JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 33 · 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 JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 5;
   console.log(x + y); (a) Error (b) 11 (c) 65
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 2;
   console.log(x + y); (a) 9 (b) Error (c) 72
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) name (d) Zoya
5. 5.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
6. 6.⚡ What number does this code print?
   let a = 20;
   let b = 1;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
8. 8.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) let
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) 35 (b) Error (c) 8
10. 10.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) for
11. 11.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) console.log() (d) let
12. 12.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 3;
    coins = coins - 6;
    console.log(coins);
13. 13.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
15. 15.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
16. 16.⚡ What number does this code print?
    let a = 24;
    let b = 40;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let score = 29;
    score = score + 16;
    score = score - 2;
    console.log(score);
18. 18.⚡ What number does this code print?
    let a = 24;
    let b = 5;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Kabir! (d) Kabir
20. 20.⚡ What number does this code print?
    let a = 39;
    let b = 4;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 32;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 12 (c) 48
23. 23.⚡ What number does this code print?
    let a = 33;
    let b = 23;
    console.log(a - b);
24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
26. 26.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
27. 27.⚡ What number does this code print?
    let a = 58;
    let b = 5;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 20;
    coins = coins - 39;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 10;
    coins = coins - 20;
    console.log(coins);
32. 32.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 58;
    let b = 25;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let books = 23;
    books = books + 3;
    books = books - 6;
    console.log(books);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14
38. 38.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a + b);
39. 39.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error

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