← JavaScript basics lesson New set →

JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 444 · 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.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) alert()
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y);     (a) Error (b) 39 (c) 12
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) 10 (b) 82 (c) Error
  4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) let (d) alert()
  5. 5.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 8;
    marks = marks - 4;
    console.log(marks);
  6. 6.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
  7. 7.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
  8. 8.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
  9. 9.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
  10. 10.⚡ What number does this code print?
    let a = 13;
    let b = 9;
    console.log(a - b);
  11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y);     (a) 15 (b) 87 (c) Error
  12. 12.⚡ Which JavaScript word repeats code? (a) let (b) if (c) alert() (d) for
  13. 13.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
  14. 14.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) for
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y);     (a) 61 (b) Error (c) 7
  16. 16.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
  17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
  18. 18.⚡ What number does this code print?
    let a = 24;
    let b = 9;
    console.log(a + b);
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y);     (a) 92 (b) Error (c) 11
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 32 (b) 5 (c) Error
  21. 21.⚡ What number does this code print?
    let a = 17;
    let b = 17;
    console.log(a - b);
  22. 22.⚡ What number does this code print?
    let a = 28;
    let b = 27;
    console.log(a + b);
  23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!");     (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
  24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y);     (a) 4 (b) 13 (c) Error
  25. 25.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 18;
    apples = apples - 6;
    console.log(apples);
  26. 26.⚡ What number does this code print?
    let books = 18;
    books = books + 8;
    books = books - 1;
    console.log(books);
  27. 27.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 17;
    apples = apples - 7;
    console.log(apples);
  28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y);     (a) Error (b) 76 (c) 13
  29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
  30. 30.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
  31. 31.⚡ What number does this code print?
    let score = 10;
    score = score + 11;
    score = score - 20;
    console.log(score);
  32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a - b);
  33. 33.⚡ What number does this code print?
    let a = 22;
    let b = 6;
    console.log(a - b);
  34. 34.⚡ 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
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y);     (a) Error (b) 31 (c) 4
  36. 36.⚡ What number does this code print?
    let a = 14;
    let b = 5;
    console.log(a + b);
  37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!");     (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
  38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!");     (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
  39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
  40. 40.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) alert() (d) if

Answer key

  1. console.log()
  2. 39
  3. 82
  4. alert()
  5. 16
  6. Hello, Meera!
  7. .js
  8. actions and changes
  9. a pop-up box
  10. 4
  11. 87
  12. for
  13. 8
  14. let
  15. 61
  16. in the console
  17. 18
  18. 33
  19. 92
  20. 32
  21. 0
  22. 55
  23. Welcome, Kabir!
  24. 13
  25. 40
  26. 25
  27. 16
  28. 76
  29. Hello, Zoya!
  30. let
  31. 1
  32. 6
  33. 16
  34. 62
  35. 31
  36. 19
  37. Welcome, Zoya!
  38. Hi, Kabir!
  39. Well done, Riya!
  40. if

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