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✨ Computer Science Assessment ✨

COMPUTISM LAb

 HALF YEARLY EXAMINATION

Conditional and Looping Statements in BASIC-256

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Standard: Computer Studies

Max Marks: 70

Time Allowed: 3 Hours

Section A: Fill in the Blanks10 Marks

1. The conditional statements in BASIC-256 are also called statements.
2. The statement is used to repeat a set of instructions until a condition evaluates to false.
3. The is the starting number of the loop and the is the total number of times the loop must run.
4. The is a variable that keeps count of the number of times the instructions inside the loop have been executed.
5. A loop which never ends is called an loop.
6. The statement checks a condition and executes a specific block of code if true.
7. BASIC-256 provides types of looping statements primarily.
8. The keyword is used to close a WHILE loop structure.
9. Decision making in programming is handled by structures.
10. The loop variable changes its value incrementally using the parameter if specified.

Section B: Multiple Choice Questions (MCQs)10 Marks

1. Which statement is used to end the WHILE loop?
   • a. END WHILE
   • b. WHILE
   • c. END-WHILE
   • d. STOP
2. Which of the following is not a conditional statement in BASIC-256?
   • a. IF-THEN
   • b. IF-THEN-ELSE
   • c. FOR-NEXT
   • d. None of these
3. Which loop statement do we use when we don't know the exact loop count?
   • a. WHILE
   • b. FOR
   • c. Both a and b
   • d. IF
4. What does a loop do in programming?
   • a. Repeats a section
   • b. Sets a variable
   • c. Print Hello
   • d. Terminate program
5. In the statement FOR n = 1 TO 100, what is 1?
   • a. Branch
   • b. Counter variable
   • c. Start value
   • d. Condition
6. Which keyword starts a definite loop in BASIC-256?
   • a. FOR
   • b. WHILE
   • c. LOOP
   • d. REPEAT
7. What type of statement is IF-THEN?
   • a. Sequential
   • b. Conditional / Decision making
   • c. Looping
   • d. Input command
8. What is an infinite loop?
   • a. A loop that never ends
   • b. A loop running 100 times
   • c. A fast loop
   • d. An error message
9. Which statement is used alongside FOR to increment and conclude the loop structure?
   • a. NEXT
   • b. STOP
   • c. END
   • d. BREAK
10. What happens if the condition in an IF-THEN statement evaluates to false?
    • a. Statement block is skipped
    • b. Program crashes
    • c. Loop starts
    • d. Infinite loop runs

Section C: Assertion-Based MCQs10 Marks

1. Assertion (A): Conditional statements alter the normal sequential flow of program execution.
   Reason (R): They allow programs to make decisions and execute specific blocks based on boolean conditions.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both A and R are true, but R is not the correct explanation of A.
   c) A is true, but R is false.
   d) A is false, but R is true.
2. Assertion (A): The FOR-NEXT statement is a definite loop structure.
   Reason (R): It runs for a fixed and predetermined number of times controlled by start and end counters.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both A and R are true, but unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
3. Assertion (A): An infinite loop terminates automatically after running 10 times.
   Reason (R): An infinite loop condition never becomes false, causing it to run continuously forever.
   a) Both A and R are true.
   b) A is true, but R is false.
   c) A is false, but R is true.
   d) Both A and R are false.
4. Assertion (A): The WHILE loop checks its condition before executing the loop body statements.
   Reason (R): If the initial condition is false, the statements inside the WHILE loop may never execute.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are false.
   c) A is true, R is false.
   d) A is false, R is true.
5. Assertion (A): BASIC-256 uses the END WHILE keyword to mark the completion of a WHILE loop.
   Reason (R): Without a proper closing keyword, the interpreter cannot identify where the loop block ends.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both A and R are true, but unrelated.
   c) A is true, R is false.
   d) A is false, R is true.
6. Assertion (A): The IF-THEN-ELSE statement handles conditions with two alternate outcomes.
   Reason (R): It executes one block if the condition is true and a separate alternative block if it is false.
   a) Both A and R are true, and R is the correct explanation of A.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both A and R are false.
7. Assertion (A): A counter variable inside a loop remains constant and never changes value.
   Reason (R): Counter variables increment or decrement with each iteration to track loop progress.
   a) Both A and R are true.
   b) A is true, R is false.
   c) A is false, but R is true.
   d) Both A and R are false.
8. Assertion (A): Program branching and decision making are synonymous terms for control structures.
   Reason (R): They control code flow based on whether specified parameters evaluate as true or false.
   a) Both A and R are true, and R is the correct explanation of A.
   b) Both are false.
   c) A is true, R is false.
   d) A is false, R is true.
9. Assertion (A): Sequential statements execute line by line without skipping or repeating instructions.
   Reason (R): Sequential execution involves complex loops and conditional branching.
   a) Both A and R are true.
   b) A is true, but R is false.
   c) A is false, but R is true.
   d) Both are false.
10. Assertion (A): Using loop structures reduces code redundancy and saves programming time.
    Reason (R): Loops allow repetitive tasks to be executed cleanly through concise blocks of code.
    a) Both A and R are true, and R is the correct explanation of A.
    b) Both A and R are true, but unrelated.
    c) A is true, R is false.
    d) A is false, but R is true.

Section D: True or False10 Marks

1. The IF-THEN statement is the simplest conditional statement. (True / False)
2. The statements used to repeat a set of instructions in a program are called iterative statements or looping statements. (True / False)
3. The WHILE statement is used to repeat a task for a fixed number of times. (True / False)
4. While loop is a replacement of the IF-THEN statement. (True / False)
5. While-EndWhile loop is known as a Condition Control loop. (True / False)
6. BASIC-256 provides two types of looping statements: FOR...NEXT and IF-THEN. (True / False)
7. An infinite loop stops automatically when the computer runs out of memory. (True / False)
8. The NEXT keyword is mandatory to close a FOR loop structure in BASIC-256. (True / False)
9. Conditional statements help a program choose between different execution paths. (True / False)
10. Branching and looping are both categories of control statements. (True / False)

Section E: Two-Marks Questions & BASIC-256 Programs30 Marks

1. What is spyware?(2 Marks)
   
2. Write short note on firewall. (2 Marks)
   
3. Why antivirus is needed? (2 Marks)
   
4. Define an infinite loop and state why it occurs. (2 Marks)
   
5. What is Trojan horse? (2 Marks)
   
6. Program 1: Write a BASIC-256 program using IF-THEN to check if an entered number is positive. (4 Marks)
   
7. Program 2: Write a BASIC-256 program using FOR...NEXT to print numbers from 100 to 10. (4 Marks)
   
8. Program 3: Write a BASIC-256 program using WHILE...END WHILE to print numbers from 1 to 5. (4 Marks)
   
9. Program 4: Write a BASIC-256 program using IF-THEN-ELSE to check if a person is eligible to vote (age >= 18). (4 Marks)
   
10. Program 5: Write a BASIC-256 program using FOR...NEXT to print even numbers up to 100. (4 Marks)
    

⭐ Best of Luck for Your Examination! Code with Confidence! 🚀

CREATED BY BIJAN KRISHNA PAUL