JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 508 · 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) <script> (b) <style> (c) <js> (d) <code>
2. 2.⚡ What number does this code print?
   let a = 42;
   let b = 19;
   console.log(a - b);
3. 3.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
4. 4.⚡ What number does this code print?
   let marks = 23;
   marks = marks + 9;
   marks = marks - 6;
   console.log(marks);
5. 5.⚡ What number does this code print?
   let apples = 16;
   apples = apples + 11;
   apples = apples - 6;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let a = 35;
   let b = 16;
   console.log(a + b);
7. 7.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
8. 8.⚡ What number does this code print?
   let a = 54;
   let b = 18;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
10. 10.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) alert() (d) let
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Riya! (d) Riya
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name
13. 13.⚡ What number does this code print?
    let a = 37;
    let b = 24;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Meera (d) Well done, Meera!
15. 15.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
19. 19.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 21;
    let b = 4;
    console.log(a - b);
21. 21.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) let (d) for
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 9 (c) 36
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) 8 (c) Error
24. 24.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 17;
    coins = coins - 9;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 16;
    apples = apples - 9;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 2;
    apples = apples - 8;
    console.log(apples);
27. 27.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
28. 28.⚡ What number does this code print?
    let a = 51;
    let b = 17;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 17;
    marks = marks - 3;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 3;
    marks = marks - 1;
    console.log(marks);
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
32. 32.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a - b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 83 (c) 11
34. 34.⚡ What number does this code print?
    let books = 30;
    books = books + 15;
    books = books - 5;
    console.log(books);
35. 35.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Zoya (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
39. 39.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 52;
    let b = 21;
    console.log(a + b);

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