JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 380 · 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.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
2. 2.⚡ What number does this code print?
   let score = 9;
   score = score + 14;
   score = score - 9;
   console.log(score);
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
4. 4.⚡ What number does this code print?
   let a = 8;
   let b = 35;
   console.log(a + b);
5. 5.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 99 (b) Error (c) 18
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 64 (b) Error (c) 10
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
9. 9.⚡ What number does this code print?
   let coins = 27;
   coins = coins + 12;
   coins = coins - 31;
   console.log(coins);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Kabir (d) Well done, Kabir!
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
14. 14.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
15. 15.⚡ What number does this code print?
    let score = 28;
    score = score + 18;
    score = score - 29;
    console.log(score);
16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
18. 18.⚡ What number does this code print?
    let a = 16;
    let b = 1;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 40;
    let b = 14;
    console.log(a - b);
20. 20.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) if
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
22. 22.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
23. 23.⚡ What number does this code print?
    let a = 27;
    let b = 27;
    console.log(a - b);
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
25. 25.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a + b);
26. 26.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
27. 27.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 15;
    runs = runs - 8;
    console.log(runs);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
29. 29.⚡ What number does this code print?
    let books = 18;
    books = books + 2;
    books = books - 10;
    console.log(books);
30. 30.⚡ What number does this code print?
    let a = 16;
    let b = 32;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 32;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
38. 38.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 15;
    apples = apples - 33;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name

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