JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 533 · 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 print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) Error (b) 5 (c) 23
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) 42 (b) 6 (c) Error
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
4. 4.⚡ 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
5. 5.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
6. 6.⚡ What number does this code print?
   let score = 26;
   score = score + 7;
   score = score - 4;
   console.log(score);
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
8. 8.⚡ What number does this code print?
   let score = 13;
   score = score + 15;
   score = score - 24;
   console.log(score);
9. 9.⚡ What number does this code print?
   let a = 21;
   let b = 8;
   console.log(a + b);
10. 10.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
12. 12.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
13. 13.⚡ What number does this code print?
    let score = 6;
    score = score + 8;
    score = score - 6;
    console.log(score);
14. 14.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) if (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 44;
    let b = 26;
    console.log(a + b);
16. 16.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
17. 17.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 18;
    runs = runs - 41;
    console.log(runs);
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 29;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) Hello, name! (d) name
20. 20.⚡ What number does this code print?
    let a = 25;
    let b = 5;
    console.log(a - b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Arjun (d) Welcome, Arjun!
23. 23.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
25. 25.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) alert()
26. 26.⚡ What number does this code print?
    let score = 10;
    score = score + 14;
    score = score - 10;
    console.log(score);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) Error (c) 16
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) 76 (c) Error
29. 29.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 13;
    marks = marks - 2;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let a = 39;
    let b = 1;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
32. 32.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 2;
    runs = runs - 9;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 46;
    let b = 11;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let score = 9;
    score = score + 10;
    score = score - 1;
    console.log(score);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 56;
    let b = 6;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 2;
    coins = coins - 8;
    console.log(coins);
40. 40.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids