JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 706 · 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.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 9;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let apples = 13;
   apples = apples + 7;
   apples = apples - 20;
   console.log(apples);
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
6. 6.⚡ What number does this code print?
   let a = 20;
   let b = 40;
   console.log(a + b);
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 17 (b) Error (c) 89
9. 9.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) for (d) if
10. 10.⚡ What number does this code print?
    let a = 37;
    let b = 3;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
12. 12.⚡ What number does this code print?
    let a = 43;
    let b = 16;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let score = 15;
    score = score + 20;
    score = score - 5;
    console.log(score);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
16. 16.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 3;
    coins = coins - 2;
    console.log(coins);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
18. 18.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
19. 19.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 17;
    runs = runs - 19;
    console.log(runs);
20. 20.⚡ What number does this code print?
    let a = 25;
    let b = 38;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 29;
    let b = 16;
    console.log(a - b);
22. 22.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
23. 23.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
24. 24.⚡ What number does this code print?
    let a = 25;
    let b = 23;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 3;
    apples = apples - 14;
    console.log(apples);
27. 27.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 7 (c) 16
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
30. 30.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 6;
    apples = apples - 30;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) Error (c) 9
33. 33.⚡ What number does this code print?
    let a = 22;
    let b = 14;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 23;
    let b = 2;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
37. 37.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 3;
    coins = coins - 6;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
40. 40.⚡ What number does this code print?
    let a = 5;
    let b = 38;
    console.log(a + b);

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