JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 516 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 18 (b) Error (c) 99
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) 4 (b) Error (c) 13
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) Well done, name! (d) name
4. 4.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
6. 6.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 5;
   runs = runs - 24;
   console.log(runs);
7. 7.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) let
9. 9.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) 11 (c) Error
11. 11.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 9;
    runs = runs - 14;
    console.log(runs);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
14. 14.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
15. 15.⚡ What number does this code print?
    let a = 60;
    let b = 8;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 9;
    coins = coins - 7;
    console.log(coins);
17. 17.⚡ What number does this code print?
    let a = 42;
    let b = 10;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let books = 5;
    books = books + 14;
    books = books - 13;
    console.log(books);
19. 19.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) if
20. 20.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 17;
    marks = marks - 20;
    console.log(marks);
21. 21.⚡ Which JavaScript word repeats code? (a) let (b) if (c) alert() (d) for
22. 22.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
23. 23.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Welcome, name! (d) Aman
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) 87 (c) Error
27. 27.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 9;
    apples = apples - 11;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let a = 59;
    let b = 40;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 14 (c) 86
30. 30.⚡ What number does this code print?
    let a = 33;
    let b = 17;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
32. 32.⚡ What number does this code print?
    let score = 10;
    score = score + 19;
    score = score - 12;
    console.log(score);
33. 33.⚡ What number does this code print?
    let a = 27;
    let b = 13;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 64 (c) 10
36. 36.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 20;
    runs = runs - 24;
    console.log(runs);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
38. 38.⚡ What number does this code print?
    let a = 25;
    let b = 35;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) Error (c) 52

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