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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 74 · 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.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
  2. 2.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!");     (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y);     (a) 12 (b) Error (c) 75
  4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
  5. 5.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
  6. 6.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
  7. 7.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
  8. 8.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 20;
    apples = apples - 13;
    console.log(apples);
  9. 9.⚡ What number does this code print?
    let a = 60;
    let b = 18;
    console.log(a + b);
  10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
  11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!");     (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
  12. 12.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
  13. 13.⚡ What number does this code print?
    let a = 39;
    let b = 5;
    console.log(a - b);
  14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y);     (a) 37 (b) Error (c) 10
  15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
  16. 16.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
  17. 17.⚡ What number does this code print?
    let a = 43;
    let b = 39;
    console.log(a + b);
  18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y);     (a) 11 (b) Error (c) 47
  19. 19.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) if
  20. 20.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 4;
    coins = coins - 9;
    console.log(coins);
  21. 21.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 12;
    marks = marks - 16;
    console.log(marks);
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y);     (a) 91 (b) Error (c) 10
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y);     (a) 83 (b) 11 (c) Error
  24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
  25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
  26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 36;
    console.log(a + b);
  27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
  28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y);     (a) Error (b) 7 (c) 16
  29. 29.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
  30. 30.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
  31. 31.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y);     (a) 14 (b) 86 (c) Error
  33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y);     (a) 34 (b) Error (c) 7
  34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) Kabir (c) name (d) Well done, Kabir!
  35. 35.⚡ What number does this code print?
    let books = 27;
    books = books + 18;
    books = books - 15;
    console.log(books);
  36. 36.⚡ What number does this code print?
    let books = 29;
    books = books + 15;
    books = books - 24;
    console.log(books);
  37. 37.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 20;
    marks = marks - 1;
    console.log(marks);
  38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) name (b) Meera (c) Welcome, Meera! (d) Welcome, name!
  39. 39.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) alert()
  40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, name! (c) Zoya (d) Hi, Zoya!

Answer key

  1. let
  2. Hi, Riya!
  3. 75
  4. actions and changes
  5. 16
  6. Well done, Zoya!
  7. a pop-up box
  8. 32
  9. 78
  10. alert()
  11. Hi, Riya!
  12. for
  13. 34
  14. 37
  15. 63
  16. 24
  17. 82
  18. 47
  19. console.log()
  20. 5
  21. 8
  22. 91
  23. 83
  24. <script>
  25. Hello, Aman!
  26. 55
  27. 63
  28. 16
  29. if
  30. in the console
  31. Hello, Kabir!
  32. 86
  33. 34
  34. Well done, Kabir!
  35. 30
  36. 20
  37. 28
  38. Welcome, Meera!
  39. let
  40. Hi, Zoya!

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