JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 963 · 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) console.log() (b) for (c) let (d) alert()
2. 2.⚡ What number does this code print?
   let score = 5;
   score = score + 17;
   score = score - 1;
   console.log(score);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) Error (b) 14 (c) 86
5. 5.⚡ What number does this code print?
   let a = 4;
   let b = 5;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 56;
   let b = 4;
   console.log(a - b);
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) for
8. 8.⚡ What number does this code print?
   let a = 29;
   let b = 29;
   console.log(a - b);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
10. 10.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
11. 11.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) let (d) for
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
15. 15.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 14;
    marks = marks - 9;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let a = 26;
    let b = 26;
    console.log(a - b);
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
20. 20.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 43;
    let b = 15;
    console.log(a + b);
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
24. 24.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 13;
    runs = runs - 13;
    console.log(runs);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
26. 26.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 16;
    runs = runs - 16;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 26;
    let b = 14;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 28;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
31. 31.⚡ What number does this code print?
    let a = 20;
    let b = 2;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let books = 11;
    books = books + 12;
    books = books - 14;
    console.log(books);
33. 33.⚡ What number does this code print?
    let a = 41;
    let b = 8;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 31 (c) 4
37. 37.⚡ What number does this code print?
    let a = 28;
    let b = 26;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let score = 17;
    score = score + 4;
    score = score - 1;
    console.log(score);
39. 39.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 12;
    marks = marks - 5;
    console.log(marks);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) Error (c) 11

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