← JavaScript basics lesson New set →

JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 145 · 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 number does this code print?
    let a = 37;
    let b = 13;
    console.log(a - b);
  2. 2.⚡ What number does this code print?
    let a = 7;
    let b = 27;
    console.log(a + b);
  3. 3.⚡ What number does this code print?
    let a = 40;
    let b = 23;
    console.log(a + b);
  4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) if
  5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
  6. 6.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
  7. 7.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
  8. 8.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
  9. 9.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 15;
    coins = coins - 28;
    console.log(coins);
  10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
  11. 11.⚡ What number does this code print?
    let score = 28;
    score = score + 11;
    score = score - 20;
    console.log(score);
  12. 12.⚡ What number does this code print?
    let a = 8;
    let b = 14;
    console.log(a + b);
  13. 13.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 20;
    apples = apples - 11;
    console.log(apples);
  14. 14.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 5;
    runs = runs - 12;
    console.log(runs);
  15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y);     (a) Error (b) 3 (c) 12
  17. 17.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 17;
    coins = coins - 6;
    console.log(coins);
  18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) name (b) Kabir (c) Well done, name! (d) Well done, Kabir!
  19. 19.⚡ What number does this code print?
    let a = 51;
    let b = 35;
    console.log(a - b);
  20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
  21. 21.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
  22. 22.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
  23. 23.⚡ What number does this code print?
    let a = 48;
    let b = 14;
    console.log(a + b);
  24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
  25. 25.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 11;
    console.log(score);
  26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
  27. 27.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
  28. 28.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
  29. 29.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 20;
    apples = apples - 37;
    console.log(apples);
  30. 30.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 19;
    marks = marks - 43;
    console.log(marks);
  31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!");     (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
  32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
  33. 33.⚡ What number does this code print?
    let a = 30;
    let b = 14;
    console.log(a - b);
  34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
  35. 35.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 2;
    apples = apples - 6;
    console.log(apples);
  36. 36.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
  37. 37.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 17;
    apples = apples - 1;
    console.log(apples);
  38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
  39. 39.⚡ What number does this code print?
    let score = 23;
    score = score + 12;
    score = score - 6;
    console.log(score);
  40. 40.⚡ What number does this code print?
    let a = 54;
    let b = 30;
    console.log(a + b);

Answer key

  1. 24
  2. 34
  3. 63
  4. console.log()
  5. if
  6. in the console
  7. .js
  8. a pop-up box
  9. 3
  10. 14
  11. 19
  12. 22
  13. 39
  14. 23
  15. Well done, Meera!
  16. 12
  17. 34
  18. Well done, Kabir!
  19. 16
  20. Well done, Riya!
  21. <script>
  22. let
  23. 62
  24. Hello, Arjun!
  25. 12
  26. 33
  27. let
  28. actions and changes
  29. 10
  30. 4
  31. Welcome, Zoya!
  32. Well done, Zoya!
  33. 16
  34. Welcome, Kabir!
  35. 26
  36. alert()
  37. 33
  38. Hello, Riya!
  39. 29
  40. 84

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