JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 50 · 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 coins = 27;
   coins = coins + 20;
   coins = coins - 10;
   console.log(coins);
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) 9 (b) 54 (c) Error
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 1;
   console.log(x + y); (a) 4 (b) Error (c) 31
6. 6.⚡ What number does this code print?
   let a = 4;
   let b = 8;
   console.log(a * b);
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) let
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 1;
   console.log(x + y); (a) 81 (b) 9 (c) Error
9. 9.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
10. 10.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
11. 11.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) for
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
15. 15.⚡ What number does this code print?
    let a = 48;
    let b = 7;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 6;
    apples = apples - 4;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Aman! (c) name (d) Aman
18. 18.⚡ 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
19. 19.⚡ What number does this code print?
    let score = 25;
    score = score + 11;
    score = score - 19;
    console.log(score);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) Error (b) 45 (c) 9
23. 23.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) alert()
24. 24.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 9;
    coins = coins - 18;
    console.log(coins);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Kabir! (c) Well done, name! (d) Kabir
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
27. 27.⚡ What number does this code print?
    let a = 33;
    let b = 8;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 36;
    let b = 17;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
30. 30.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 5;
    marks = marks - 2;
    console.log(marks);
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
32. 32.⚡ What number does this code print?
    let a = 51;
    let b = 8;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 11;
    marks = marks - 5;
    console.log(marks);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
35. 35.⚡ What number does this code print?
    let books = 27;
    books = books + 19;
    books = books - 1;
    console.log(books);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a - b);
38. 38.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 52;
    let b = 28;
    console.log(a + b);

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