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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 348 · 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 alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y);     (a) 14 (b) Error (c) 95
  3. 3.⚡ What number does this code print?
    let a = 49;
    let b = 34;
    console.log(a + b);
  4. 4.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 9;
    marks = marks - 4;
    console.log(marks);
  5. 5.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) let
  6. 6.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) name (b) Well done, Aman! (c) Aman (d) Well done, name!
  7. 7.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
  8. 8.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
  9. 9.⚡ What number does this code print?
    let score = 6;
    score = score + 6;
    score = score - 4;
    console.log(score);
  10. 10.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 14;
    apples = apples - 15;
    console.log(apples);
  11. 11.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
  12. 12.⚡ What number does this code print?
    let a = 24;
    let b = 18;
    console.log(a + b);
  13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) Well done, name! (c) name (d) Well done, Zoya!
  14. 14.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
  15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
  16. 16.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 2;
    marks = marks - 18;
    console.log(marks);
  17. 17.⚡ What number does this code print?
    let books = 6;
    books = books + 5;
    books = books - 10;
    console.log(books);
  18. 18.⚡ What number does this code print?
    let a = 10;
    let b = 28;
    console.log(a + b);
  19. 19.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
  20. 20.⚡ What number does this code print?
    let a = 13;
    let b = 18;
    console.log(a + b);
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y);     (a) Error (b) 7 (c) 34
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y);     (a) 11 (b) Error (c) 38
  23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
  24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
  25. 25.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y);     (a) 4 (b) 31 (c) Error
  27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
  28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
  29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 5 (b) Error (c) 32
  30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y);     (a) Error (b) 10 (c) 64
  31. 31.⚡ What number does this code print?
    let score = 7;
    score = score + 5;
    score = score - 4;
    console.log(score);
  32. 32.⚡ What number does this code print?
    let a = 32;
    let b = 36;
    console.log(a + b);
  33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y);     (a) 12 (b) Error (c) 93
  34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
  35. 35.⚡ What number does this code print?
    let a = 55;
    let b = 7;
    console.log(a + b);
  36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y);     (a) 2 (b) Error (c) 11
  38. 38.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) if
  39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
  40. 40.⚡ What number does this code print?
    let score = 25;
    score = score + 10;
    score = score - 1;
    console.log(score);

Answer key

  1. a pop-up box
  2. 95
  3. 83
  4. 22
  5. console.log()
  6. Well done, Aman!
  7. 55
  8. .js
  9. 8
  10. 8
  11. actions and changes
  12. 42
  13. Well done, Zoya!
  14. let
  15. <script>
  16. 8
  17. 1
  18. 38
  19. if
  20. 31
  21. 34
  22. 38
  23. 36
  24. Well done, Meera!
  25. in the console
  26. 31
  27. 48
  28. Welcome, Kabir!
  29. 32
  30. 64
  31. 8
  32. 68
  33. 93
  34. Well done, Riya!
  35. 62
  36. Welcome, Meera!
  37. 11
  38. for
  39. Hello, Kabir!
  40. 34

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