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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 545 · 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 a = 58;
    let b = 19;
    console.log(a + b);
  2. 2.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y);     (a) Error (b) 72 (c) 9
  4. 4.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
  5. 5.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
  6. 6.⚡ What number does this code print?
    let a = 39;
    let b = 10;
    console.log(a - b);
  7. 7.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
  8. 8.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y);     (a) 16 (b) Error (c) 97
  9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y);     (a) 7 (b) Error (c) 52
  11. 11.⚡ What number does this code print?
    let a = 44;
    let b = 29;
    console.log(a + b);
  12. 12.⚡ 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
  13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!");     (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
  14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
  15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
  16. 16.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) console.log() (d) let
  17. 17.⚡ What number does this code print?
    let a = 47;
    let b = 10;
    console.log(a - b);
  18. 18.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
  19. 19.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 4;
    coins = coins - 9;
    console.log(coins);
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y);     (a) Error (b) 7 (c) 25
  21. 21.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) let
  22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!");     (a) name (b) Well done, Riya! (c) Riya (d) Well done, name!
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) Error (b) 5 (c) 14
  24. 24.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
  25. 25.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
  26. 26.⚡ What number does this code print?
    let score = 15;
    score = score + 14;
    score = score - 4;
    console.log(score);
  27. 27.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 20;
    apples = apples - 29;
    console.log(apples);
  28. 28.⚡ What number does this code print?
    let a = 40;
    let b = 26;
    console.log(a + b);
  29. 29.⚡ What number does this code print?
    let score = 11;
    score = score + 12;
    score = score - 10;
    console.log(score);
  30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y);     (a) 8 (b) Error (c) 62
  31. 31.⚡ What number does this code print?
    let a = 13;
    let b = 6;
    console.log(a - b);
  32. 32.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 12;
    marks = marks - 13;
    console.log(marks);
  33. 33.⚡ What number does this code print?
    let score = 18;
    score = score + 14;
    score = score - 19;
    console.log(score);
  34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
  35. 35.⚡ What number does this code print?
    let score = 12;
    score = score + 5;
    score = score - 8;
    console.log(score);
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y);     (a) Error (b) 10 (c) 37
  37. 37.⚡ What number does this code print?
    let a = 40;
    let b = 6;
    console.log(a - b);
  38. 38.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 18;
    apples = apples - 33;
    console.log(apples);
  39. 39.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
  40. 40.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for

Answer key

  1. 77
  2. Well done, Arjun!
  3. 72
  4. Welcome, Riya!
  5. a pop-up box
  6. 29
  7. for
  8. 97
  9. .js
  10. 52
  11. 73
  12. 41
  13. Welcome, Meera!
  14. Well done, Riya!
  15. <script>
  16. console.log()
  17. 37
  18. if
  19. 17
  20. 25
  21. alert()
  22. Well done, Riya!
  23. 14
  24. let
  25. in the console
  26. 25
  27. 7
  28. 66
  29. 13
  30. 62
  31. 7
  32. 6
  33. 13
  34. Welcome, Meera!
  35. 9
  36. 37
  37. 34
  38. 0
  39. actions and changes
  40. let

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