JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 978 · 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 JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) console.log() (d) for
3. 3.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
4. 4.⚡ What number does this code print?
   let a = 58;
   let b = 8;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let score = 17;
   score = score + 9;
   score = score - 8;
   console.log(score);
6. 6.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) let
8. 8.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) let
9. 9.⚡ What number does this code print?
   let a = 38;
   let b = 13;
   console.log(a + b);
10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) alert() (d) if
11. 11.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) 61 (c) Error
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
14. 14.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 17;
    runs = runs - 19;
    console.log(runs);
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10
17. 17.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
18. 18.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 6;
    marks = marks - 10;
    console.log(marks);
19. 19.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
20. 20.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
21. 21.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 14;
    marks = marks - 31;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
24. 24.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 14;
    apples = apples - 2;
    console.log(apples);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
27. 27.⚡ What number does this code print?
    let books = 6;
    books = books + 12;
    books = books - 18;
    console.log(books);
28. 28.⚡ What number does this code print?
    let a = 8;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 4;
    runs = runs - 18;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 7;
    marks = marks - 20;
    console.log(marks);
34. 34.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
35. 35.⚡ What number does this code print?
    let a = 17;
    let b = 13;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 16;
    runs = runs - 32;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 5;
    coins = coins - 11;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 28;
    console.log(a + b);

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