JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 724 · 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 number does this code print?
   let apples = 10;
   apples = apples + 18;
   apples = apples - 24;
   console.log(apples);
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
3. 3.⚡ What number does this code print?
   let coins = 14;
   coins = coins + 12;
   coins = coins - 5;
   console.log(coins);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 4;
   console.log(x + y); (a) 11 (b) 74 (c) Error
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
6. 6.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let runs = 12;
   runs = runs + 18;
   runs = runs - 27;
   console.log(runs);
8. 8.⚡ What number does this code print?
   let a = 2;
   let b = 12;
   console.log(a * b);
9. 9.⚡ What number does this code print?
   let a = 60;
   let b = 35;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 12;
    console.log(a + b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
13. 13.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
15. 15.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
16. 16.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 19;
    apples = apples - 17;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 56;
    let b = 25;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 43;
    let b = 18;
    console.log(a + b);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
22. 22.⚡ What number does this code print?
    let a = 28;
    let b = 28;
    console.log(a + b);
23. 23.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
25. 25.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a + b);
26. 26.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
27. 27.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
28. 28.⚡ What number does this code print?
    let a = 35;
    let b = 12;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 43;
    let b = 30;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 6;
    let b = 19;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
33. 33.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
35. 35.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 10;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a - b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
39. 39.⚡ What number does this code print?
    let score = 25;
    score = score + 12;
    score = score - 25;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 34;
    let b = 29;
    console.log(a - b);

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