JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 183 · 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 new tab (b) a pop-up box (c) a table (d) a picture
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
3. 3.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 3;
   coins = coins - 18;
   console.log(coins);
4. 4.⚡ What number does this code print?
   let apples = 26;
   apples = apples + 2;
   apples = apples - 22;
   console.log(apples);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) 11 (b) 29 (c) Error
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
7. 7.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) if
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) Error (b) 11 (c) 92
10. 10.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 14;
    coins = coins - 7;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 19;
    marks = marks - 8;
    console.log(marks);
12. 12.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 12 (c) 84
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
16. 16.⚡ What number does this code print?
    let books = 26;
    books = books + 11;
    books = books - 10;
    console.log(books);
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let score = 11;
    score = score + 6;
    score = score - 12;
    console.log(score);
19. 19.⚡ What number does this code print?
    let score = 29;
    score = score + 7;
    score = score - 13;
    console.log(score);
20. 20.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 15 (c) 78
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let score = 25;
    score = score + 2;
    score = score - 4;
    console.log(score);
24. 24.⚡ What number does this code print?
    let books = 17;
    books = books + 5;
    books = books - 5;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) 6 (c) Error
29. 29.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
32. 32.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 11;
    marks = marks - 18;
    console.log(marks);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 29;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
36. 36.⚡ What number does this code print?
    let score = 27;
    score = score + 18;
    score = score - 37;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 16;
    let b = 20;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) Error (c) 89
39. 39.⚡ What number does this code print?
    let books = 10;
    books = books + 12;
    books = books - 9;
    console.log(books);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error

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