JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 823 · 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 = 41;
   let b = 31;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 17;
   let b = 39;
   console.log(a + b);
3. 3.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) for
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
5. 5.⚡ What number does this code print?
   let a = 44;
   let b = 36;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 30;
   console.log(a + b);
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
8. 8.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
9. 9.⚡ What number does this code print?
   let a = 39;
   let b = 19;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let books = 14;
    books = books + 18;
    books = books - 32;
    console.log(books);
11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
12. 12.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
13. 13.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
14. 14.⚡ What number does this code print?
    let score = 19;
    score = score + 2;
    score = score - 13;
    console.log(score);
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
18. 18.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) alert()
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
21. 21.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
22. 22.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
23. 23.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
24. 24.⚡ What number does this code print?
    let a = 28;
    let b = 19;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 54;
    let b = 7;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) Well done, Meera! (d) name
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
35. 35.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 4;
    runs = runs - 4;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 39;
    let b = 14;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 12 (c) 66
40. 40.⚡ What number does this code print?
    let a = 15;
    let b = 11;
    console.log(a - b);

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