JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 422 · 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 a = 6;
   let b = 7;
   console.log(a * b);
2. 2.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
4. 4.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) Well done, name! (d) name
6. 6.⚡ What number does this code print?
   let a = 3;
   let b = 4;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let coins = 21;
   coins = coins + 3;
   coins = coins - 22;
   console.log(coins);
8. 8.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 11;
   marks = marks - 13;
   console.log(marks);
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
11. 11.⚡ What number does this code print?
    let a = 17;
    let b = 13;
    console.log(a - b);
12. 12.⚡ 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
13. 13.⚡ What number does this code print?
    let a = 17;
    let b = 40;
    console.log(a + b);
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
16. 16.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) for (d) console.log()
17. 17.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
18. 18.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
19. 19.⚡ What number does this code print?
    let score = 12;
    score = score + 9;
    score = score - 10;
    console.log(score);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 17 (c) 89
21. 21.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
22. 22.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
24. 24.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 87 (c) 15
27. 27.⚡ What number does this code print?
    let score = 8;
    score = score + 8;
    score = score - 14;
    console.log(score);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) 11 (c) Error
29. 29.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
30. 30.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
31. 31.⚡ What number does this code print?
    let books = 21;
    books = books + 3;
    books = books - 17;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
35. 35.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 15;
    coins = coins - 26;
    console.log(coins);
36. 36.⚡ What number does this code print?
    let books = 11;
    books = books + 15;
    books = books - 26;
    console.log(books);
37. 37.⚡ What number does this code print?
    let a = 56;
    let b = 16;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
40. 40.⚡ What number does this code print?
    let a = 42;
    let b = 26;
    console.log(a - b);

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