JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 372 · 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.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
2. 2.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
3. 3.⚡ What number does this code print?
   let marks = 28;
   marks = marks + 17;
   marks = marks - 18;
   console.log(marks);
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
6. 6.⚡ What number does this code print?
   let apples = 18;
   apples = apples + 15;
   apples = apples - 8;
   console.log(apples);
7. 7.⚡ Which JavaScript word repeats code? (a) for (b) if (c) alert() (d) console.log()
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 4;
   console.log(x + y); (a) 34 (b) 7 (c) Error
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
12. 12.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
13. 13.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 15;
    runs = runs - 14;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 19;
    marks = marks - 20;
    console.log(marks);
15. 15.⚡ What number does this code print?
    let books = 8;
    books = books + 2;
    books = books - 3;
    console.log(books);
16. 16.⚡ What number does this code print?
    let a = 47;
    let b = 40;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) Error (c) 27
18. 18.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) alert()
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Well done, name! (d) Zoya
20. 20.⚡ What number does this code print?
    let a = 12;
    let b = 37;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
22. 22.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
23. 23.⚡ What number does this code print?
    let a = 56;
    let b = 12;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
26. 26.⚡ What number does this code print?
    let a = 16;
    let b = 13;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 11;
    coins = coins - 5;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 17;
    let b = 5;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 10;
    marks = marks - 26;
    console.log(marks);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) 84 (c) Error
32. 32.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) Error (c) 11
34. 34.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
35. 35.⚡ What number does this code print?
    let a = 40;
    let b = 26;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 6;
    coins = coins - 18;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 21;
    let b = 17;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 6;
    runs = runs - 19;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 19;
    coins = coins - 28;
    console.log(coins);

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