Docker MCQs with answers Page - 3

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 pull an image from Docker Hub?
  • (A) docker pull
  • (B) docker fetch
  • (C) docker download
  • (D) docker get
💬 Discuss
✅ Correct Answer: (A) docker pull

Explanation: The 'docker pull' command downloads an image from Docker Hub.

📊 Docker
Q. What is the purpose of the VOLUME instruction in a Dockerfile?
  • (A) To create a persistent data volume
  • (B) To mount a host directory into the container
  • (C) To define a network volume
  • (D) To specify a shared volume between containers
💬 Discuss
✅ Correct Answer: (A) To create a persistent data volume

Explanation: The VOLUME instruction creates a persistent data volume in the container.

📊 Docker
Q. Which command is used to list all Docker images on the local machine?
  • (A) docker images
  • (B) docker list
  • (C) docker ps
  • (D) docker ls
💬 Discuss
✅ Correct Answer: (A) docker images

Explanation: The 'docker images' command lists all Docker images stored locally.

📊 Docker
Q. What is the purpose of the WORKDIR instruction in a Dockerfile?
  • (A) To set the working directory for subsequent instructions
  • (B) To define the user for running commands
  • (C) To specify the base image
  • (D) To copy files into the container
💬 Discuss
✅ Correct Answer: (A) To set the working directory for subsequent instructions

Explanation: The WORKDIR instruction sets the working directory for subsequent instructions in the Dockerfile.

📊 Docker
Q. Which command is used to remove a Docker image?
  • (A) docker rmi
  • (B) docker remove
  • (C) docker delete
  • (D) docker erase
💬 Discuss
✅ Correct Answer: (A) docker rmi

Explanation: The 'docker rmi' command removes one or more Docker images.

📊 Docker
Q. What is the purpose of the COPY instruction in a Dockerfile?
  • (A) To copy files from the host to the container
  • (B) To copy files between containers
  • (C) To copy files from the container to the host
  • (D) To create a backup of the container
💬 Discuss
✅ Correct Answer: (A) To copy files from the host to the container

Explanation: The COPY instruction copies files or directories from the host machine into the Docker image.

📊 Docker
Q. Which command is used to start a stopped Docker container?
  • (A) docker start
  • (B) docker run
  • (C) docker create
  • (D) docker launch
💬 Discuss
✅ Correct Answer: (A) docker start

Explanation: The 'docker start' command starts a stopped container.

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

Explanation: The ENV instruction sets environment variables inside the container.

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

Explanation: The 'docker inspect' command provides detailed information about a container.

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

Explanation: The USER instruction specifies the user or UID for running commands in the container.

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