← JavaScript basics lesson New set →

JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 896 · 40 questions
TalentJR

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".

NameDateTime takenScore ___ / 40
  1. 1.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Well done, Kabir! (d) Kabir
  2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
  3. 3.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
  4. 4.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
  5. 5.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
  6. 6.⚡ What number does this code print?
    let score = 20;
    score = score + 4;
    score = score - 7;
    console.log(score);
  7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
  8. 8.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) name (b) Meera (c) Hello, name! (d) Hello, Meera!
  9. 9.⚡ What number does this code print?
    let a = 18;
    let b = 2;
    console.log(a - b);
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y);     (a) 54 (b) 9 (c) Error
  11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
  12. 12.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
  13. 13.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 11;
    runs = runs - 10;
    console.log(runs);
  14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!");     (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
  15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
  16. 16.⚡ What number does this code print?
    let score = 14;
    score = score + 13;
    score = score - 12;
    console.log(score);
  17. 17.⚡ What number does this code print?
    let a = 51;
    let b = 10;
    console.log(a + b);
  18. 18.⚡ What number does this code print?
    let a = 20;
    let b = 15;
    console.log(a - b);
  19. 19.⚡ 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
  20. 20.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
  21. 21.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
  22. 22.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
  23. 23.⚡ What number does this code print?
    let a = 59;
    let b = 20;
    console.log(a - b);
  24. 24.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 19;
    console.log(score);
  25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y);     (a) Error (b) 55 (c) 10
  26. 26.⚡ What number does this code print?
    let books = 30;
    books = books + 5;
    books = books - 7;
    console.log(books);
  27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
  28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 28;
    console.log(a + b);
  29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
  30. 30.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
  31. 31.⚡ What number does this code print?
    let a = 16;
    let b = 38;
    console.log(a + b);
  32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
  33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y);     (a) 21 (b) Error (c) 3
  34. 34.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 17;
    coins = coins - 7;
    console.log(coins);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y);     (a) 17 (b) 98 (c) Error
  36. 36.⚡ What number does this code print?
    let a = 40;
    let b = 11;
    console.log(a + b);
  37. 37.⚡ What number does this code print?
    let a = 17;
    let b = 15;
    console.log(a - b);
  38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
  39. 39.⚡ What number does this code print?
    let score = 8;
    score = score + 14;
    score = score - 12;
    console.log(score);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y);     (a) Error (b) 69 (c) 15

Answer key

  1. Well done, Kabir!
  2. console.log()
  3. actions and changes
  4. let
  5. Well done, Arjun!
  6. 17
  7. alert()
  8. Hello, Meera!
  9. 16
  10. 54
  11. Hello, Arjun!
  12. Well done, Zoya!
  13. 30
  14. Welcome, Zoya!
  15. let
  16. 15
  17. 61
  18. 5
  19. 53
  20. in the console
  21. for
  22. .js
  23. 39
  24. 3
  25. 55
  26. 28
  27. Well done, Meera!
  28. 37
  29. 90
  30. a pop-up box
  31. 54
  32. Hello, Arjun!
  33. 21
  34. 18
  35. 98
  36. 51
  37. 2
  38. 63
  39. 10
  40. 69

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