JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 558 · 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 number does this code print?
   let a = 29;
   let b = 36;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let coins = 24;
   coins = coins + 8;
   coins = coins - 7;
   console.log(coins);
3. 3.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) for
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
6. 6.⚡ What number does this code print?
   let runs = 9;
   runs = runs + 9;
   runs = runs - 3;
   console.log(runs);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 32 (b) Error (c) 5
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) name (d) Kabir
9. 9.⚡ What number does this code print?
   let score = 6;
   score = score + 8;
   score = score - 1;
   console.log(score);
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
11. 11.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
12. 12.⚡ What number does this code print?
    let a = 48;
    let b = 19;
    console.log(a + b);
13. 13.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) for
14. 14.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) Error (c) 12
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
17. 17.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
19. 19.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 12;
    runs = runs - 30;
    console.log(runs);
20. 20.⚡ What number does this code print?
    let a = 40;
    let b = 40;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 16;
    runs = runs - 21;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let a = 19;
    let b = 12;
    console.log(a - b);
24. 24.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
26. 26.⚡ What number does this code print?
    let a = 9;
    let b = 26;
    console.log(a + b);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
28. 28.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
29. 29.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 14;
    runs = runs - 3;
    console.log(runs);
30. 30.⚡ What number does this code print?
    let score = 20;
    score = score + 11;
    score = score - 22;
    console.log(score);
31. 31.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 14;
    coins = coins - 25;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 78 (c) 15
33. 33.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
38. 38.⚡ What number does this code print?
    let score = 19;
    score = score + 5;
    score = score - 4;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 46;
    let b = 5;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 20;
    runs = runs - 17;
    console.log(runs);

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