JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 355 · 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 tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
2. 2.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 6;
   apples = apples - 3;
   console.log(apples);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 48 (b) Error (c) 12
4. 4.⚡ What number does this code print?
   let score = 29;
   score = score + 17;
   score = score - 36;
   console.log(score);
5. 5.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
6. 6.⚡ What number does this code print?
   let a = 60;
   let b = 11;
   console.log(a + b);
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) if
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
9. 9.⚡ What number does this code print?
   let books = 29;
   books = books + 8;
   books = books - 12;
   console.log(books);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
11. 11.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
12. 12.⚡ What number does this code print?
    let a = 18;
    let b = 3;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 5;
    marks = marks - 1;
    console.log(marks);
14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
16. 16.⚡ What number does this code print?
    let score = 21;
    score = score + 7;
    score = score - 24;
    console.log(score);
17. 17.⚡ What number does this code print?
    let a = 14;
    let b = 26;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 8;
    runs = runs - 22;
    console.log(runs);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) 14 (c) Error
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) 9 (c) Error
21. 21.⚡ What number does this code print?
    let score = 17;
    score = score + 2;
    score = score - 12;
    console.log(score);
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
23. 23.⚡ What number does this code print?
    let a = 36;
    let b = 7;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
26. 26.⚡ What number does this code print?
    let a = 57;
    let b = 21;
    console.log(a - b);
27. 27.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
29. 29.⚡ What number does this code print?
    let books = 14;
    books = books + 13;
    books = books - 11;
    console.log(books);
30. 30.⚡ What number does this code print?
    let a = 50;
    let b = 24;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 51;
    let b = 21;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 6;
    marks = marks - 11;
    console.log(marks);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
34. 34.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) alert()
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
36. 36.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
38. 38.⚡ What number does this code print?
    let books = 14;
    books = books + 14;
    books = books - 22;
    console.log(books);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
40. 40.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 12;
    marks = marks - 13;
    console.log(marks);

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