JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 599 · 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 shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
2. 2.⚡ What number does this code print?
   let a = 48;
   let b = 27;
   console.log(a - b);
3. 3.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) let
4. 4.⚡ What number does this code print?
   let a = 6;
   let b = 10;
   console.log(a * b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) Error (b) 33 (c) 6
6. 6.⚡ What number does this code print?
   let a = 15;
   let b = 10;
   console.log(a + b);
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
9. 9.⚡ What number does this code print?
   let a = 54;
   let b = 3;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 23;
    let b = 26;
    console.log(a + b);
11. 11.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 32;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 13;
    apples = apples - 1;
    console.log(apples);
14. 14.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
15. 15.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
16. 16.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) 14 (c) Error
21. 21.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) name (c) Meera (d) Well done, name!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11
25. 25.⚡ What number does this code print?
    let a = 47;
    let b = 38;
    console.log(a + b);
26. 26.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
27. 27.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
28. 28.⚡ What number does this code print?
    let score = 21;
    score = score + 20;
    score = score - 4;
    console.log(score);
29. 29.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 16;
    marks = marks - 24;
    console.log(marks);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 35 (c) 8
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
33. 33.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
34. 34.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 4;
    runs = runs - 11;
    console.log(runs);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
37. 37.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
38. 38.⚡ What number does this code print?
    let books = 24;
    books = books + 17;
    books = books - 17;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
40. 40.⚡ What number does this code print?
    let a = 45;
    let b = 2;
    console.log(a - b);

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