JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 802 · 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 score = 14;
   score = score + 2;
   score = score - 16;
   console.log(score);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
3. 3.⚡ What number does this code print?
   let marks = 8;
   marks = marks + 10;
   marks = marks - 7;
   console.log(marks);
4. 4.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) 11 (b) Error (c) 29
6. 6.⚡ What number does this code print?
   let a = 40;
   let b = 12;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 33;
   let b = 40;
   console.log(a + b);
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
9. 9.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
10. 10.⚡ What number does this code print?
    let a = 26;
    let b = 29;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 17;
    let b = 11;
    console.log(a - b);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
14. 14.⚡ What number does this code print?
    let score = 16;
    score = score + 14;
    score = score - 15;
    console.log(score);
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
16. 16.⚡ What number does this code print?
    let score = 9;
    score = score + 20;
    score = score - 16;
    console.log(score);
17. 17.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
18. 18.⚡ What number does this code print?
    let score = 18;
    score = score + 14;
    score = score - 22;
    console.log(score);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) 12 (c) Error
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
21. 21.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let score = 25;
    score = score + 14;
    score = score - 39;
    console.log(score);
23. 23.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 20;
    runs = runs - 9;
    console.log(runs);
24. 24.⚡ What number does this code print?
    let a = 50;
    let b = 4;
    console.log(a + b);
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) Meera (d) name
26. 26.⚡ What number does this code print?
    let a = 49;
    let b = 29;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 4;
    apples = apples - 26;
    console.log(apples);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, name! (d) Welcome, Zoya!
29. 29.⚡ What number does this code print?
    let a = 38;
    let b = 23;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let books = 30;
    books = books + 12;
    books = books - 40;
    console.log(books);
31. 31.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 4;
    coins = coins - 3;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 5;
    apples = apples - 10;
    console.log(apples);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
34. 34.⚡ What number does this code print?
    let score = 25;
    score = score + 5;
    score = score - 21;
    console.log(score);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
36. 36.⚡ What number does this code print?
    let books = 16;
    books = books + 13;
    books = books - 25;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
39. 39.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 4;
    runs = runs - 26;
    console.log(runs);
40. 40.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for

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