JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 858 · 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 does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) for
3. 3.⚡ What number does this code print?
   let a = 22;
   let b = 7;
   console.log(a - b);
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
6. 6.⚡ What number does this code print?
   let books = 7;
   books = books + 11;
   books = books - 18;
   console.log(books);
7. 7.⚡ What number does this code print?
   let a = 6;
   let b = 2;
   console.log(a * b);
8. 8.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
9. 9.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
10. 10.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 18;
    coins = coins - 13;
    console.log(coins);
12. 12.⚡ What number does this code print?
    let score = 5;
    score = score + 16;
    score = score - 4;
    console.log(score);
13. 13.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 4;
    marks = marks - 12;
    console.log(marks);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
16. 16.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) console.log()
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
18. 18.⚡ What number does this code print?
    let a = 38;
    let b = 7;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
21. 21.⚡ What number does this code print?
    let a = 44;
    let b = 33;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
24. 24.⚡ What number does this code print?
    let a = 35;
    let b = 10;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
27. 27.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
28. 28.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
29. 29.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 42;
    let b = 24;
    console.log(a - b);
31. 31.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
32. 32.⚡ What number does this code print?
    let a = 40;
    let b = 24;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 17;
    coins = coins - 36;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let books = 6;
    books = books + 5;
    books = books - 9;
    console.log(books);
35. 35.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let books = 12;
    books = books + 2;
    books = books - 3;
    console.log(books);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
38. 38.⚡ What number does this code print?
    let books = 30;
    books = books + 13;
    books = books - 18;
    console.log(books);
39. 39.⚡ What number does this code print?
    let score = 13;
    score = score + 3;
    score = score - 6;
    console.log(score);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2

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