JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 127 · 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) console.log() (b) let (c) if (d) alert()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) Error (b) 57 (c) 12
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
4. 4.⚡ What number does this code print?
   let score = 22;
   score = score + 18;
   score = score - 19;
   console.log(score);
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
6. 6.⚡ What number does this code print?
   let a = 10;
   let b = 4;
   console.log(a * b);
7. 7.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) let (d) for
8. 8.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 16;
   coins = coins - 37;
   console.log(coins);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) name (d) Zoya
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
11. 11.⚡ What number does this code print?
    let a = 16;
    let b = 35;
    console.log(a + b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
15. 15.⚡ What number does this code print?
    let score = 12;
    score = score + 4;
    score = score - 1;
    console.log(score);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) 14 (c) Error
21. 21.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) for
22. 22.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 7;
    runs = runs - 1;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let a = 25;
    let b = 36;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
25. 25.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) Error (c) 17
28. 28.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, Meera! (d) Well done, name!
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
31. 31.⚡ What number does this code print?
    let a = 38;
    let b = 27;
    console.log(a - b);
32. 32.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) if
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 9 (c) 63
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) Error (c) 14
35. 35.⚡ What number does this code print?
    let score = 9;
    score = score + 14;
    score = score - 3;
    console.log(score);
36. 36.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) 8 (c) Error
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
39. 39.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error

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