Olympiad Test: Introduction To Q Basic - 1 - Class 6 MCQ

In QBASIC, description comments are put in the source program with the REM statement.
QBASIC is a programming language that was developed by Microsoft as a simplified version of the BASIC programming language. It is often used for educational purposes and simple programming tasks.
When writing programs in QBASIC, it is important to include comments to make the code more readable and understandable. Comments are lines of text that are ignored by the QBASIC compiler and are used to provide explanations and descriptions of the code.
To add a comment in QBASIC, you can use the REM statement, which stands for "remark". The REM statement is followed by the comment text and can be placed anywhere in the program.
Here are some key points to remember about using comments in QBASIC:
- Comments are used to explain the purpose and functionality of the code.
- They are ignored by the compiler and do not affect the execution of the program.
- Comments can be placed on a separate line or at the end of a line of code.
- QBASIC also supports inline comments, which are comments that are placed at the end of a line of code.
- Comments are helpful for programmers to understand their own code and for others who may read or modify the code in the future.
In summary, in QBASIC, description comments are put in the source program with the REM statement. This allows programmers to add explanations and descriptions to their code, making it more readable and understandable.

To determine which of the given options is a valid numeric variable name, we need to consider the rules for naming variables in programming languages. Here are the details for each option:
A: M8
- This is a valid numeric variable name because it starts with a letter (M) and is followed by a digit (8).
B: 8M
- This is not a valid numeric variable name because it starts with a digit (8), which is not allowed. Variable names cannot start with a digit in most programming languages.
C: $M
- This is not a valid numeric variable name because it starts with a special character ($), which is not allowed. Variable names should typically start with a letter or an underscore.
D: 2B43
- This is not a valid numeric variable name because it starts with a digit (2), which is not allowed. Variable names cannot start with a digit in most programming languages.
Therefore, the correct answer is option A: M8.

Range of Numeric Constants (Integer Type)
To determine the range of numeric constants (integer type), we need to consider the maximum and minimum values that can be represented by the integer data type. In most programming languages, the integer type is typically represented using a fixed number of bits.
The range of numeric constants (integer type) is determined by the number of bits used to represent the integer value. The most common representation is using 32 bits, which is 4 bytes.
The range of numeric constants (integer type) for a 32-bit representation is:
- The minimum value is -2,147,483,648.
- The maximum value is 2,147,483,647.
Therefore, the correct answer is B:

-2,147,483,648 to 2,147,483,647

Explanation:
- The integer type uses a fixed number of bits to represent whole numbers.
- The sign bit (the leftmost bit) determines whether the number is positive or negative.
- The remaining bits represent the magnitude of the number.
- In a 32-bit representation, the sign bit is reserved for the sign, and the remaining 31 bits are used for the magnitude.
- The range of values is evenly divided between positive and negative values, excluding zero.
Key Points:
- Numeric constants (integer type) have a range of values that can be represented by a fixed number of bits.
- The range depends on the number of bits used to represent the integer value.
- In a 32-bit representation, the range is from -2,147,483,648 to 2,147,483,647.

Answer:
The correct answer is D:

Assignment

Here is a detailed explanation of the answer:
Definition of LET statement:
- A LET statement is a type of programming statement used to assign a value to a variable in computer programming languages.
Explanation of the options:
- A:

Input

- This option is incorrect because the LET statement is used to assign a value, not to receive input.
- B:

Output

- This option is incorrect because the LET statement is used to assign a value, not to produce output.
- C:

Loop

- This option is incorrect because the LET statement is not directly related to loops. It is used to assign values, which can be used in loops, but it is not a loop statement itself.
- D:

Assignment

- This option is correct because the LET statement is used to assign a value to a variable, which is a form of assignment.
Summary:
- The LET statement is a type of programming statement used to assign a value to a variable in computer programming languages. It is commonly used for assignment purposes in various programming tasks.

Explanation:
The correct answer is C: Both (a) and (b).
To treat the rest of the line as a comment in programming, you can use either the REM keyword or an apostrophe.
- REM: REM is short for "remark" and is used as a comment in various programming languages, including BASIC and batch files. It is typically used at the beginning of a line to indicate that the line should be ignored by the compiler or interpreter.
- Apostrophe: In some programming languages, such as Visual Basic for Applications (VBA) in Microsoft Office applications, an apostrophe can be used to indicate a comment. When an apostrophe is placed at the beginning of a line, the entire line is treated as a comment and is ignored by the interpreter.
Therefore, both the REM keyword and an apostrophe can be used to treat the rest of the line as a comment in programming.
- None of these: This option is incorrect as both the REM keyword and an apostrophe can be used as comments in programming.
In summary, both the REM keyword and an apostrophe can be used to treat the rest of the line as a comment in programming languages.

A loop that begins first ends last.
Explanation:
- A nested loop is a loop inside another loop.
- The outer loop executes first and the inner loop executes inside the outer loop.
- The inner loop will complete its iterations before the outer loop moves to the next iteration.
- Therefore, the outer loop will end last, after all the iterations of the inner loop have been completed.
- This means that a nested loop begins first and ends last, making statement A true.
- Statement B is incorrect because a nested loop does not begin last and end first.
- Statement C is incorrect because the outer loop is executed before the inner loop.
- Statement D is incorrect because statement A is true for a nested loop.

REM stands for:

• Remark: REM can stand for "Remark" in certain contexts, such as when making a note or comment about something.

However, in the context of the question, REM stands for a different term.

• Remove: REM does not stand for "Remove."


• Remain: REM does not stand for "Remain."


• Remote: REM does not stand for "Remote."

Therefore, the correct answer is A: Remark.

It is important to note that the term "REM" can have different meanings depending on the context in which it is used. In this case, it is specifically referring to the abbreviation for "Remark."

Deleting an item on the hard drive:
To delete an item on the hard drive, you can use the appropriate command depending on the operating system you are using. Here are the commonly used commands:
1. KILL: This command is not typically used to delete files on a hard drive. It is more commonly used to terminate processes in certain operating systems.
2. DEL: This command is used to delete files on a hard drive in MS-DOS and Windows command prompt. It is short for "delete".
3. DELETE: This command is not a standard command for deleting files on a hard drive, but it may be supported by some operating systems or specific software applications.
4. CLS: This command is used to clear the command prompt or terminal screen, but it does not delete files on the hard drive.
In this case, the correct command to delete an item on the hard drive is DEL (option B).

Explanation:

The correct answer is B: Variable name can begin with a special character.

Here is a detailed explanation of why each statement is true or false:

1. A: Variable name can begin with letter of the English alphabet.




• This statement is true. Variable names in most programming languages can begin with a letter of the English alphabet.





2. B: Variable name can begin with a special character.




• This statement is false. Variable names typically cannot begin with a special character. They usually need to start with a letter or an underscore (_).





3. C: Variable name cannot be a reserved word.




• This statement is true. Reserved words are specific words in programming languages that have predefined meanings. They cannot be used as variable names.





4. D: Alphanumeric variable names must end with a $ sign.




• This statement is false. Alphanumeric variable names do not need to end with a $ sign. They can consist of letters, numbers, and underscores, but the $ sign is not required.

Therefore, the statement that is NOT true for a variable is B: Variable name can begin with a special character.

Command to Clear Output Screen
The command used to clear the output screen varies depending on the operating system or command-line interface being used. However, in most cases, the "CLS" command is used to clear the output screen. Here is a detailed explanation:
1. Operating Systems:
- Windows: The "CLS" command is used in Windows Command Prompt to clear the output screen.
- Linux and macOS: The "clear" command is used in the terminal to clear the output screen.
2. Command-Line Interfaces:
- Command Prompt (Windows): The "CLS" command clears the screen and moves the cursor to the top-left corner.
- PowerShell (Windows): The "Clear-Host" command is used to clear the output screen.
- Terminal (Linux/macOS): The "clear" command clears the screen and moves the cursor to the top-left corner.
3. Usage:
- In Windows Command Prompt: Simply type "CLS" and press Enter.
- In PowerShell: Type "Clear-Host" and press Enter.
- In Linux/macOS terminal: Type "clear" and press Enter.
4. Benefits:
- Clears cluttered output: Clearing the output screen allows for a clean and organized display of new information.
- Improved readability: By clearing the output screen, it becomes easier to read and understand the current output.
- Resetting the display: Clearing the screen can be helpful when starting a new task or program.
In conclusion, the "CLS" command is commonly used on Windows systems, while the "clear" command is used on Linux and macOS systems to clear the output screen. Using these commands helps improve readability and provides a fresh start for displaying new information.

GOTO Statement: True Statements
There are several statements that can be considered true for a GOTO statement:
1. Instruct the computer to go to a specific line number:
- The GOTO statement allows the programmer to specify a specific line number in the code where the program should jump to.
- This is useful when there is a need to bypass certain code sections or to repeat a particular section of code.
2. Can be used to skip some statements:
- By using a GOTO statement, the programmer can skip certain statements or code blocks and jump to a different part of the program.
- This can be helpful in situations where conditional statements or loops are not suitable for skipping certain sections of code.
3. Can be used to repeat some statements:
- The GOTO statement can also be used to repeat a specific section of code by jumping back to a previous line number.
- This can be useful in situations where a loop is not applicable or when a specific section of code needs to be repeated multiple times.
4. All of these:
- The answer option "D: All of these" is correct because all of the above statements are true for a GOTO statement.
- The GOTO statement allows the computer to go to a specific line number, skip some statements, and repeat some statements.
In conclusion, a GOTO statement is a programming construct that allows the programmer to instruct the computer to jump to a specific line number, skip certain statements, and repeat specific sections of code.

Answer:
The correct answer is A: TAB.
The TAB key is used to set the position where the next character will be shown on the screen or printed on paper. When the TAB key is pressed, the cursor moves to the next tab stop, which is a predefined position.
Here is a detailed explanation:
1. TAB:
- The TAB key is a key on the keyboard that is used to create horizontal space.
- It is commonly used in word processing programs and text editors to align text or create columns.
- When the TAB key is pressed, the cursor moves to the next tab stop.

2. Tab Stop:
- A tab stop is a predefined position on the screen or paper where the cursor stops when the TAB key is pressed.
- By default, tab stops are set at regular intervals, usually every 8 characters.
- Tab stops can be modified to align text or create custom spacing.

3. Usage:
- Pressing the TAB key multiple times moves the cursor to the next tab stop.
- It is commonly used to align text in tables or create indentation in documents.
- In programming languages, the TAB key is often used to format code for readability.

4. Other options:
- B: INPUT: The INPUT command is used to get user input in programming languages.
- C: WRITE: The WRITE command is used to write data to a file or output device.
- D: PRINT: The PRINT command is used to display output on the screen or paper.

In conclusion, the TAB key sets the position where the next character will be shown on the screen or printed on paper. It is a useful tool for aligning text and creating spacing in documents.

Answer:
The programming language BASIC was developed at Dartmouth College in 1964.
Explanation:
Here is a detailed explanation of the answer:
Background:
- BASIC stands for Beginner's All-purpose Symbolic Instruction Code.
- It was designed to be a simple and easy-to-learn programming language for beginners.
- The development of BASIC was initiated by John G. Kemeny and Thomas E. Kurtz at Dartmouth College.
Development at Dartmouth College:
- In the early 1960s, there was a need for a programming language that could be used by non-computer science students at Dartmouth College.
- John G. Kemeny and Thomas E. Kurtz recognized this need and started working on the development of BASIC.
- They aimed to create a language that would allow students to write programs easily and quickly.
Key Points:
- BASIC was developed at Dartmouth College in 1964.
- It was created to be a beginner-friendly programming language.
- John G. Kemeny and Thomas E. Kurtz were the main contributors to its development.
- The language gained popularity and was widely used in the early days of personal computers.
- It served as a foundation for many other programming languages and influenced the development of the computer industry.
In conclusion, BASIC was developed at Dartmouth College in 1964 with the goal of providing a simple and accessible programming language for beginners.

The loop within a loop is called a Nested loop.
Explanation:
A nested loop is a loop that is inside another loop. It is often used when we need to perform repetitive tasks within repetitive tasks. The inner loop will execute its set of instructions multiple times for each iteration of the outer loop.
Here are some key points to understand about nested loops:
1. Structure: The nested loop consists of an outer loop and an inner loop. The inner loop is placed inside the body of the outer loop.
2. Execution: The outer loop starts executing its iterations. For each iteration of the outer loop, the inner loop executes its iterations completely.
3. Levels: Nested loops can have multiple levels, where each level represents an additional loop inside another loop.
4. Control: Each loop has its own loop control variable(s) and termination condition(s). It is important to ensure that the loops terminate to avoid infinite looping.
5. Example: In programming, nested loops are commonly used for tasks such as matrix operations, pattern printing, or iterating through multidimensional arrays.
In conclusion, a nested loop is a loop within a loop and is used when repetitive tasks need to be performed within repetitive tasks.

Answer:
The correct statement used to stop and get information from a user using a question mark is the INPUT statement.
Explanation:
The INPUT statement in programming languages is used to prompt the user for input and store the response in a variable. It allows the program to interact with the user and gather information dynamically.
Here is a detailed explanation of the options:
- GET: This is not a valid statement to get information from a user. It is commonly used in HTTP requests to retrieve data from a server.
- QUERY: This is also not a specific statement used to get information from a user. It generally refers to a request for information or a search for data.
- QUESTION: While a question is used to gather information from a user, there is no specific programming statement called "QUESTION" to accomplish this task.
- INPUT: This is the correct statement used to stop and get information from a user using a question mark. It prompts the user to enter a value and assigns it to a variable for further processing within the program.
In conclusion, the INPUT statement is used to stop and get information from a user using a question mark.