JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 596 · 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 score = 22;
   score = score + 8;
   score = score - 20;
   console.log(score);
2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
4. 4.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) let (c) alert() (d) console.log()
6. 6.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) alert()
7. 7.⚡ What number does this code print?
   let a = 41;
   let b = 1;
   console.log(a + b);
8. 8.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
10. 10.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
11. 11.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
13. 13.⚡ What number does this code print?
    let a = 39;
    let b = 30;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) 42 (c) Error
19. 19.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 20;
    marks = marks - 37;
    console.log(marks);
20. 20.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
21. 21.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) alert()
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Meera! (c) Meera (d) name
23. 23.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 13;
    apples = apples - 2;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let a = 16;
    let b = 9;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 33;
    let b = 2;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
28. 28.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 2;
    apples = apples - 2;
    console.log(apples);
29. 29.⚡ What number does this code print?
    let a = 28;
    let b = 5;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
31. 31.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 2;
    apples = apples - 17;
    console.log(apples);
33. 33.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 10 (c) 28
35. 35.⚡ What number does this code print?
    let books = 29;
    books = books + 12;
    books = books - 18;
    console.log(books);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Arjun (d) Hello, name!
37. 37.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let score = 12;
    score = score + 9;
    score = score - 1;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 40;
    let b = 5;
    console.log(a - b);

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