JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 734 · 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.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) Meera (d) name
3. 3.⚡ What number does this code print?
   let score = 5;
   score = score + 7;
   score = score - 1;
   console.log(score);
4. 4.⚡ What number does this code print?
   let a = 4;
   let b = 3;
   console.log(a * b);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) if
6. 6.⚡ What number does this code print?
   let score = 7;
   score = score + 5;
   score = score - 5;
   console.log(score);
7. 7.⚡ What number does this code print?
   let a = 16;
   let b = 16;
   console.log(a - b);
8. 8.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
9. 9.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) if
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
11. 11.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 17;
    coins = coins - 28;
    console.log(coins);
12. 12.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) if (d) for
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) Hello, name! (d) name
14. 14.⚡ What number does this code print?
    let a = 52;
    let b = 31;
    console.log(a - b);
15. 15.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
16. 16.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
17. 17.⚡ 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
18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
19. 19.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 8;
    marks = marks - 6;
    console.log(marks);
21. 21.⚡ What number does this code print?
    let score = 30;
    score = score + 12;
    score = score - 26;
    console.log(score);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
23. 23.⚡ What number does this code print?
    let a = 31;
    let b = 13;
    console.log(a - b);
24. 24.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
25. 25.⚡ What number does this code print?
    let a = 21;
    let b = 16;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 6;
    runs = runs - 30;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 31;
    let b = 18;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let books = 9;
    books = books + 16;
    books = books - 17;
    console.log(books);
30. 30.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
31. 31.⚡ What number does this code print?
    let a = 55;
    let b = 4;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) Error (c) 93
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
35. 35.⚡ What number does this code print?
    let a = 21;
    let b = 22;
    console.log(a + b);
36. 36.⚡ 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
37. 37.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 8;
    coins = coins - 18;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let books = 30;
    books = books + 15;
    books = books - 27;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 44;
    let b = 30;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6

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