Computer — All MCQs
4795 questions available
Q3281.DEO is abbreviation of _____?
Correct Answer: B
DEO stands for Data Entry Operator, an administrative specialist who inputs and updates records in computer systems.
Q3282.Which of following is not a valid zoom percentage in Excel?
Correct Answer: D
MS Excel restricts worksheet zoom levels to a minimum of 10% and a maximum of 400%, making 500% an invalid zoom level.
Q3283.Which of the following statements is correct about adding/deleting columns and rows in a database or spreadsheet?
Correct Answer: B
Spreadsheets and databases are designed with flexibility, allowing users to insert, modify, or delete columns and rows freely.
Q3284.Which of the following formulas is NOT correctly entered in Excel?
Correct Answer: D
Excel formulas must always begin with an equal sign (=). Without it, Excel treats 'C1+15' as plain literal text.
Q3285.All of the following are examples of input devices except?
Correct Answer: A
A printer is an output device (producing physical hard copies), whereas mice, scanners, and keyboards are input devices.
Q3286.Shortwave radio transmits in a band of frequencies ranging between _____?
Correct Answer: C
Shortwave radio operates in the high frequency (HF) spectrum, typically utilized between 5.9 MHz and 26.1 MHz for global broadcasts.
Q3287.Fiber optics is a data _____?
Correct Answer: C
Fiber optics is fundamentally a high-speed data communication technology that transmits information as light pulses.
Q3288.Which loop structure is not available in C programming?
Correct Answer: A
C programming supports 'for', 'while', and 'do-while' loops. 'do-until' is not a valid C programming keyword or construct.
Q3289.Conditional operator is an alternative of ______?
Correct Answer: C
The ternary conditional operator (? :) in C-based languages acts as a compact, inline alternative to an if-else block.
Q3290.In statement scanf("%c", & km); km is a(n)?
Correct Answer: B
The '%c' format specifier in C's scanf function instructs the system to read a single character into a character variable (char).
Q3291.Which escape sequence moves the cursor at the beginning of current line?
Correct Answer: A
The '\r' (carriage return) escape sequence shifts the output cursor back to the start of the current active line without moving to a new line.
Q3292.The result of C expression 9/4*2 will be equal to _____?
Correct Answer: A
In C, integer division 9 / 4 evaluates to 2 (truncating decimals). Then, 2 * 2 evaluates to 4.
Q3293.Which data type offers the highest precision?
Correct Answer: B
Among primitive real number types, 'long double' occupies the most memory (typically 80 or 128 bits) providing the highest precision.
Q3294.Which header file contains information about common mathematical functions?
Correct Answer: A
The standard C/C++ header file containing prototypes for mathematical operations (like sqrt, sin, cos) is <math.h>.
Q3295.The keyword _____ is used to specify two different choices with "if" statement.
Correct Answer: B
The 'else' keyword defines the alternative block of code to run when the condition in an 'if' statement evaluates to false.
Q3296.An example of non-numerical data is _____?
Correct Answer: C
An address contains letters, characters, and spaces, making it non-numerical (alphanumeric) data, unlike balances or ID numbers.
Q3297.Interface used in DOS is called _____?
Correct Answer: A
DOS (Disk Operating System) is built on a text-based Command-Line Interface (CLI) where users type commands at a prompt.
Q3298.Which of the following keys is not unique?
Correct Answer: C
A foreign key in a relational database table establishes a link to another table's primary key and can contain duplicate values.
Q3299.Which of the following is NOT a good primary key?
Correct Answer: B
A good primary key must be unique and constant. A zip code is shared by many houses/individuals, making it unsuitable.
Q3300.A virtual table that that is constructed from other tables is called _____?
Correct Answer: C
A view is a dynamic virtual table in SQL constructed from a query over one or more physical database tables.