JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 319 · 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 = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
2. 2.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
3. 3.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) Meera (d) name
6. 6.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
8. 8.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) 53 (b) Error (c) 8
10. 10.⚡ What number does this code print?
    let a = 22;
    let b = 16;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
13. 13.⚡ What number does this code print?
    let a = 26;
    let b = 13;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
15. 15.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
16. 16.⚡ What number does this code print?
    let a = 51;
    let b = 29;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) 6 (c) Error
20. 20.⚡ What number does this code print?
    let a = 14;
    let b = 26;
    console.log(a + b);
21. 21.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
23. 23.⚡ What number does this code print?
    let a = 48;
    let b = 9;
    console.log(a + b);
24. 24.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) alert()
25. 25.⚡ What number does this code print?
    let books = 11;
    books = books + 15;
    books = books - 9;
    console.log(books);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) 8 (c) Error
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) 84 (c) Error
29. 29.⚡ What number does this code print?
    let a = 32;
    let b = 9;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
33. 33.⚡ What number does this code print?
    let a = 41;
    let b = 13;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 18;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
39. 39.⚡ What number does this code print?
    let a = 26;
    let b = 21;
    console.log(a + b);
40. 40.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes

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