JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 83 · 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 does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 8 (b) Error (c) 71
3. 3.⚡ What number does this code print?
   let score = 17;
   score = score + 9;
   score = score - 26;
   console.log(score);
4. 4.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 7;
   console.log(x + y); (a) 11 (b) Error (c) 47
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
8. 8.⚡ What number does this code print?
   let a = 29;
   let b = 2;
   console.log(a + b);
9. 9.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
10. 10.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 14;
    coins = coins - 10;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let score = 22;
    score = score + 15;
    score = score - 8;
    console.log(score);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
13. 13.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
14. 14.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 11;
    apples = apples - 24;
    console.log(apples);
15. 15.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) for
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Arjun (d) Hello, name!
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!
19. 19.⚡ What number does this code print?
    let books = 20;
    books = books + 9;
    books = books - 21;
    console.log(books);
20. 20.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 3;
    runs = runs - 7;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
22. 22.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
23. 23.⚡ What number does this code print?
    let a = 20;
    let b = 13;
    console.log(a - b);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
25. 25.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) 12 (c) Error
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 12;
    apples = apples - 23;
    console.log(apples);
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) name (d) Hello, Arjun!
31. 31.⚡ What number does this code print?
    let a = 24;
    let b = 2;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) 92 (c) Error
34. 34.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 16;
    apples = apples - 3;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 47;
    let b = 37;
    console.log(a + b);
36. 36.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
37. 37.⚡ What number does this code print?
    let a = 46;
    let b = 20;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 8;
    apples = apples - 33;
    console.log(apples);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) Error (c) 59
40. 40.⚡ What number does this code print?
    let a = 16;
    let b = 7;
    console.log(a + b);

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