JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 191 · 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 writes in the console? (a) if (b) console.log() (c) let (d) alert()
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) Hi, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 8;
   console.log(a * b);
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) 38 (b) Error (c) 11
6. 6.⚡ What number does this code print?
   let a = 9;
   let b = 8;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 55;
   let b = 3;
   console.log(a - b);
8. 8.⚡ What number does this code print?
   let a = 43;
   let b = 7;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let runs = 28;
   runs = runs + 3;
   runs = runs - 30;
   console.log(runs);
10. 10.⚡ What number does this code print?
    let a = 48;
    let b = 5;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) 13 (c) Error
12. 12.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 31;
    let b = 12;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let books = 28;
    books = books + 4;
    books = books - 27;
    console.log(books);
15. 15.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a + b);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
17. 17.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 1;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) Welcome, Zoya! (d) name
20. 20.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) let
21. 21.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
23. 23.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39
25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 68 (c) 14
28. 28.⚡ What number does this code print?
    let score = 14;
    score = score + 19;
    score = score - 11;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let books = 11;
    books = books + 13;
    books = books - 8;
    console.log(books);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
33. 33.⚡ What number does this code print?
    let a = 35;
    let b = 5;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 3;
    console.log(a + b);
37. 37.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) if (d) console.log()
38. 38.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 7;
    runs = runs - 21;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 24;
    let b = 21;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!

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