JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 757 · 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) alert() (b) for (c) console.log() (d) let
2. 2.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) Error (b) 8 (c) 26
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Welcome, name! (d) Kabir
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
7. 7.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
8. 8.⚡ What number does this code print?
   let books = 23;
   books = books + 7;
   books = books - 8;
   console.log(books);
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
10. 10.⚡ What number does this code print?
    let books = 5;
    books = books + 4;
    books = books - 3;
    console.log(books);
11. 11.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 4;
    marks = marks - 11;
    console.log(marks);
12. 12.⚡ What number does this code print?
    let a = 33;
    let b = 10;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) 9 (c) Error
14. 14.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 16;
    coins = coins - 23;
    console.log(coins);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 64 (c) 10
16. 16.⚡ What number does this code print?
    let a = 16;
    let b = 39;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
19. 19.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
20. 20.⚡ What number does this code print?
    let a = 37;
    let b = 15;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
23. 23.⚡ What number does this code print?
    let books = 25;
    books = books + 13;
    books = books - 12;
    console.log(books);
24. 24.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 2;
    marks = marks - 9;
    console.log(marks);
25. 25.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) alert() (d) for
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) 45 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) 15 (c) Error
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 38;
    let b = 11;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 28;
    let b = 12;
    console.log(a - b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
33. 33.⚡ What number does this code print?
    let a = 14;
    let b = 10;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) Error (c) 6
35. 35.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) 94 (c) Error
37. 37.⚡ What number does this code print?
    let books = 10;
    books = books + 15;
    books = books - 14;
    console.log(books);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Meera (d) Welcome, Meera!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) Error (c) 11
40. 40.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let

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