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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 344 · 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 print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y);     (a) Error (b) 6 (c) 42
  2. 2.⚡ What number does this code print?
    let a = 37;
    let b = 35;
    console.log(a - b);
  3. 3.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 14;
    coins = coins - 19;
    console.log(coins);
  4. 4.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) 6 (b) 51 (c) Error
  5. 5.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
  6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
  7. 7.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
  8. 8.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
  9. 9.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
  10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
  11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) let
  12. 12.⚡ What number does this code print?
    let a = 50;
    let b = 37;
    console.log(a - b);
  13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y);     (a) 9 (b) Error (c) 18
  14. 14.⚡ What number does this code print?
    let a = 44;
    let b = 6;
    console.log(a + b);
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y);     (a) Error (b) 56 (c) 11
  16. 16.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) let
  17. 17.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 19;
    coins = coins - 18;
    console.log(coins);
  18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Arjun (b) Well done, Arjun! (c) Well done, name! (d) name
  19. 19.⚡ What number does this code print?
    let books = 5;
    books = books + 11;
    books = books - 4;
    console.log(books);
  20. 20.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y);     (a) 9 (b) 36 (c) Error
  22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a * b);
  23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
  24. 24.⚡ What number does this code print?
    let a = 57;
    let b = 39;
    console.log(a - b);
  25. 25.⚡ What number does this code print?
    let a = 32;
    let b = 39;
    console.log(a + b);
  26. 26.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
  27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Hello, Riya! (d) Riya
  28. 28.⚡ What number does this code print?
    let score = 11;
    score = score + 17;
    score = score - 6;
    console.log(score);
  29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
  30. 30.⚡ What number does this code print?
    let a = 57;
    let b = 10;
    console.log(a + b);
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y);     (a) 45 (b) Error (c) 9
  32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
  33. 33.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
  34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
  35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
  36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) Error (b) 13 (c) 67
  38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y);     (a) 10 (b) Error (c) 46
  39. 39.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 14;
    apples = apples - 2;
    console.log(apples);
  40. 40.⚡ What number does this code print?
    let a = 41;
    let b = 3;
    console.log(a - b);

Answer key

  1. 42
  2. 2
  3. 8
  4. 51
  5. let
  6. console.log()
  7. Welcome, Riya!
  8. <script>
  9. Hello, Aman!
  10. alert()
  11. if
  12. 13
  13. 18
  14. 50
  15. 56
  16. for
  17. 22
  18. Well done, Arjun!
  19. 12
  20. actions and changes
  21. 36
  22. 72
  23. Well done, Zoya!
  24. 18
  25. 71
  26. .js
  27. Hello, Riya!
  28. 22
  29. Welcome, Meera!
  30. 67
  31. 45
  32. Hello, Zoya!
  33. a pop-up box
  34. 15
  35. Welcome, Zoya!
  36. 27
  37. 67
  38. 46
  39. 22
  40. 38

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