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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 491 · 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.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
  2. 2.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
  3. 3.⚡ What number does this code print?
    let a = 54;
    let b = 37;
    console.log(a + b);
  4. 4.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) for
  5. 5.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 10;
    coins = coins - 21;
    console.log(coins);
  6. 6.⚡ What number does this code print?
    let score = 25;
    score = score + 4;
    score = score - 25;
    console.log(score);
  7. 7.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
  8. 8.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
  9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y);     (a) 12 (b) Error (c) 84
  11. 11.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
  12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y);     (a) 10 (b) Error (c) 19
  13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y);     (a) Error (b) 9 (c) 54
  14. 14.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
  15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
  16. 16.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
  17. 17.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 7;
    apples = apples - 11;
    console.log(apples);
  18. 18.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
  19. 19.⚡ What number does this code print?
    let score = 5;
    score = score + 16;
    score = score - 5;
    console.log(score);
  20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) name (b) Meera (c) Hello, Meera! (d) Hello, name!
  21. 21.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!");     (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!
  22. 22.⚡ What number does this code print?
    let a = 31;
    let b = 4;
    console.log(a + b);
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y);     (a) 59 (b) 14 (c) Error
  24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) if (d) let
  25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!");     (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
  26. 26.⚡ What number does this code print?
    let a = 24;
    let b = 15;
    console.log(a + b);
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y);     (a) 11 (b) 92 (c) Error
  28. 28.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
  29. 29.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 14;
    coins = coins - 21;
    console.log(coins);
  30. 30.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 7;
    marks = marks - 21;
    console.log(marks);
  31. 31.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
  32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) name (b) Meera (c) Well done, name! (d) Well done, Meera!
  33. 33.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
  34. 34.⚡ What number does this code print?
    let books = 19;
    books = books + 16;
    books = books - 12;
    console.log(books);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y);     (a) 23 (b) Error (c) 5
  36. 36.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
  37. 37.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 19;
    apples = apples - 11;
    console.log(apples);
  38. 38.⚡ What number does this code print?
    let a = 31;
    let b = 18;
    console.log(a + b);
  39. 39.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 15;
    apples = apples - 9;
    console.log(apples);
  40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!

Answer key

  1. in the console
  2. for
  3. 91
  4. if
  5. 12
  6. 4
  7. Hello, Riya!
  8. 63
  9. console.log()
  10. 84
  11. a pop-up box
  12. 19
  13. 54
  14. actions and changes
  15. Well done, Kabir!
  16. let
  17. 15
  18. <script>
  19. 16
  20. Hello, Meera!
  21. Welcome, Zoya!
  22. 35
  23. 59
  24. let
  25. Hi, Meera!
  26. 39
  27. 92
  28. 66
  29. 2
  30. 0
  31. 88
  32. Well done, Meera!
  33. .js
  34. 23
  35. 23
  36. alert()
  37. 19
  38. 49
  39. 32
  40. Hello, Arjun!

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