JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 654 · 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 JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
2. 2.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 17 (b) 89 (c) Error
4. 4.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, name! (d) Well done, Kabir!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 8 (b) 71 (c) Error
7. 7.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
8. 8.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 4;
   console.log(x + y); (a) Error (b) 44 (c) 8
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) Error (c) 7
11. 11.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
13. 13.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
14. 14.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 5;
    apples = apples - 6;
    console.log(apples);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) for (d) if
16. 16.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
18. 18.⚡ What number does this code print?
    let a = 35;
    let b = 7;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 43;
    let b = 11;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let books = 16;
    books = books + 8;
    books = books - 5;
    console.log(books);
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 25;
    let b = 10;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 4;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 48;
    let b = 38;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let books = 10;
    books = books + 2;
    books = books - 3;
    console.log(books);
27. 27.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 14;
    coins = coins - 1;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let books = 6;
    books = books + 15;
    books = books - 15;
    console.log(books);
29. 29.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 12;
    runs = runs - 30;
    console.log(runs);
30. 30.⚡ What number does this code print?
    let a = 52;
    let b = 34;
    console.log(a + b);
31. 31.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) name (d) Zoya
33. 33.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) Error (c) 12
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, Riya! (d) Welcome, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
37. 37.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 4;
    marks = marks - 3;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let books = 19;
    books = books + 19;
    books = books - 11;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9

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