JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 496 · 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 = 4;
   let b = 8;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let apples = 21;
   apples = apples + 11;
   apples = apples - 28;
   console.log(apples);
3. 3.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
6. 6.⚡ What number does this code print?
   let a = 44;
   let b = 38;
   console.log(a - b);
7. 7.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 3;
   console.log(x + y); (a) Error (b) 73 (c) 10
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Meera (d) Hello, name!
11. 11.⚡ What number does this code print?
    let a = 49;
    let b = 27;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 51;
    let b = 4;
    console.log(a - b);
13. 13.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
14. 14.⚡ What number does this code print?
    let score = 7;
    score = score + 7;
    score = score - 9;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 36;
    let b = 15;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
18. 18.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
20. 20.⚡ What number does this code print?
    let a = 45;
    let b = 12;
    console.log(a - b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
25. 25.⚡ What number does this code print?
    let books = 5;
    books = books + 18;
    books = books - 22;
    console.log(books);
26. 26.⚡ What number does this code print?
    let score = 9;
    score = score + 11;
    score = score - 4;
    console.log(score);
27. 27.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 16;
    coins = coins - 4;
    console.log(coins);
28. 28.⚡ 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
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) Error (c) 48
30. 30.⚡ What number does this code print?
    let a = 26;
    let b = 11;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 26;
    let b = 4;
    console.log(a - b);
33. 33.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
34. 34.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) 13 (c) Error
36. 36.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 11;
    apples = apples - 1;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 14 (c) 95
38. 38.⚡ What number does this code print?
    let a = 59;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) name (d) Well done, name!

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