JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 906 · 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.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
2. 2.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
3. 3.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
4. 4.⚡ What number does this code print?
   let a = 23;
   let b = 11;
   console.log(a + b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 4;
   console.log(x + y); (a) Error (b) 34 (c) 7
6. 6.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
7. 7.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
8. 8.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
9. 9.⚡ What number does this code print?
   let runs = 25;
   runs = runs + 4;
   runs = runs - 29;
   console.log(runs);
10. 10.⚡ What number does this code print?
    let a = 16;
    let b = 36;
    console.log(a + b);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
13. 13.⚡ 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
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
16. 16.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 20;
    apples = apples - 36;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let score = 12;
    score = score + 2;
    score = score - 4;
    console.log(score);
18. 18.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 50;
    let b = 6;
    console.log(a + b);
20. 20.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
23. 23.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 11;
    runs = runs - 24;
    console.log(runs);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Arjun! (d) Arjun
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
26. 26.⚡ What number does this code print?
    let a = 58;
    let b = 34;
    console.log(a - b);
27. 27.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) let
28. 28.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 16;
    apples = apples - 4;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 18;
    marks = marks - 20;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let books = 9;
    books = books + 9;
    books = books - 4;
    console.log(books);
33. 33.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 5;
    marks = marks - 5;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let a = 24;
    let b = 21;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
36. 36.⚡ What number does this code print?
    let score = 30;
    score = score + 2;
    score = score - 26;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 26;
    let b = 7;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 14;
    runs = runs - 27;
    console.log(runs);
39. 39.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
40. 40.⚡ What number does this code print?
    let a = 21;
    let b = 4;
    console.log(a - b);

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