JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 608 · 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.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) Kabir (d) name
3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
4. 4.⚡ What number does this code print?
   let a = 15;
   let b = 4;
   console.log(a + b);
5. 5.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
6. 6.⚡ What number does this code print?
   let runs = 15;
   runs = runs + 7;
   runs = runs - 10;
   console.log(runs);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) Error (b) 46 (c) 10
8. 8.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
11. 11.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
12. 12.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
14. 14.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 9;
    runs = runs - 6;
    console.log(runs);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) if
16. 16.⚡ What number does this code print?
    let score = 11;
    score = score + 8;
    score = score - 10;
    console.log(score);
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
19. 19.⚡ 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
20. 20.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 54;
    let b = 34;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 28;
    let b = 27;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
25. 25.⚡ What number does this code print?
    let score = 25;
    score = score + 20;
    score = score - 41;
    console.log(score);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) name (d) Well done, name!
27. 27.⚡ What number does this code print?
    let books = 24;
    books = books + 8;
    books = books - 10;
    console.log(books);
28. 28.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 9;
    runs = runs - 9;
    console.log(runs);
29. 29.⚡ What number does this code print?
    let a = 33;
    let b = 24;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 33;
    let b = 14;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
32. 32.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
33. 33.⚡ What number does this code print?
    let a = 29;
    let b = 26;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
36. 36.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
37. 37.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 33;
    let b = 2;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 28;
    console.log(a + b);

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