JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 24 · 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 tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
3. 3.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 12;
   coins = coins - 36;
   console.log(coins);
4. 4.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
5. 5.⚡ What number does this code print?
   let score = 7;
   score = score + 9;
   score = score - 5;
   console.log(score);
6. 6.⚡ What number does this code print?
   let a = 10;
   let b = 3;
   console.log(a + b);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
8. 8.⚡ What number does this code print?
   let runs = 16;
   runs = runs + 4;
   runs = runs - 18;
   console.log(runs);
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
10. 10.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
11. 11.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
12. 12.⚡ What number does this code print?
    let a = 24;
    let b = 5;
    console.log(a - b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
15. 15.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
17. 17.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) alert()
18. 18.⚡ What number does this code print?
    let books = 30;
    books = books + 13;
    books = books - 17;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let score = 17;
    score = score + 11;
    score = score - 12;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
23. 23.⚡ What number does this code print?
    let score = 30;
    score = score + 12;
    score = score - 13;
    console.log(score);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
25. 25.⚡ What number does this code print?
    let score = 28;
    score = score + 20;
    score = score - 37;
    console.log(score);
26. 26.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
27. 27.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 3;
    apples = apples - 5;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let score = 14;
    score = score + 16;
    score = score - 22;
    console.log(score);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
31. 31.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 3;
    coins = coins - 2;
    console.log(coins);
32. 32.⚡ 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
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
35. 35.⚡ What number does this code print?
    let a = 34;
    let b = 7;
    console.log(a - b);
36. 36.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
40. 40.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);

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