JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 468 · 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 apples = 18;
   apples = apples + 2;
   apples = apples - 9;
   console.log(apples);
2. 2.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 6;
   console.log(x + y); (a) 11 (b) Error (c) 56
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
7. 7.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
8. 8.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 7;
   console.log(x + y); (a) Error (b) 47 (c) 11
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 52 (c) 7
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) if (d) for
12. 12.⚡ What number does this code print?
    let a = 39;
    let b = 33;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 54;
    let b = 33;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 58;
    let b = 22;
    console.log(a - b);
15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
16. 16.⚡ What number does this code print?
    let books = 6;
    books = books + 16;
    books = books - 13;
    console.log(books);
17. 17.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) Error (c) 13
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
20. 20.⚡ What number does this code print?
    let a = 23;
    let b = 6;
    console.log(a - b);
21. 21.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) if (d) console.log()
22. 22.⚡ What number does this code print?
    let books = 7;
    books = books + 16;
    books = books - 8;
    console.log(books);
23. 23.⚡ What number does this code print?
    let a = 40;
    let b = 37;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Riya (d) Hi, name!
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
27. 27.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) Aman (d) name
32. 32.⚡ What number does this code print?
    let a = 48;
    let b = 37;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 40;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 7;
    apples = apples - 4;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 9;
    runs = runs - 6;
    console.log(runs);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
37. 37.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let score = 18;
    score = score + 19;
    score = score - 17;
    console.log(score);
39. 39.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 12;
    coins = coins - 31;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) Hi, Arjun! (d) name

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