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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 237 · 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) on the title bar (b) in the address bar (c) on the printer (d) in the console
  2. 2.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
  3. 3.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
  4. 4.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) for
  5. 5.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Riya (b) name (c) Welcome, name! (d) Welcome, Riya!
  6. 6.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 14;
    coins = coins - 9;
    console.log(coins);
  7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
  8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
  9. 9.⚡ What number does this code print?
    let books = 8;
    books = books + 14;
    books = books - 21;
    console.log(books);
  10. 10.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) alert() (d) if
  11. 11.⚡ What number does this code print?
    let score = 25;
    score = score + 5;
    score = score - 17;
    console.log(score);
  12. 12.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) let (d) for
  13. 13.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
  14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
  15. 15.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
  16. 16.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
  17. 17.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
  18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y);     (a) 6 (b) 24 (c) Error
  19. 19.⚡ What number does this code print?
    let books = 14;
    books = books + 4;
    books = books - 9;
    console.log(books);
  20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
  21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!");     (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
  22. 22.⚡ What number does this code print?
    let a = 22;
    let b = 9;
    console.log(a - b);
  23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
  24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
  25. 25.⚡ What number does this code print?
    let a = 30;
    let b = 10;
    console.log(a - b);
  26. 26.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
  27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
  28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
  29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Kabir (b) name (c) Well done, Kabir! (d) Well done, name!
  30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y);     (a) Error (b) 46 (c) 10
  31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
  32. 32.⚡ What number does this code print?
    let score = 15;
    score = score + 13;
    score = score - 11;
    console.log(score);
  33. 33.⚡ What number does this code print?
    let a = 34;
    let b = 14;
    console.log(a - b);
  34. 34.⚡ What number does this code print?
    let a = 28;
    let b = 5;
    console.log(a + b);
  35. 35.⚡ What number does this code print?
    let a = 29;
    let b = 25;
    console.log(a + b);
  36. 36.⚡ What number does this code print?
    let a = 59;
    let b = 24;
    console.log(a - b);
  37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
  38. 38.⚡ What number does this code print?
    let score = 14;
    score = score + 4;
    score = score - 10;
    console.log(score);
  39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!");     (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) Error (b) 82 (c) 10

Answer key

  1. in the console
  2. Hello, Meera!
  3. a pop-up box
  4. let
  5. Welcome, Riya!
  6. 16
  7. console.log()
  8. for
  9. 1
  10. if
  11. 13
  12. alert()
  13. 40
  14. Well done, Arjun!
  15. let
  16. <script>
  17. .js
  18. 24
  19. 9
  20. Hello, Meera!
  21. Hi, Zoya!
  22. 13
  23. Hi, Aman!
  24. Hello, Kabir!
  25. 20
  26. actions and changes
  27. Hello, Zoya!
  28. 60
  29. Well done, Kabir!
  30. 46
  31. Welcome, Arjun!
  32. 17
  33. 20
  34. 33
  35. 54
  36. 35
  37. Well done, Arjun!
  38. 8
  39. Hi, Meera!
  40. 82

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