker history' command shows the history of an image, including its layers.

📊 Docker
Q. What is the purpose of the STOPSIGNAL instruction in a Dockerfile?
  • (A) To specify the signal to stop the container
  • (B) To define the base image
  • (C) To specify the working directory
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To specify the signal to stop the container

Explanation: The STOPSIGNAL instruction sets the system call signal to stop the container.

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