JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 911 · 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 number does this code print?
   let a = 9;
   let b = 9;
   console.log(a * b);
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
3. 3.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
5. 5.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) 13 (b) 67 (c) Error
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
8. 8.⚡ 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
9. 9.⚡ What number does this code print?
   let a = 45;
   let b = 10;
   console.log(a + b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) for
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
12. 12.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
14. 14.⚡ What number does this code print?
    let a = 55;
    let b = 20;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 6;
    let b = 24;
    console.log(a + b);
16. 16.⚡ 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
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
21. 21.⚡ What number does this code print?
    let a = 56;
    let b = 9;
    console.log(a + b);
22. 22.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) for
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
24. 24.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
26. 26.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 5;
    runs = runs - 5;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 45;
    let b = 16;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let books = 29;
    books = books + 4;
    books = books - 22;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 51;
    let b = 11;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 58;
    let b = 11;
    console.log(a + b);
32. 32.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
33. 33.⚡ What number does this code print?
    let a = 60;
    let b = 10;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 9;
    apples = apples - 9;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 7;
    marks = marks - 4;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 12;
    marks = marks - 16;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 13;
    marks = marks - 1;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 52;
    let b = 26;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 13;
    console.log(a - b);

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