UPSC CISF-AC-EXE

In a computer system, the signed numbers cannot be represented by

[amp_mcq option1=”signed magnitude” option2=”one’s complement” option3=”two’s complement” option4=”float magnitude” correct=”option4″]

The correct answer is D) float magnitude. Signed integers in computer systems are typically represented using methods like signed magnitude, one’s complement, or two’s complement. These methods handle the sign (positive or negative) of the integer value. ‘Float magnitude’ is not a standard method for representing signed integers. Floating-point numbers use a different format (usually IEEE 754 standard) involving a sign bit, an exponent, and a mantissa, which is distinct from signed integer representations.

Signed magnitude, one’s complement, and two’s complement are standard methods for representing signed integers in binary. Floating-point representation is used for real numbers and uses a different structure.

Signed magnitude uses the leftmost bit for the sign (0 for positive, 1 for negative) and the remaining bits for the magnitude. One’s complement represents negative numbers by inverting all bits of the positive number. Two’s complement is the most common method for representing signed integers due to its efficiency in arithmetic operations; it represents negative numbers by inverting all bits of the positive number and adding 1.

The smallest addressable unit of memory is

[amp_mcq option1=”bit” option2=”byte” option3=”word” option4=”nibble” correct=”option2″]

In most modern computer architectures, the smallest addressable unit of memory is a byte. Memory addresses are typically assigned to individual bytes, allowing programs to access or modify memory one byte at a time.

– A byte consists of 8 bits.
– While a bit is the fundamental unit of digital information (0 or 1), it is usually not directly addressable in memory. Access is typically at the byte level or larger units like words.

– A nibble is a group of 4 bits, which is half a byte. It’s a useful concept in some contexts but not a standard addressable unit.
– A word is a native unit of data used by a particular processor design. Its size varies (e.g., 16, 32, 64 bits) and is typically aligned on byte boundaries.
– Understanding the smallest addressable unit is fundamental to understanding memory organization and pointers in programming.

Which of the following is/are pointing device/devices?

• 1. Trackball
• 2. Touchscreen

Select the correct answer using the code given below.

[amp_mcq option1=”1 only” option2=”2 only” option3=”Both 1 and 2″ option4=”Neither 1 nor 2″ correct=”option3″]

Both Trackball and Touchscreen are types of pointing devices. A pointing device allows a user to interact with a computer interface by controlling a cursor or pointing to objects on the screen.

– A trackball is an input device used to enter motion data into computers or other electronic devices. It functions like an upside-down mouse; the user rolls a ball to move the cursor.
– A touchscreen is a display screen that can detect the presence and location of a touch within the display area, typically by a finger or stylus.

– Other common pointing devices include the mouse, touchpad, pointing stick, joystick, and graphics tablet.
– Pointing devices are essential for graphical user interfaces (GUIs) as they provide an intuitive way for users to interact with elements displayed on the screen.

In the context of universal character encoding standard, UTF stands for

[amp_mcq option1=”Unicode Transformation Format” option2=”Unicode Transformation Form” option3=”Unique Transformation Format” option4=”Unique Transformation Form” correct=”option1″]

In the context of universal character encoding standard, UTF stands for Unicode Transformation Format. UTF is a mapping between the Unicode code points (numerical representations of characters) and sequences of bytes.

– Unicode is a standard for encoding, representing, and handling text expressed in most of the world’s writing systems.
– UTF encodings like UTF-8, UTF-16, and UTF-32 are variable-length encoding schemes for Unicode.

– UTF-8 is the most common encoding used on the web and for general-purpose text files because it is backward-compatible with ASCII and efficient for commonly used characters.
– UTF-16 uses 16-bit code units and is used by systems like Windows and Java.
– UTF-32 uses a fixed 32-bit code unit for every character.

In HTML, which one of the following is used to open the linked document in a new browser window?

[amp_mcq option1=”_self” option2=”_link” option3=”_blank” option4=”_open” correct=”option3″]

In HTML, the `target` attribute of the `` (anchor) tag specifies where to open the linked document. The value `_blank` is used to open the linked document in a new browser window or tab.

– The `target` attribute determines the browsing context (window, tab, or frame) in which the linked document will be displayed.
– Common values for the `target` attribute include `_self` (default), `_blank`, `_parent`, and `_top`.

– `_self` opens the document in the same window/tab the link was clicked.
– `_parent` opens the document in the parent frame.
– `_top` opens the document in the full body of the window.
– Using `target=”_blank”` should be done judiciously as it can impact user experience, although it is very commonly used for external links.