JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 666 · 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 does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
2. 2.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
5. 5.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
6. 6.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) Error (b) 91 (c) 10
8. 8.⚡ What number does this code print?
   let a = 14;
   let b = 20;
   console.log(a + b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) if (d) alert()
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) 95 (c) Error
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
12. 12.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 8;
    apples = apples - 13;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
14. 14.⚡ What number does this code print?
    let a = 33;
    let b = 20;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 20;
    runs = runs - 29;
    console.log(runs);
16. 16.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
17. 17.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 9;
    apples = apples - 17;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 33;
    let b = 6;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 35;
    let b = 18;
    console.log(a - b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
22. 22.⚡ What number does this code print?
    let books = 30;
    books = books + 10;
    books = books - 5;
    console.log(books);
23. 23.⚡ 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
24. 24.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
26. 26.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 7;
    apples = apples - 16;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
29. 29.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 3;
    marks = marks - 6;
    console.log(marks);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
34. 34.⚡ What number does this code print?
    let a = 51;
    let b = 2;
    console.log(a - b);
35. 35.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
36. 36.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) let (d) console.log()
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
40. 40.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 15;
    apples = apples - 3;
    console.log(apples);

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