JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 653 · 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 a = 12;
   let b = 11;
   console.log(a - b);
2. 2.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
3. 3.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
5. 5.⚡ What number does this code print?
   let a = 35;
   let b = 17;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 10;
   let b = 1;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 2;
   console.log(a - b);
8. 8.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
9. 9.⚡ What number does this code print?
   let score = 20;
   score = score + 5;
   score = score - 2;
   console.log(score);
10. 10.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
11. 11.⚡ What number does this code print?
    let books = 20;
    books = books + 8;
    books = books - 21;
    console.log(books);
12. 12.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 8;
    runs = runs - 5;
    console.log(runs);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
15. 15.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
16. 16.⚡ What number does this code print?
    let books = 11;
    books = books + 12;
    books = books - 18;
    console.log(books);
17. 17.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 4;
    marks = marks - 24;
    console.log(marks);
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
19. 19.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 15;
    apples = apples - 11;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
21. 21.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
23. 23.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 16;
    runs = runs - 26;
    console.log(runs);
24. 24.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) Error (c) 9
26. 26.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
27. 27.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 17;
    apples = apples - 21;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) 9 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
32. 32.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 8;
    apples = apples - 19;
    console.log(apples);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
35. 35.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
36. 36.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!

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