JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 320 · 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 shows a pop-up box? (a) for (b) console.log() (c) alert() (d) if
2. 2.⚡ What number does this code print?
   let coins = 24;
   coins = coins + 7;
   coins = coins - 15;
   console.log(coins);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) Error (b) 66 (c) 12
4. 4.⚡ What number does this code print?
   let a = 22;
   let b = 16;
   console.log(a - b);
5. 5.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
6. 6.⚡ What number does this code print?
   let a = 47;
   let b = 22;
   console.log(a - b);
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) if (d) let
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
9. 9.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) let (d) console.log()
10. 10.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 19;
    apples = apples - 6;
    console.log(apples);
11. 11.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) alert()
12. 12.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
13. 13.⚡ What number does this code print?
    let a = 10;
    let b = 16;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 21;
    let b = 13;
    console.log(a - b);
15. 15.⚡ Which JavaScript word repeats code? (a) let (b) if (c) alert() (d) for
16. 16.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
18. 18.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, Riya! (d) Welcome, name!
20. 20.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 3;
    apples = apples - 2;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
24. 24.⚡ What number does this code print?
    let a = 18;
    let b = 36;
    console.log(a + b);
25. 25.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
26. 26.⚡ What number does this code print?
    let a = 39;
    let b = 16;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, Zoya! (d) Hi, name!
29. 29.⚡ What number does this code print?
    let a = 28;
    let b = 17;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 8;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
34. 34.⚡ What number does this code print?
    let books = 23;
    books = books + 13;
    books = books - 12;
    console.log(books);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
37. 37.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 8;
    marks = marks - 16;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 3;
    coins = coins - 9;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!

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