CBSE Class 10 Computer Applications
Question 14 of 79
Internet Services — Question 1
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Question Question 1
Parul has been given a table which contains a list of e-mail addresses. She has been asked to find all the valid e-mail addresses in the list and put a tick mark in front of them. Help her in finishing the given assignment.
aditi_gupta@rediffmail.com
tanmay(45)@webmail.ac.in
www.jay-singh.com
rini@86india@yahoo.com
harsh.kumar@yahoo.co.in
The common rules for a valid email address are as follows:
- Format: An email address must have a specific format:
username@domain.com. The "@" symbol separates the username (before the "@" symbol) and the domain (after the "@" symbol). - Username Rules:
- Must contain only letters (a-z), numbers (0-9), dots (.), hyphens (-), and underscores (_).
- Cannot start or end with a dot.
- Cannot have consecutive dots, hyphens, or underscores (e.g., "..", "--", "__").
- Usernames are not case-sensitive.
- Domain Rules:
- Must contain at least one period (.), typically separating the domain name from the domain extension.
- The domain name can contain letters, numbers, hyphens, and dots. It cannot start or end with a hyphen or dot.
Hence, the valid email addresses are:
| Validity | |
|---|---|
| aditi_gupta@rediffmail.com | ✓ (Valid) |
| tanmay(45)@webmail.ac.in | Invalid as parenthesis not allowed in username. |
| www.jay-singh.com | Invalid as not in username@domain.com format. |
| rini@86india@yahoo.com | Invalid as not in username@domain.com format due to two @ symbols. |
| harsh.kumar@yahoo.co.in | ✓ (Valid) |