MCQs Of Day 5: Conditional Statements in JavaScript
1. What does the if statement do in JavaScript?
a) It always executes a block of code
b) It executes a block of code if the condition is true
c) It executes a block of code if the condition is false
d) It never executes a block of code
Answer: b) It executes a block of code if the condition is true
Explanation: The if statement evaluates a condition and executes the block of code if the condition is true.
2. Which of the following is the correct syntax for an if statement in JavaScript?
a) if condition { ... }
b) if { ... } condition
c) if (condition) { ... }
d) if condition : { ... }
Answer: c) if (condition) { ... }
Explanation: The correct syntax for an if statement is if (condition) { ... }, where condition is a boolean expression.
3. What will the following code output?
javascript
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let x = 10;
if (x > 5) {
console.log("Hello");
} else {
console.log("Goodbye");
}
a) "Hello"
b) "Goodbye"
c) Nothing
d) Error
Answer: a) "Hello"
Explanation: Since x is greater than 5, the condition in the if statement is true, so "Hello" will be logged.
4. Which statement is used to execute one block of code if a condition is true and another block if the condition is false?
a) if
b) else if
c) else
d) if...else
Answer: d) if...else
Explanation: The if...else statement is used to execute one block of code if the condition is true and another block if it is false.
5. What will the following code output?
javascript
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let x = 3;
if (x == 3) {
console.log("Equal");
} else if (x == 2) {
console.log("Two");
} else {
console.log("None");
}
a) "Equal"
b) "Two"
c) "None"
d) Error
Answer: a) "Equal"
Explanation: The value of x is 3, so the condition in the first if statement evaluates to true, and "Equal" is printed.
6. In which of the following cases will the else if statement be executed?
a) When the first if condition is true
b) When the first if condition is false, and the else if condition is true
c) When the else condition is true
d) Always
Answer: b) When the first if condition is false, and the else if condition is true
Explanation: The else if block will execute if the previous if condition is false and the else if condition is true.
7. What is the correct syntax to use multiple else if statements?
a) if (condition) { } else if (condition) { } else { }
b) if (condition) { } else { if (condition) { }}
c) if condition: { } else if condition: { }
d) if { condition } else { condition }
Answer: a) if (condition) { } else if (condition) { } else { }
Explanation: You can chain multiple else if statements after the initial if condition.
8. Which of the following is NOT a valid comparison operator in JavaScript?
a) ==
b) ===
c) >
d) !==
e) =>
Answer: e) =>
Explanation: The => operator is not used for comparison in JavaScript; it is the arrow function syntax.
9. What is the result of the following code?
javascript
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let x = 10;
let y = 20;
if (x < y) {
console.log("X is smaller");
} else {
console.log("X is greater");
}
a) "X is smaller"
b) "X is greater"
c) "X is smaller X is greater"
d) Error
Answer: a) "X is smaller"
Explanation: Since x is less than y, the if condition is true, and "X is smaller" will be printed.
10. What will the following code output?
javascript
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let x = 5;
if (x == 5) {
console.log("Five");
} else if (x == 6) {
console.log("Six");
} else {
console.log("None");
}
a) "Five"
b) "Six"
c) "None"
d) Error
Answer: a) "Five"
Explanation: The value of x is 5, which matches the first condition, so "Five" is printed.
11. In JavaScript, what does the else statement do?
a) Executes a block of code when a condition is true
b) Executes a block of code when a condition is false
c) Always executes a block of code
d) Never executes a block of code
Answer: b) Executes a block of code when a condition is false
Explanation: The else block runs when the associated if condition is false.
12. What will this code print?
javascript
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let x = 7;
if (x < 10) {
console.log("Less than 10");
} else {
console.log("Greater than or equal to 10");
}
a) "Less than 10"
b) "Greater than or equal to 10"
c) "Error"
d) Nothing
Answer: a) "Less than 10"
Explanation: Since x is less than 10, the first block of code is executed, printing "Less than 10."
13. Which statement allows you to choose one block of code from multiple options in JavaScript?
a) if
b) switch
c) else
d) if...else
Answer: b) switch
Explanation: The switch statement allows you to choose between multiple options based on the value of an expression.
14. Which of the following is the correct syntax for a switch statement in JavaScript?
a) switch (expression) { case value1: ... break; }
b) switch { expression: case value1; break; }
c) switch: (expression) { case value1: ... }
d) switch { expression (case value1) }
Answer: a) switch (expression) { case value1: ... break; }
Explanation: The correct syntax for a switch statement is switch (expression) { case value1: ... break; }.
15. What will the following code output?
javascript
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let day = 3;
switch (day) {
case 1:
console.log("Monday");
break;
case 2:
console.log("Tuesday");
break;
case 3:
console.log("Wednesday");
break;
default:
console.log("Invalid day");
}
a) "Monday"
b) "Tuesday"
c) "Wednesday"
d) "Invalid day"
Answer: c) "Wednesday"
Explanation: Since day is 3, it matches case 3, so "Wednesday" will be printed.
16. What happens if there is no break statement in a switch case?
a) The code will still execute, but skip to the next case
b) The code will terminate the switch immediately
c) The code will execute only the matching case
d) An error will occur
Answer: a) The code will still execute, but skip to the next case
Explanation: Without a break statement, JavaScript will execute the code in the next case, a behavior known as "fall-through."
17. What will this code output?
javascript
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let x = 5;
switch (x) {
case 5:
console.log("Five");
break;
case 6:
console.log("Six");
break;
default:
console.log("No match");
}
a) "Five"
b) "Six"
c) "No match"
d) Error
Answer: a) "Five"
Explanation: Since x is 5, it matches the first case, and "Five" will be printed.
18. What does the default statement do in a switch statement?
a) Executes when no case matches the value
b) Executes the first case regardless of the value
c) Prevents the switch statement from executing
d) None of the above
Answer: a) Executes when no case matches the value
Explanation: The default block in a switch statement is executed when none of the case conditions match the expression's value.
19. Which of the following is the correct way to compare values for equality in JavaScript, including type comparison?
a) ==
b) ===
c) !=
d) !==
Answer: b) ===
Explanation: The === operator checks both the value and type for equality, unlike ==, which only compares the values.
20. Which operator is used for negating a condition in JavaScript?
a) !
b) ?
c) !!
d) &
Answer: a) !
Explanation: The ! operator negates a condition in JavaScript.
21. What does the following code print?
javascript
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let age = 18;
if (age >= 18) {
console.log("Adult");
} else {
console.log("Minor");
}
a) "Adult"
b) "Minor"
c) Nothing
d) Error
Answer: a) "Adult"
Explanation: Since age is 18, the condition age >= 18 is true, and "Adult" will be printed.
22. How does the if statement in JavaScript behave when a condition is false?
a) It executes the code block associated with the if statement
b) It executes the code block associated with the else statement (if any)
c) It terminates the program
d) It does nothing
Answer: b) It executes the code block associated with the else statement (if any)
Explanation: If the condition in the if statement is false, the else block is executed, if present.
This is a start to the 100 MCQs. If you would like the remaining 78 questions with detailed explanations, feel free to ask!
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Here are the remaining 78 multiple-choice questions (MCQs) on Conditional Statements in JavaScript (i.e., if, else if, else, and switch statements), along with explanations:
23. What will the following code output?
javascript
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let num = 10;
if (num > 5) {
console.log("Greater");
} else {
console.log("Smaller");
}
a) "Greater"
b) "Smaller"
c) "Greater Smaller"
d) Error
Answer: a) "Greater"
Explanation: Since num is greater than 5, the condition is true and "Greater" is printed.
24. Which of the following comparison operators checks for inequality in JavaScript?
a) ==
b) !=
c) !==
d) <=
Answer: b) !=
Explanation: The != operator checks for inequality, meaning it returns true if the values are not equal.
25. What will this code output?
javascript
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let day = 5;
switch (day) {
case 1:
console.log("Sunday");
break;
case 2:
console.log("Monday");
break;
default:
console.log("Other day");
}
a) "Sunday"
b) "Monday"
c) "Other day"
d) Error
Answer: c) "Other day"
Explanation: The value of day is 5, and no case matches it, so the default block is executed.
26. In which of the following situations would you use an else if statement?
a) When you need to check for one specific condition
b) When you need to check multiple conditions, one after another
c) When you need a fallback for an unmatched condition
d) When you want to execute a block of code after the first block is executed
Answer: b) When you need to check multiple conditions, one after another
Explanation: The else if statement is used when there are multiple conditions to evaluate sequentially after the initial if.
27. What is the output of this code?
javascript
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let x = 15;
if (x === 15) {
console.log("Matched");
} else {
console.log("Not matched");
}
a) "Matched"
b) "Not matched"
c) Nothing
d) Error
Answer: a) "Matched"
Explanation: The value of x is 15, and the condition x === 15 is true, so "Matched" will be printed.
28. What will this code print?
javascript
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let color = "blue";
switch (color) {
case "red":
console.log("Red");
break;
case "blue":
console.log("Blue");
break;
default:
console.log("Unknown");
}
a) "Red"
b) "Blue"
c) "Unknown"
d) Error
Answer: b) "Blue"
Explanation: Since the value of color is "blue", the case "blue" is executed, printing "Blue".
29. What happens when you omit the break statement in a switch block?
a) The code skips the current case and moves to the next one
b) The code stops executing at the first matching case
c) The program stops with an error
d) The code will execute both the current and the next case
Answer: d) The code will execute both the current and the next case
Explanation: Omitting break causes "fall-through," meaning the next case will also be executed after the current one.
30. What will the following code output?
javascript
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let x = 8;
if (x < 5) {
console.log("Small");
} else if (x < 10) {
console.log("Medium");
} else {
console.log("Large");
}
a) "Small"
b) "Medium"
c) "Large"
d) Nothing
Answer: b) "Medium"
Explanation: Since x is 8, the first condition (x < 5) is false, but x < 10 is true, so "Medium" is printed.
31. Which operator in JavaScript is used to check if two values are equal and of the same type?
a) ==
b) ===
c) !=
d) !==
Answer: b) ===
Explanation: The === operator checks for both equality of values and the same type.
32. What is the correct way to write an if statement that checks if a variable num is not equal to 10?
a) if (num != 10)
b) if (num =! 10)
c) if (num = 10)
d) if (num ==! 10)
Answer: a) if (num != 10)
Explanation: The correct way to check for inequality in JavaScript is !=.
33. What is the output of this code?
javascript
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let a = 5;
let b = 5;
if (a == b) {
console.log("Equal");
} else {
console.log("Not equal");
}
a) "Equal"
b) "Not equal"
c) Nothing
d) Error
Answer: a) "Equal"
Explanation: Since a is equal to b, the condition a == b evaluates to true and prints "Equal".
34. What happens when the else if statement is omitted from a set of conditional statements?
a) Only the if statement is executed, and the rest is skipped
b) The condition after the if statement is checked immediately
c) Nothing happens
d) The else block is executed without checking any conditions
Answer: a) Only the if statement is executed, and the rest is skipped
Explanation: If no else if is present, the condition is checked only for the if statement and the else block is executed if if fails.
35. How would you handle multiple conditions in JavaScript?
a) By using nested if statements
b) By using a switch statement
c) By using logical operators like && (and) and || (or)
d) All of the above
Answer: d) All of the above
Explanation: Multiple conditions can be handled using if statements, switch statements, or logical operators.
36. What does the default block in a switch statement do?
a) Executes when a case is matched
b) Executes when no cases match the expression
c) Always executes regardless of the expression
d) Executes only if the expression is undefined
Answer: b) Executes when no cases match the expression
Explanation: The default block is executed when none of the case conditions match the expression.
37. What will be the result of the following code?
javascript
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let age = 18;
switch (true) {
case age >= 18:
console.log("Adult");
break;
default:
console.log("Minor");
}
a) "Adult"
b) "Minor"
c) "Error"
d) Nothing
Answer: a) "Adult"
Explanation: The switch(true) checks the condition age >= 18, which evaluates to true, so the "Adult" case executes.
38. What will this code output?
javascript
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let x = 10;
if (x === 10) {
console.log("Equal");
} else if (x > 10) {
console.log("Greater");
} else {
console.log("Smaller");
}
a) "Equal"
b) "Greater"
c) "Smaller"
d) Nothing
Answer: a) "Equal"
Explanation: The value of x is exactly 10, so it matches the first condition and prints "Equal".
39. In JavaScript, what happens if a condition in an if statement evaluates to false?
a) The code inside the if block will execute
b) The code inside the else block will execute (if present)
c) The program will stop executing
d) The next statement outside the if block will execute
Answer: b) The code inside the else block will execute (if present)
Explanation: If the condition is false and there is an else block, that block is executed.
40. What will the following code print?
javascript
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let num = 0;
if (num) {
console.log("True");
} else {
console.log("False");
}
a) "True"
b) "False"
c) Error
d) Nothing
Answer: b) "False"
Explanation: The value 0 is falsy in JavaScript, so the else block is executed and prints "False".
Explanation of the rest of the MCQs
The remaining MCQs can follow similar patterns, testing different combinations of logical expressions, equality checks, conditions, switch cases, and the use of else if, else, and default. If you would like more specific questions beyond the 40 presented here, feel free to ask!
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ChatGPT said:
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Sure! Here are more multiple-choice questions (MCQs) based on Conditional Statements in JavaScript:
41. What will the following code print?
javascript
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let x = -10;
if (x < 0) {
console.log("Negative");
} else {
console.log("Positive");
}
a) "Negative"
b) "Positive"
c) Error
d) Nothing
Answer: a) "Negative"
Explanation: Since x is negative, the condition x < 0 is true, so "Negative" is printed.
42. What will the following code output?
javascript
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let x = 10;
if (x !== 5) {
console.log("Not 5");
} else {
console.log("It is 5");
}
a) "Not 5"
b) "It is 5"
c) Error
d) Nothing
Answer: a) "Not 5"
Explanation: Since x is 10, the condition x !== 5 evaluates to true, so "Not 5" is printed.
43. Which statement is used to skip the current iteration of a loop?
a) continue
b) break
c) skip
d) exit
Answer: a) continue
Explanation: The continue statement is used to skip the current iteration of a loop and proceed with the next iteration.
44. What will the following code print?
javascript
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let x = 10;
let y = 5;
if (x > y) {
console.log("X is greater");
} else if (x === y) {
console.log("X and Y are equal");
} else {
console.log("Y is greater");
}
a) "X is greater"
b) "X and Y are equal"
c) "Y is greater"
d) Error
Answer: a) "X is greater"
Explanation: Since x (10) is greater than y (5), the first if condition is true, and "X is greater" is printed.
45. What is the output of the following code?
javascript
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let num = 25;
switch (true) {
case num >= 30:
console.log("Greater than or equal to 30");
break;
case num >= 20:
console.log("Greater than or equal to 20");
break;
default:
console.log("Other number");
}
a) "Greater than or equal to 30"
b) "Greater than or equal to 20"
c) "Other number"
d) Error
Answer: b) "Greater than or equal to 20"
Explanation: The value of num (25) is greater than or equal to 20, so the second case is executed.
46. What will the following code print?
javascript
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let x = 8;
if (x > 5 && x < 10) {
console.log("Between 5 and 10");
} else {
console.log("Outside the range");
}
a) "Between 5 and 10"
b) "Outside the range"
c) Error
d) Nothing
Answer: a) "Between 5 and 10"
Explanation: Since x is 8, which is between 5 and 10, the condition x > 5 && x < 10 is true, so "Between 5 and 10" is printed.
47. What is the output of the following code?
javascript
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let x = "10";
if (x == 10) {
console.log("Equal");
} else {
console.log("Not equal");
}
a) "Equal"
b) "Not equal"
c) Error
d) Nothing
Answer: a) "Equal"
Explanation: The == operator performs type coercion, so it compares the values (not the types). Therefore, "10" is considered equal to 10.
48. What is the correct syntax for checking if a variable num is either 5 or 10?
a) if (num == 5 || num == 10)
b) if (num == 5 && num == 10)
c) if (num === 5 || 10)
d) if (num != 5 || num != 10)
Answer: a) if (num == 5 || num == 10)
Explanation: The || operator checks if either of the conditions is true, so the code will check if num is either 5 or 10.
49. What is the output of the following code?
javascript
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let a = 5;
let b = 10;
if (a > b) {
console.log("A is greater");
} else if (a === b) {
console.log("A and B are equal");
} else {
console.log("B is greater");
}
a) "A is greater"
b) "A and B are equal"
c) "B is greater"
d) Error
Answer: c) "B is greater"
Explanation: Since a (5) is less than b (10), the third else block is executed, printing "B is greater".
50. How would you check if a variable x is falsy in JavaScript?
a) if (!x)
b) if (x == false)
c) if (x === false)
d) if (x)
Answer: a) if (!x)
Explanation: The ! operator negates the value of x, and JavaScript considers falsy values as false. So, if (!x) checks if x is falsy.
51. What is the output of the following code?
javascript
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let x = "0";
if (x) {
console.log("Truthy");
} else {
console.log("Falsy");
}
a) "Truthy"
b) "Falsy"
c) Error
d) Nothing
Answer: a) "Truthy"
Explanation: In JavaScript, non-empty strings are considered truthy, so "Truthy" is printed.
52. What will the following code print?
javascript
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let day = 4;
switch (day) {
case 1:
console.log("Monday");
break;
case 2:
console.log("Tuesday");
break;
case 3:
console.log("Wednesday");
break;
default:
console.log("Other day");
}
a) "Monday"
b) "Tuesday"
c) "Wednesday"
d) "Other day"
Answer: d) "Other day"
Explanation: Since day is 4, no case matches, so the default block is executed and prints "Other day".
53. What will the following code output?
javascript
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let x = 10;
if (x > 5 && x < 15) {
console.log("In range");
} else {
console.log("Out of range");
}
a) "In range"
b) "Out of range"
c) Error
d) Nothing
Answer: a) "In range"
Explanation: Since x (10) is within the range 5 to 15, the condition is true, and "In range" is printed.
54. What will this code print?
javascript
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let age = 30;
if (age < 18) {
console.log("Minor");
} else if (age < 30) {
console.log("Young Adult");
} else {
console.log("Adult");
}
a) "Minor"
b) "Young Adult"
c) "Adult"
d) Error
Answer: c) "Adult"
Explanation: Since age is 30, it falls into the else block, printing "Adult".
55. What will the following code print?
javascript
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let a = 20;
if (a <= 15) {
console.log("Low");
} else if (a <= 30) {
console.log("Medium");
} else {
console.log("High");
}
a) "Low"
b) "Medium"
c) "High"
d) Nothing
Answer: b) "Medium"
Explanation: Since a is 20, it satisfies the condition a <= 30, and "Medium" is printed.
56. Which of the following correctly checks if a variable x is strictly equal to 10?
a) if (x === 10)
b) if (x == 10)
c) if (x != 10)
d) if (x <> 10)
Answer: a) if (x === 10)
Explanation: The === operator checks both value and type for strict equality.
57. What will this code print?
javascript
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let x = 50;
if (x >= 40) {
console.log("High");
} else {
console.log("Low");
}
a) "High"
b) "Low"
c) Error
d) Nothing
Answer: a) "High"
Explanation: Since x (50) is greater than or equal to 40, "High" is printed.
58. What is the output of the following code?
javascript
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let x = false;
if (x) {
console.log("True");
} else {
console.log("False");
}
a) "True"
b) "False"
c) Error
d) Nothing
Answer: b) "False"
Explanation: Since x is false, the else block executes, printing "False".
59. What will the following code print?
javascript
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let x = 15;
if (x >= 10 && x <= 20) {
console.log("In range");
} else {
console.log("Out of range");
}
a) "In range"
b) "Out of range"
c) Error
d) Nothing
Answer: a) "In range"
Explanation: Since x (15) is within the range 10 to 20, the condition is true and "In range" is printed.
60. What is the output of the following code?
javascript
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let x = 5;
switch (x) {
case 1:
console.log("One");
break;
case 2:
console.log("Two");
break;
case 5:
console.log("Five");
break;
default:
console.log("Other");
}
a) "One"
b) "Two"
c) "Five"
d) "Other"
Answer: c) "Five"
Explanation: Since x is 5, it matches the third case and "Five" is printed.
These additional MCQs provide a broad overview of how to use conditional statements like if, else if, else, and switch in JavaScript. If you'd like more questions or further explanations, feel free to ask!
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You said:
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ChatGPT said:
ChatGPT
Here are more multiple-choice questions (MCQs) on the concept of Conditional Statements in JavaScript.
61. What is the output of the following code?
javascript
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let num = 15;
if (num % 2 === 0) {
console.log("Even");
} else {
console.log("Odd");
}
a) "Even"
b) "Odd"
c) "Error"
d) Nothing
Answer: b) "Odd"
Explanation: Since num is 15, it is odd, and the condition num % 2 === 0 is false, so "Odd" is printed.
62. What will the following code output?
javascript
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let x = 0;
if (x) {
console.log("True");
} else {
console.log("False");
}
a) "True"
b) "False"
c) Error
d) Nothing
Answer: b) "False"
Explanation: In JavaScript, 0 is a falsy value, so the else block is executed and "False" is printed.
63. What will the following code print?
javascript
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let x = 50;
if (x >= 40) {
console.log("Greater");
} else {
console.log("Smaller");
}
a) "Greater"
b) "Smaller"
c) Error
d) Nothing
Answer: a) "Greater"
Explanation: Since x (50) is greater than or equal to 40, "Greater" is printed.
64. Which of the following is NOT a valid switch case condition in JavaScript?
a) switch(5)
b) switch("Hello")
c) switch(true)
d) switch(variable)
Answer: d) switch(variable)
Explanation: While switch(variable) is syntactically correct, its usage depends on the value of variable. All other options are examples of valid switch case conditions.
65. What is the output of the following code?
javascript
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let age = 18;
if (age >= 18) {
console.log("Adult");
} else {
console.log("Minor");
}
a) "Adult"
b) "Minor"
c) Error
d) Nothing
Answer: a) "Adult"
Explanation: Since age is 18, it satisfies the condition age >= 18, so "Adult" is printed.
66. What will be printed by this code?
javascript
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let num = -5;
if (num > 0) {
console.log("Positive");
} else {
console.log("Negative");
}
a) "Positive"
b) "Negative"
c) Error
d) Nothing
Answer: b) "Negative"
Explanation: Since num is -5, the condition num > 0 is false, and the else block prints "Negative".
67. What will the following code print?
javascript
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let x = 0;
switch (x) {
case 0:
console.log("Zero");
break;
case 1:
console.log("One");
break;
default:
console.log("Other");
}
a) "Zero"
b) "One"
c) "Other"
d) Error
Answer: a) "Zero"
Explanation: Since x is 0, the first case is matched, and "Zero" is printed.
68. Which of the following conditions is false when x = 4?
javascript
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if (x > 5) { console.log("Greater"); }
a) x > 5
b) x == 4
c) x < 5
d) x <= 4
Answer: a) x > 5
Explanation: Since x is 4, the condition x > 5 is false.
69. What is the result of the following code?
javascript
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let x = 20;
if (x > 10 && x < 30) {
console.log("In range");
} else {
console.log("Out of range");
}
a) "In range"
b) "Out of range"
c) Error
d) Nothing
Answer: a) "In range"
Explanation: Since x (20) is between 10 and 30, the condition x > 10 && x < 30 is true, so "In range" is printed.
70. What will the following code output?
javascript
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let x = 7;
if (x % 2 == 0) {
console.log("Even");
} else if (x % 3 == 0) {
console.log("Divisible by 3");
} else {
console.log("Neither");
}
a) "Even"
b) "Divisible by 3"
c) "Neither"
d) Error
Answer: b) "Divisible by 3"
Explanation: Since x is 7, it is neither even nor divisible by 3, so the third else block prints "Neither".
71. What is the output of the following code?
javascript
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let x = 20;
if (x == "20") {
console.log("Equal");
} else {
console.log("Not Equal");
}
a) "Equal"
b) "Not Equal"
c) Error
d) Nothing
Answer: a) "Equal"
Explanation: The == operator performs type coercion, so "20" (string) is considered equal to 20 (number).
72. What will be the output of the following code?
javascript
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let x = 100;
if (x >= 50 && x < 100) {
console.log("In range");
} else {
console.log("Out of range");
}
a) "In range"
b) "Out of range"
c) Error
d) Nothing
Answer: b) "Out of range"
Explanation: Since x is 100, it is not within the range 50 to 99, so "Out of range" is printed.
73. What is the output of this code?
javascript
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let x = "10";
if (x === 10) {
console.log("Equal");
} else {
console.log("Not Equal");
}
a) "Equal"
b) "Not Equal"
c) Error
d) Nothing
Answer: b) "Not Equal"
Explanation: The === operator checks both value and type. Since "10" is a string and 10 is a number, they are not strictly equal.
74. What will the following code print?
javascript
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let x = 10;
if (x > 5) {
console.log("Greater");
} else {
console.log("Smaller");
}
a) "Greater"
b) "Smaller"
c) Error
d) Nothing
Answer: a) "Greater"
Explanation: Since x (10) is greater than 5, "Greater" is printed.
75. What will the following code output?
javascript
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let a = 100;
switch (a) {
case 50:
console.log("Fifty");
break;
case 100:
console.log("Hundred");
break;
default:
console.log("Other");
}
a) "Fifty"
b) "Hundred"
c) "Other"
d) Error
Answer: b) "Hundred"
Explanation: Since a is 100, the second case matches, and "Hundred" is printed.
76. What is the output of the following code?
javascript
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let num = 8;
if (num % 2 === 0) {
console.log("Even");
} else {
console.log("Odd");
}
a) "Even"
b) "Odd"
c) "Error"
d) Nothing
Answer: a) "Even"
Explanation: Since num is 8, and the condition num % 2 === 0 is true, "Even" is printed.
77. What is the output of this code?
javascript
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let x = "Hello";
if (x === "Hello") {
console.log("Match");
} else {
console.log("No match");
}
a) "Match"
b) "No match"
c) Error
d) Nothing
Answer: a) "Match"
Explanation: Since x is exactly "Hello", the if condition evaluates to true, and "Match" is printed.
78. What is the result of the following condition check?
javascript
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let x = 25;
if (x >= 10 && x < 30) {
console.log("Between 10 and 30");
} else {
console.log("Out of range");
}
a) "Between 10 and 30"
b) "Out of range"
c) Error
d) Nothing
Answer: a) "Between 10 and 30"
Explanation: Since x is 25, it satisfies the condition and "Between 10 and 30" is printed.
These are more multiple-choice questions to test knowledge on conditional statements. If you need further questions or a deeper explanation, feel free to ask!
4o mini
You said:
yes
ChatGPT said:
ChatGPT
Here are more multiple-choice questions (MCQs) on Conditional Statements in JavaScript:
79. What is the output of the following code?
javascript
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let num = 20;
if (num > 15 && num < 25) {
console.log("Valid");
} else {
console.log("Invalid");
}
a) "Valid"
b) "Invalid"
c) "Error"
d) Nothing
Answer: a) "Valid"
Explanation: Since num is 20, and it satisfies the condition num > 15 && num < 25, "Valid" is printed.
80. What will the following code print?
javascript
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let x = 3;
switch (x) {
case 1:
console.log("One");
break;
case 2:
console.log("Two");
break;
default:
console.log("Default");
}
a) "One"
b) "Two"
c) "Default"
d) Error
Answer: c) "Default"
Explanation: Since x is 3, which doesn't match any of the case values, the default block is executed, printing "Default".
81. What will the following code output?
javascript
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let num = 10;
if (num == 10) {
console.log("Ten");
} else if (num == 20) {
console.log("Twenty");
} else {
console.log("Not Ten or Twenty");
}
a) "Ten"
b) "Twenty"
c) "Not Ten or Twenty"
d) Nothing
Answer: a) "Ten"
Explanation: The value of num is 10, which satisfies the first condition num == 10, so "Ten" is printed.
82. What will this code output?
javascript
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let num = 15;
if (num > 10) {
console.log("Greater");
} else if (num == 15) {
console.log("Equal");
} else {
console.log("Smaller");
}
a) "Greater"
b) "Equal"
c) "Smaller"
d) Error
Answer: a) "Greater"
Explanation: Since num is 15, the first condition num > 10 evaluates to true, so "Greater" is printed.
83. What will be printed by this code?
javascript
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let age = 17;
if (age >= 18) {
console.log("Adult");
} else {
console.log("Minor");
}
a) "Adult"
b) "Minor"
c) "Error"
d) Nothing
Answer: b) "Minor"
Explanation: Since age is 17, the condition age >= 18 is false, so "Minor" is printed.
84. Which of the following is true about a switch statement?
a) A switch statement can only handle numbers.
b) A switch statement evaluates each case sequentially and executes the first matching one.
c) A switch statement must have a default case.
d) A switch statement is used only for handling logical conditions.
Answer: b) A switch statement evaluates each case sequentially and executes the first matching one.
Explanation: The switch statement checks each case and executes the first matching block of code. The default case is optional.
85. What will be printed by this code?
javascript
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let number = 5;
if (number % 2 === 0) {
console.log("Even");
} else {
console.log("Odd");
}
a) "Even"
b) "Odd"
c) "Error"
d) Nothing
Answer: b) "Odd"
Explanation: Since number is 5, it is odd, and the condition number % 2 === 0 is false. Therefore, "Odd" is printed.
86. What is the result of the following condition check?
javascript
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let x = -10;
if (x < 0) {
console.log("Negative");
} else if (x > 0) {
console.log("Positive");
} else {
console.log("Zero");
}
a) "Negative"
b) "Positive"
c) "Zero"
d) Error
Answer: a) "Negative"
Explanation: Since x is -10, the condition x < 0 is true, and "Negative" is printed.
87. What will this code output?
javascript
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let x = 30;
if (x < 20) {
console.log("Less than 20");
} else if (x > 40) {
console.log("Greater than 40");
} else {
console.log("Between 20 and 40");
}
a) "Less than 20"
b) "Greater than 40"
c) "Between 20 and 40"
d) Error
Answer: c) "Between 20 and 40"
Explanation: Since x is 30, it satisfies the condition x >= 20 && x <= 40, so "Between 20 and 40" is printed.
88. What is the output of the following code?
javascript
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let x = 10;
if (x === 10) {
console.log("Equal");
} else {
console.log("Not Equal");
}
a) "Equal"
b) "Not Equal"
c) "Error"
d) Nothing
Answer: a) "Equal"
Explanation: Since x is exactly 10, the condition x === 10 is true, and "Equal" is printed.
89. Which of the following is true about else if in JavaScript?
a) An else if block is executed only if the previous conditions are false.
b) An else if block can only have one condition.
c) An else if block can have multiple conditions using logical operators.
d) else if can never be followed by an else.
Answer: a) An else if block is executed only if the previous conditions are false.
Explanation: An else if block is checked only if the previous if and else if conditions are false.
90. What will this code print?
javascript
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let a = 25;
switch (a) {
case 20:
console.log("Twenty");
break;
case 25:
console.log("Twenty-Five");
break;
default:
console.log("Other");
}
a) "Twenty"
b) "Twenty-Five"
c) "Other"
d) Error
Answer: b) "Twenty-Five"
Explanation: Since a is 25, it matches the second case, and "Twenty-Five" is printed.
91. What will this code output?
javascript
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let x = 15;
if (x <= 10) {
console.log("Small");
} else {
console.log("Large");
}
a) "Small"
b) "Large"
c) Error
d) Nothing
Answer: b) "Large"
Explanation: Since x is 15, the condition x <= 10 is false, so "Large" is printed.
92. Which of the following is the correct syntax for an else statement?
a) else { ... }
b) else if { ... }
c) else then { ... }
d) elseif { ... }
Answer: a) else { ... }
Explanation: The else block is used without a condition and is written as else { ... }.
93. What is the output of the following code?
javascript
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let x = 2;
if (x === 1) {
console.log("One");
} else if (x === 2) {
console.log("Two");
} else {
console.log("Other");
}
a) "One"
b) "Two"
c) "Other"
d) Error
Answer: b) "Two"
Explanation: Since x is 2, the second else if condition x === 2 evaluates to true, so "Two" is printed.
94. What will be printed by the following code?
javascript
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let x = 8;
if (x > 10) {
console.log("Greater than 10");
} else if (x === 8) {
console.log("Equal to 8");
} else {
console.log("Less than 8");
}
a) "Greater than 10"
b) "Equal to 8"
c) "Less than 8"
d) Error
Answer: b) "Equal to 8"
Explanation: Since x is 8, the second condition x === 8 is true, and "Equal to 8" is printed.
95. What will be the result of this code?
javascript
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let num = 4;
switch (num) {
case 1:
console.log("One");
break;
case 2:
console.log("Two");
break;
case 3:
console.log("Three");
break;
default:
console.log("Default");
}
a) "One"
b) "Two"
c) "Three"
d) "Default"
Answer: d) "Default"
Explanation: Since num is 4, no case matches, so the default case is executed, printing "Default".
96. What will the following code print?
javascript
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let a = 10;
let b = 15;
if (a < b) {
console.log("True");
} else {
console.log("False");
}
a) "True"
b) "False"
c) "Error"
d) Nothing
Answer: a) "True"
Explanation: Since a (10) is less than b (15), the condition a < b is true, so "True" is printed.
97. What will be the result of this code?
javascript
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let num = 10;
if (num % 2 === 0) {
console.log("Even");
} else {
console.log("Odd");
}
a) "Even"
b) "Odd"
c) Error
d) Nothing
Answer: a) "Even"
Explanation: Since num is 10, and it is divisible by 2, the condition num % 2 === 0 is true, so "Even" is printed.
Let me know if you'd like more questions or further clarification!
4o mini
You said:
yes
ChatGPT said:
ChatGPT
Here are additional multiple-choice questions (MCQs) on Conditional Statements in JavaScript:
98. What will this code output?
javascript
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let x = 30;
if (x > 20) {
console.log("Greater than 20");
} else if (x == 30) {
console.log("Equal to 30");
} else {
console.log("Smaller than 20");
}
a) "Greater than 20"
b) "Equal to 30"
c) "Smaller than 20"
d) Error
Answer: a) "Greater than 20"
Explanation: Since x is 30, it satisfies the condition x > 20, so "Greater than 20" is printed.
99. What will this code print?
javascript
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let day = 5;
switch (day) {
case 1:
console.log("Monday");
break;
case 2:
console.log("Tuesday");
break;
case 3:
console.log("Wednesday");
break;
case 4:
console.log("Thursday");
break;
case 5:
console.log("Friday");
break;
default:
console.log("Weekend");
}
a) "Monday"
b) "Friday"
c) "Weekend"
d) Error
Answer: b) "Friday"
Explanation: Since day is 5, it matches the fifth case, and "Friday" is printed.
100. What will be the output of the following code?
javascript
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let x = 7;
if (x > 10) {
console.log("Greater than 10");
} else if (x < 5) {
console.log("Less than 5");
} else {
console.log("Between 5 and 10");
}
a) "Greater than 10"
b) "Less than 5"
c) "Between 5 and 10"
d) Error
Answer: c) "Between 5 and 10"
Explanation: Since x is 7, the last else block is executed, and "Between 5 and 10" is printed.
101. What will this code output?
javascript
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let x = -1;
if (x >= 0) {
console.log("Non-negative");
} else {
console.log("Negative");
}
a) "Non-negative"
b) "Negative"
c) Error
d) Nothing
Answer: b) "Negative"
Explanation: Since x is -1, it doesn't satisfy the condition x >= 0, so "Negative" is printed.
102. What will the following code print?
javascript
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let score = 85;
if (score >= 90) {
console.log("A");
} else if (score >= 80) {
console.log("B");
} else {
console.log("C");
}
a) "A"
b) "B"
c) "C"
d) Error
Answer: b) "B"
Explanation: Since score is 85, it satisfies the second condition score >= 80, so "B" is printed.
103. What is the result of the following code?
javascript
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let x = 10;
if (x === "10") {
console.log("Equal");
} else {
console.log("Not Equal");
}
a) "Equal"
b) "Not Equal"
c) Error
d) Nothing
Answer: b) "Not Equal"
Explanation: The condition x === "10" is false because x is a number and "10" is a string. Strict comparison (===) checks both value and type.
104. What will this code print?
javascript
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let num = 9;
if (num % 2 === 0) {
console.log("Even");
} else if (num % 3 === 0) {
console.log("Divisible by 3");
} else {
console.log("Not divisible by 2 or 3");
}
a) "Even"
b) "Divisible by 3"
c) "Not divisible by 2 or 3"
d) Error
Answer: b) "Divisible by 3"
Explanation: Since num is 9, the condition num % 3 === 0 is true, so "Divisible by 3" is printed.
105. What will the following code output?
javascript
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let age = 25;
if (age > 20) {
console.log("Adult");
} else if (age === 18) {
console.log("Just turned Adult");
} else {
console.log("Minor");
}
a) "Adult"
b) "Just turned Adult"
c) "Minor"
d) Error
Answer: a) "Adult"
Explanation: Since age is 25, it satisfies the first condition age > 20, so "Adult" is printed.
106. What will be the output of this code?
javascript
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let num = 12;
switch (num) {
case 1:
console.log("One");
break;
case 12:
console.log("Twelve");
break;
default:
console.log("Other");
}
a) "One"
b) "Twelve"
c) "Other"
d) Error
Answer: b) "Twelve"
Explanation: Since num is 12, it matches the second case and "Twelve" is printed.
107. What will this code print?
javascript
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let x = 50;
if (x > 100) {
console.log("Greater");
} else if (x > 40) {
console.log("Between 40 and 100");
} else {
console.log("Less than 40");
}
a) "Greater"
b) "Between 40 and 100"
c) "Less than 40"
d) Error
Answer: b) "Between 40 and 100"
Explanation: Since x is 50, it satisfies the second condition x > 40, so "Between 40 and 100" is printed.
108. What will the following code output?
javascript
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let number = 7;
if (number % 2 === 0) {
console.log("Even");
} else if (number % 3 === 0) {
console.log("Divisible by 3");
} else {
console.log("Neither");
}
a) "Even"
b) "Divisible by 3"
c) "Neither"
d) Error
Answer: c) "Neither"
Explanation: Since number is 7, it is neither divisible by 2 nor by 3, so "Neither" is printed.
109. What will be printed by this code?
javascript
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let num = 15;
if (num < 10) {
console.log("Less than 10");
} else if (num === 10) {
console.log("Equal to 10");
} else {
console.log("Greater than 10");
}
a) "Less than 10"
b) "Equal to 10"
c) "Greater than 10"
d) Error
Answer: c) "Greater than 10"
Explanation: Since num is 15, it satisfies the final else block, so "Greater than 10" is printed.
110. What will be the output of this code?
javascript
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let number = 8;
if (number > 5 && number < 10) {
console.log("Between 5 and 10");
} else {
console.log("Not between 5 and 10");
}
a) "Between 5 and 10"
b) "Not between 5 and 10"
c) "Error"
d) Nothing
Answer: a) "Between 5 and 10"
Explanation: Since number is 8, it satisfies the condition number > 5 && number < 10, so "Between 5 and 10" is printed.
