JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 946 · 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 number does this code print?
   let apples = 8;
   apples = apples + 5;
   apples = apples - 3;
   console.log(apples);
2. 2.⚡ What number does this code print?
   let a = 40;
   let b = 9;
   console.log(a - b);
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
4. 4.⚡ What number does this code print?
   let a = 5;
   let b = 3;
   console.log(a * b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) Error (b) 6 (c) 33
6. 6.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) alert()
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) Error (b) 12 (c) 75
8. 8.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) 26 (b) Error (c) 8
10. 10.⚡ What number does this code print?
    let a = 56;
    let b = 7;
    console.log(a + b);
11. 11.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) console.log()
13. 13.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 3;
    marks = marks - 9;
    console.log(marks);
14. 14.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) if
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) 6 (c) Error
18. 18.⚡ What number does this code print?
    let a = 48;
    let b = 21;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let score = 7;
    score = score + 17;
    score = score - 24;
    console.log(score);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
21. 21.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
25. 25.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
26. 26.⚡ What number does this code print?
    let a = 45;
    let b = 36;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
28. 28.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) 4 (c) Error
30. 30.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 57;
    let b = 33;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 47;
    let b = 18;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let books = 12;
    books = books + 6;
    books = books - 11;
    console.log(books);
36. 36.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 12;
    apples = apples - 18;
    console.log(apples);
37. 37.⚡ 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!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) 93 (c) Error
39. 39.⚡ What number does this code print?
    let a = 52;
    let b = 11;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error

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