PREVIOUS YEAR SOLVED PAPERS - GATE 2019
26. Which of the following protocol pairs can be used to send and retrieve e-mails (in that order)?
- Option : B
- Explanation : SMTP is push protocol and to send email and POP3 is pull protocol i.e. to retrieve email.
- Option : A
- Explanation : Condition “if” will be satisfy for i = 0, 2, 4, 6, 8 only. So, “fork()” will call for 5 times. Total number of processes created is, = 2number of fork() There is always only one parent process of these processes and remaining will be child processes. Hence number of child process created is, = 2number of fork() - 1 = 25 - 1 = 32 - 1 = 31 So, option (A) is correct
- Option : A
- Explanation : Given, “for” loop will run from i=0 to 4. i = 0 sum = 0+ 10 – 10 = 0 i = 1 sum = 0 + 9 – 8 = 1 i = 2 sum = 1 + 8 – 6 = 3 i = 3 sum = 3 + 7 – 4 = 6 i = 4 sum = 6 + 6 – 2 = 10 Now, loop terminate and value of sum (i.e., 10) will be printed. So, The output of above C program is 10.
| a | b | d | $ |
| 3 | 2 | 1 | 0 |
Note – Numerical Type question
- Option : A
- Explanation : S → Aa A → BD B → b⏐∈ D → d⏐∈ Follow (B) = {d, a} Hence their index in descending order is 31.
- Option : A
- Explanation : Given an array of 25 distinct elements, and pivot element is chosen uniformly randomly. So, there are only 2 worst case position in the pivot element is either first (or) last. Therefore, required probability is, = 2/25 = 0.08 So, option (A) is correct.
