JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 639 · 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) let (b) for (c) alert() (d) if
2. 2.⚡ What number does this code print?
   let a = 11;
   let b = 10;
   console.log(a + b);
3. 3.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) alert()
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
5. 5.⚡ What number does this code print?
   let apples = 26;
   apples = apples + 17;
   apples = apples - 15;
   console.log(apples);
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Riya! (d) Riya
7. 7.⚡ What number does this code print?
   let a = 3;
   let b = 10;
   console.log(a * b);
8. 8.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
9. 9.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
10. 10.⚡ What number does this code print?
    let a = 17;
    let b = 19;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
13. 13.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a + b);
14. 14.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
15. 15.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
16. 16.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 3;
    marks = marks - 26;
    console.log(marks);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
19. 19.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
20. 20.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
21. 21.⚡ What number does this code print?
    let a = 21;
    let b = 1;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
23. 23.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 11;
    coins = coins - 1;
    console.log(coins);
24. 24.⚡ 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
25. 25.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) for
26. 26.⚡ What number does this code print?
    let a = 38;
    let b = 20;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 32;
    let b = 13;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
29. 29.⚡ What number does this code print?
    let a = 47;
    let b = 10;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
31. 31.⚡ What number does this code print?
    let a = 17;
    let b = 9;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) Error (c) 88
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 54 (c) 9
37. 37.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
38. 38.⚡ What number does this code print?
    let books = 29;
    books = books + 18;
    books = books - 26;
    console.log(books);
39. 39.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 11;
    runs = runs - 14;
    console.log(runs);
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera

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