JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 531 · 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 = 25;
   let b = 19;
   console.log(a + b);
2. 2.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
3. 3.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) let
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) let (d) alert()
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
6. 6.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
7. 7.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
8. 8.⚡ What number does this code print?
   let a = 8;
   let b = 8;
   console.log(a * b);
9. 9.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) for
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
13. 13.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let a = 17;
    let b = 14;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
16. 16.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) alert()
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) 86 (c) Error
20. 20.⚡ What number does this code print?
    let a = 53;
    let b = 37;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 12;
    coins = coins - 6;
    console.log(coins);
22. 22.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
23. 23.⚡ What number does this code print?
    let a = 40;
    let b = 38;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 30;
    let b = 37;
    console.log(a + b);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 17 (c) 98
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a * b);
28. 28.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
29. 29.⚡ What number does this code print?
    let a = 19;
    let b = 11;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) 47 (c) Error
31. 31.⚡ What number does this code print?
    let books = 7;
    books = books + 9;
    books = books - 13;
    console.log(books);
32. 32.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
33. 33.⚡ What number does this code print?
    let a = 44;
    let b = 35;
    console.log(a - b);
34. 34.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
35. 35.⚡ 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
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, Kabir! (d) Well done, name!
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
38. 38.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 16;
    runs = runs - 8;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 76 (c) 13

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