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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 93 · 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 = "5";
    let y = 2;
    console.log(x + y);     (a) Error (b) 7 (c) 52
  2. 2.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) Well done, Meera! (b) name (c) Meera (d) Well done, name!
  3. 3.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
  4. 4.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
  5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
  6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
  7. 7.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 8;
    apples = apples - 9;
    console.log(apples);
  8. 8.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
  9. 9.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
  10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
  11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
  12. 12.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 4;
    marks = marks - 3;
    console.log(marks);
  13. 13.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 2;
    apples = apples - 12;
    console.log(apples);
  14. 14.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 7;
    marks = marks - 12;
    console.log(marks);
  15. 15.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
  16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y);     (a) 9 (b) Error (c) 81
  18. 18.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
  19. 19.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
  20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
  21. 21.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
  22. 22.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
  23. 23.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 19;
    apples = apples - 8;
    console.log(apples);
  24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) Error (b) 10 (c) 82
  25. 25.⚡ What number does this code print?
    let a = 37;
    let b = 17;
    console.log(a - b);
  26. 26.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 18;
    apples = apples - 15;
    console.log(apples);
  27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
  28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
  29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
  30. 30.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) alert() (d) let
  31. 31.⚡ What number does this code print?
    let a = 23;
    let b = 16;
    console.log(a + b);
  32. 32.⚡ What number does this code print?
    let books = 26;
    books = books + 14;
    books = books - 3;
    console.log(books);
  33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
  34. 34.⚡ What number does this code print?
    let score = 11;
    score = score + 15;
    score = score - 1;
    console.log(score);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y);     (a) Error (b) 37 (c) 10
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y);     (a) 11 (b) Error (c) 56
  37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
  38. 38.⚡ What number does this code print?
    let a = 39;
    let b = 6;
    console.log(a + b);
  39. 39.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
  40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!");     (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya

Answer key

  1. 52
  2. Well done, Meera!
  3. Welcome, Meera!
  4. actions and changes
  5. let
  6. <script>
  7. 10
  8. Well done, Aman!
  9. for
  10. alert()
  11. .js
  12. 7
  13. 11
  14. 19
  15. in the console
  16. 72
  17. 81
  18. console.log()
  19. 12
  20. Hello, Meera!
  21. let
  22. 20
  23. 19
  24. 82
  25. 20
  26. 11
  27. Well done, Arjun!
  28. Welcome, Kabir!
  29. 63
  30. if
  31. 39
  32. 37
  33. Hello, Aman!
  34. 25
  35. 37
  36. 56
  37. Well done, Kabir!
  38. 45
  39. a pop-up box
  40. Hi, Zoya!

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