JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 486 · 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 = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, Riya! (d) Hi, name!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 48 (b) Error (c) 12
3. 3.⚡ What number does this code print?
   let a = 36;
   let b = 7;
   console.log(a - b);
4. 4.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 2;
   console.log(a - b);
7. 7.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 19;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
12. 12.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 75 (c) 12
14. 14.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) Error (c) 9
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
19. 19.⚡ What number does this code print?
    let score = 12;
    score = score + 17;
    score = score - 7;
    console.log(score);
20. 20.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 4;
    apples = apples - 14;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 60;
    let b = 31;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
23. 23.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) alert()
24. 24.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) Error (c) 17
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let a = 39;
    let b = 8;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Zoya (d) Welcome, Zoya!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
30. 30.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
31. 31.⚡ What number does this code print?
    let score = 19;
    score = score + 4;
    score = score - 2;
    console.log(score);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 13 (c) 76
34. 34.⚡ What number does this code print?
    let books = 28;
    books = books + 2;
    books = books - 15;
    console.log(books);
35. 35.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
36. 36.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
37. 37.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 17;
    apples = apples - 26;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) Kabir (d) name
39. 39.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 8;
    marks = marks - 24;
    console.log(marks);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir

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