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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 80 · 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 this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) Kabir (b) Welcome, Kabir! (c) name (d) Welcome, name!
  2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
  3. 3.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) console.log() (d) alert()
  4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
  5. 5.⚡ What number does this code print?
    let a = 19;
    let b = 12;
    console.log(a - b);
  6. 6.⚡ What number does this code print?
    let a = 26;
    let b = 15;
    console.log(a + b);
  7. 7.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 3;
    runs = runs - 18;
    console.log(runs);
  8. 8.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
  9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
  10. 10.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) alert()
  11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Hello, Arjun! (d) Arjun
  12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
  13. 13.⚡ What number does this code print?
    let a = 47;
    let b = 10;
    console.log(a - b);
  14. 14.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
  15. 15.⚡ 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
  16. 16.⚡ What number does this code print?
    let score = 24;
    score = score + 5;
    score = score - 16;
    console.log(score);
  17. 17.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 20;
    runs = runs - 26;
    console.log(runs);
  18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y);     (a) Error (b) 11 (c) 38
  19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) Well done, Aman! (b) Aman (c) name (d) Well done, name!
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y);     (a) 8 (b) Error (c) 35
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y);     (a) Error (b) 61 (c) 7
  22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!");     (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y);     (a) 78 (b) Error (c) 15
  24. 24.⚡ What number does this code print?
    let score = 11;
    score = score + 19;
    score = score - 15;
    console.log(score);
  25. 25.⚡ What number does this code print?
    let a = 58;
    let b = 36;
    console.log(a + b);
  26. 26.⚡ What number does this code print?
    let a = 42;
    let b = 8;
    console.log(a + b);
  27. 27.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 3;
    coins = coins - 14;
    console.log(coins);
  28. 28.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
  29. 29.⚡ 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!
  30. 30.⚡ What number does this code print?
    let a = 55;
    let b = 28;
    console.log(a - b);
  31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!");     (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
  32. 32.⚡ What number does this code print?
    let books = 23;
    books = books + 10;
    books = books - 8;
    console.log(books);
  33. 33.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
  34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 5 (b) 32 (c) Error
  35. 35.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
  36. 36.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
  37. 37.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 8;
    marks = marks - 6;
    console.log(marks);
  38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y);     (a) 7 (b) 16 (c) Error
  39. 39.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 4;
    runs = runs - 10;
    console.log(runs);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y);     (a) Error (b) 34 (c) 7

Answer key

  1. Welcome, Kabir!
  2. let
  3. if
  4. alert()
  5. 7
  6. 41
  7. 7
  8. actions and changes
  9. console.log()
  10. for
  11. Hello, Arjun!
  12. Well done, Riya!
  13. 37
  14. 36
  15. in the console
  16. 13
  17. 15
  18. 38
  19. Well done, Aman!
  20. 35
  21. 61
  22. Welcome, Meera!
  23. 78
  24. 15
  25. 94
  26. 50
  27. 9
  28. a pop-up box
  29. Well done, Arjun!
  30. 27
  31. Welcome, Aman!
  32. 25
  33. <script>
  34. 32
  35. let
  36. .js
  37. 16
  38. 16
  39. 8
  40. 34

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