JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 667 · 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("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Aman (d) Well done, name!
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
3. 3.⚡ What number does this code print?
   let marks = 28;
   marks = marks + 6;
   marks = marks - 17;
   console.log(marks);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) Error (b) 28 (c) 10
5. 5.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 5;
   console.log(x + y); (a) 6 (b) 15 (c) Error
7. 7.⚡ What number does this code print?
   let a = 29;
   let b = 19;
   console.log(a - b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 9;
   console.log(x + y); (a) 49 (b) Error (c) 13
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) Welcome, Zoya! (d) name
11. 11.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 2;
    apples = apples - 5;
    console.log(apples);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
15. 15.⚡ What number does this code print?
    let a = 24;
    let b = 5;
    console.log(a - b);
16. 16.⚡ 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
17. 17.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) console.log() (d) for
18. 18.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) alert()
19. 19.⚡ 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
20. 20.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
22. 22.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 11;
    apples = apples - 1;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 7;
    console.log(a - b);
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
25. 25.⚡ What number does this code print?
    let a = 10;
    let b = 31;
    console.log(a + b);
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
28. 28.⚡ What number does this code print?
    let score = 24;
    score = score + 6;
    score = score - 27;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 37;
    let b = 2;
    console.log(a - b);
30. 30.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
31. 31.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 6;
    runs = runs - 2;
    console.log(runs);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
33. 33.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
35. 35.⚡ What number does this code print?
    let a = 25;
    let b = 10;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 31 (c) 4
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
38. 38.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 10;
    runs = runs - 25;
    console.log(runs);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
40. 40.⚡ What number does this code print?
    let books = 10;
    books = books + 2;
    books = books - 4;
    console.log(books);

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