JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 494 · 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 = "9";
   let y = 2;
   console.log(x + y); (a) Error (b) 92 (c) 11
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) 83 (b) Error (c) 11
3. 3.⚡ What number does this code print?
   let score = 8;
   score = score + 7;
   score = score - 1;
   console.log(score);
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) 6 (b) Error (c) 24
6. 6.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) Error (c) 64
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) for (d) alert()
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 36;
   console.log(a - b);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) Well done, name! (d) name
11. 11.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) 4 (c) Error
13. 13.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) console.log() (d) let
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
15. 15.⚡ What number does this code print?
    let a = 53;
    let b = 39;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) Error (c) 10
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
18. 18.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 6;
    runs = runs - 7;
    console.log(runs);
19. 19.⚡ What number does this code print?
    let a = 56;
    let b = 30;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 8 (c) 62
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 12 (c) 93
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
23. 23.⚡ What number does this code print?
    let a = 36;
    let b = 28;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 45;
    let b = 8;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 52;
    let b = 28;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) 8 (c) Error
27. 27.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 4;
    coins = coins - 10;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 13;
    runs = runs - 14;
    console.log(runs);
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) name (d) Well done, name!
30. 30.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 13;
    runs = runs - 26;
    console.log(runs);
31. 31.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
32. 32.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 19;
    coins = coins - 26;
    console.log(coins);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
35. 35.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
36. 36.⚡ What number does this code print?
    let score = 10;
    score = score + 16;
    score = score - 3;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Welcome, name! (d) Kabir
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
39. 39.⚡ What number does this code print?
    let score = 19;
    score = score + 7;
    score = score - 21;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);

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