JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 474 · 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.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) console.log() (d) alert()
2. 2.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
4. 4.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
6. 6.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 1;
   console.log(x + y); (a) 41 (b) 5 (c) Error
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) for (d) if
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
10. 10.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
11. 11.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
13. 13.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) alert()
14. 14.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
17. 17.⚡ What number does this code print?
    let score = 6;
    score = score + 6;
    score = score - 8;
    console.log(score);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 14 (c) 86
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
21. 21.⚡ What number does this code print?
    let a = 18;
    let b = 12;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
24. 24.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) 11 (c) Error
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
27. 27.⚡ What number does this code print?
    let books = 18;
    books = books + 16;
    books = books - 23;
    console.log(books);
28. 28.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
29. 29.⚡ What number does this code print?
    let a = 40;
    let b = 17;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) Aman (d) name
31. 31.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 13;
    coins = coins - 36;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 40;
    let b = 6;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 19;
    marks = marks - 36;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let score = 20;
    score = score + 13;
    score = score - 3;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 12 (c) 84
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, Zoya! (d) Welcome, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 26 (c) 8
39. 39.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 35;
    console.log(a + b);

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