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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 685 · 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 marks = 10;
    marks = marks + 12;
    marks = marks - 15;
    console.log(marks);
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y);     (a) 8 (b) Error (c) 44
  3. 3.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
  4. 4.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) alert() (d) console.log()
  5. 5.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
  6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
  7. 7.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 10;
    coins = coins - 13;
    console.log(coins);
  8. 8.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
  9. 9.⚡ What number does this code print?
    let a = 30;
    let b = 8;
    console.log(a + b);
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y);     (a) 83 (b) Error (c) 11
  11. 11.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) if
  12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y);     (a) 6 (b) Error (c) 33
  13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!");     (a) Hi, Arjun! (b) Arjun (c) name (d) Hi, name!
  14. 14.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) let
  15. 15.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!");     (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
  16. 16.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
  17. 17.⚡ What number does this code print?
    let a = 26;
    let b = 23;
    console.log(a - b);
  18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y);     (a) 11 (b) Error (c) 29
  20. 20.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 19;
    runs = runs - 25;
    console.log(runs);
  21. 21.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
  22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
  23. 23.⚡ What number does this code print?
    let a = 47;
    let b = 15;
    console.log(a - b);
  24. 24.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) for (d) let
  25. 25.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y);     (a) 5 (b) Error (c) 23
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y);     (a) 5 (b) Error (c) 41
  28. 28.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 14;
    runs = runs - 3;
    console.log(runs);
  29. 29.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
  30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
  31. 31.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 14;
    marks = marks - 7;
    console.log(marks);
  32. 32.⚡ What number does this code print?
    let a = 42;
    let b = 4;
    console.log(a - b);
  33. 33.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
  34. 34.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 12;
    marks = marks - 16;
    console.log(marks);
  35. 35.⚡ What number does this code print?
    let a = 20;
    let b = 4;
    console.log(a + b);
  36. 36.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
  37. 37.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 18;
    runs = runs - 17;
    console.log(runs);
  38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y);     (a) 97 (b) Error (c) 16
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y);     (a) 53 (b) 8 (c) Error
  40. 40.⚡ What number does this code print?
    let a = 22;
    let b = 17;
    console.log(a + b);

Answer key

  1. 7
  2. 44
  3. 22
  4. console.log()
  5. 16
  6. actions and changes
  7. 24
  8. <script>
  9. 38
  10. 83
  11. alert()
  12. 33
  13. Hi, Arjun!
  14. for
  15. Hi, Zoya!
  16. Well done, Zoya!
  17. 3
  18. Well done, Riya!
  19. 29
  20. 21
  21. let
  22. 120
  23. 32
  24. let
  25. .js
  26. 23
  27. 41
  28. 24
  29. if
  30. 6
  31. 21
  32. 38
  33. in the console
  34. 3
  35. 24
  36. a pop-up box
  37. 6
  38. 97
  39. 53
  40. 39

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