JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 540 · 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.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 12 (b) Error (c) 75
4. 4.⚡ What number does this code print?
   let a = 10;
   let b = 6;
   console.log(a * b);
5. 5.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
6. 6.⚡ What number does this code print?
   let marks = 15;
   marks = marks + 14;
   marks = marks - 7;
   console.log(marks);
7. 7.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
10. 10.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 8;
    apples = apples - 22;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let a = 33;
    let b = 9;
    console.log(a - b);
12. 12.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) let
13. 13.⚡ What number does this code print?
    let a = 29;
    let b = 12;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
16. 16.⚡ What number does this code print?
    let a = 21;
    let b = 1;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 66 (c) 12
18. 18.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) for
19. 19.⚡ What number does this code print?
    let score = 11;
    score = score + 20;
    score = score - 8;
    console.log(score);
20. 20.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 6;
    marks = marks - 15;
    console.log(marks);
21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
22. 22.⚡ What number does this code print?
    let a = 37;
    let b = 9;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 30;
    let b = 21;
    console.log(a - b);
24. 24.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let books = 27;
    books = books + 8;
    books = books - 17;
    console.log(books);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, Zoya! (d) Welcome, name!
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
30. 30.⚡ What number does this code print?
    let a = 25;
    let b = 14;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 20;
    apples = apples - 29;
    console.log(apples);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
33. 33.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
34. 34.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 13;
    apples = apples - 30;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 20;
    marks = marks - 6;
    console.log(marks);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
37. 37.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 6;
    coins = coins - 4;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let books = 5;
    books = books + 13;
    books = books - 3;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);

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