JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 68 · 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 alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
2. 2.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) 14 (b) 59 (c) Error
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) 29 (b) 11 (c) Error
7. 7.⚡ 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!
8. 8.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) if
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 14 (b) Error (c) 5
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
12. 12.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
14. 14.⚡ What number does this code print?
    let score = 27;
    score = score + 9;
    score = score - 14;
    console.log(score);
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
16. 16.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
17. 17.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) for (d) alert()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
19. 19.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 20;
    coins = coins - 5;
    console.log(coins);
20. 20.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 7;
    coins = coins - 11;
    console.log(coins);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) 16 (c) Error
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
23. 23.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
24. 24.⚡ What number does this code print?
    let a = 59;
    let b = 40;
    console.log(a - b);
25. 25.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
26. 26.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 13;
    marks = marks - 18;
    console.log(marks);
27. 27.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
28. 28.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
29. 29.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
31. 31.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
32. 32.⚡ What number does this code print?
    let books = 7;
    books = books + 11;
    books = books - 16;
    console.log(books);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
34. 34.⚡ What number does this code print?
    let score = 27;
    score = score + 15;
    score = score - 21;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error
37. 37.⚡ What number does this code print?
    let books = 21;
    books = books + 16;
    books = books - 9;
    console.log(books);
38. 38.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 4;
    runs = runs - 10;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 37;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 54;
    let b = 16;
    console.log(a + b);

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