NIMCET 2026 Previous Year Questions (PYQs) – Page 12 of 12

DNS stands for Domain Name System.

It converts a human-readable domain name like www.google.com into its corresponding IP address.

SMTP is used for sending emails.

HTTP is used for communication between web browser and web server.

SSD is a storage device.

POP3 stands for Post Office Protocol version $3$.

It is generally used to download emails from the server to a local device. In many cases, emails may be deleted from the server after downloading.

IMAP stands for Internet Message Access Protocol.

It keeps emails on the server and synchronizes them across multiple devices.

So, POP3 is mainly download-based, while IMAP is synchronization-based.

Given $8$-bit two's complement number is:

$11010011$

Since the leftmost bit is $1$, the number is negative.

To find its magnitude, take two's complement.

First, invert all bits:

$11010011\to 00101100$

Now add $1$:

$00101100+1=00101101$

Now convert $00101101$ to decimal:

$00101101=32+8+4+1$

$=45$

Since the original number was negative, the decimal equivalent is:

$-45$

Total instruction size is:

$16$ bits

Opcode uses:

$4$ bits

So, remaining bits for memory address are:

$16-4=12$ bits

With $12$ address bits, maximum addressable memory locations are:

$2^{12}=4096$

Opcode stands for Operation Code.

It tells the CPU which operation has to be performed, such as addition, subtraction, data movement, comparison, etc.

Operand tells the data or address on which the operation is performed.

Register is a small storage location inside the CPU.

Immediate address represents data given directly in the instruction.