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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 375 · 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 apples = 17;
    apples = apples + 8;
    apples = apples - 6;
    console.log(apples);
  2. 2.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 19;
    coins = coins - 25;
    console.log(coins);
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y);     (a) Error (b) 22 (c) 4
  4. 4.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
  5. 5.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y);     (a) Error (b) 93 (c) 12
  6. 6.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) console.log()
  7. 7.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
  8. 8.⚡ What number does this code print?
    let books = 22;
    books = books + 8;
    books = books - 9;
    console.log(books);
  9. 9.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!");     (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
  10. 10.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
  11. 11.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Arjun (c) name (d) Hello, Arjun!
  12. 12.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
  13. 13.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 16;
    coins = coins - 30;
    console.log(coins);
  14. 14.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) for
  15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
  16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) if (d) for
  17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
  18. 18.⚡ What number does this code print?
    let a = 46;
    let b = 12;
    console.log(a - b);
  19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
  20. 20.⚡ What number does this code print?
    let a = 28;
    let b = 26;
    console.log(a - b);
  21. 21.⚡ What number does this code print?
    let books = 25;
    books = books + 11;
    books = books - 5;
    console.log(books);
  22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) Well done, Arjun! (c) name (d) Arjun
  23. 23.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 6;
    apples = apples - 5;
    console.log(apples);
  24. 24.⚡ What number does this code print?
    let books = 25;
    books = books + 3;
    books = books - 24;
    console.log(books);
  25. 25.⚡ What number does this code print?
    let a = 57;
    let b = 1;
    console.log(a + b);
  26. 26.⚡ What number does this code print?
    let a = 58;
    let b = 30;
    console.log(a + b);
  27. 27.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);
  28. 28.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 19;
    coins = coins - 5;
    console.log(coins);
  29. 29.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
  30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
  31. 31.⚡ What number does this code print?
    let a = 42;
    let b = 27;
    console.log(a - b);
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y);     (a) 21 (b) Error (c) 3
  33. 33.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
  34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
  35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y);     (a) 13 (b) Error (c) 4
  37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Zoya (d) Hello, Zoya!
  38. 38.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) 5 (b) 14 (c) Error
  40. 40.⚡ What number does this code print?
    let a = 41;
    let b = 19;
    console.log(a - b);

Answer key

  1. 19
  2. 22
  3. 22
  4. Hi, Arjun!
  5. 93
  6. alert()
  7. .js
  8. 21
  9. Hi, Riya!
  10. let
  11. Hello, Arjun!
  12. <script>
  13. 2
  14. console.log()
  15. actions and changes
  16. for
  17. in the console
  18. 34
  19. 80
  20. 2
  21. 31
  22. Well done, Arjun!
  23. 12
  24. 4
  25. 58
  26. 88
  27. 8
  28. 22
  29. a pop-up box
  30. Hello, Meera!
  31. 15
  32. 21
  33. let
  34. 88
  35. Well done, Riya!
  36. 13
  37. Hello, Zoya!
  38. if
  39. 14
  40. 22

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