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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 546 · 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.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
  2. 2.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
  3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
  4. 4.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
  5. 5.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) Meera (c) Well done, Meera! (d) name
  6. 6.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 7;
    coins = coins - 6;
    console.log(coins);
  7. 7.⚡ What number does this code print?
    let a = 30;
    let b = 38;
    console.log(a + b);
  8. 8.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 5;
    apples = apples - 19;
    console.log(apples);
  9. 9.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
  10. 10.⚡ What number does this code print?
    let books = 29;
    books = books + 2;
    books = books - 18;
    console.log(books);
  11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
  12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y);     (a) 88 (b) 16 (c) Error
  13. 13.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) let
  14. 14.⚡ What number does this code print?
    let a = 25;
    let b = 9;
    console.log(a - b);
  15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
  16. 16.⚡ What number does this code print?
    let score = 27;
    score = score + 7;
    score = score - 18;
    console.log(score);
  17. 17.⚡ What number does this code print?
    let a = 36;
    let b = 9;
    console.log(a + b);
  18. 18.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y);     (a) 4 (b) Error (c) 31
  20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
  21. 21.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 16;
    apples = apples - 19;
    console.log(apples);
  22. 22.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 12;
    apples = apples - 22;
    console.log(apples);
  23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
  24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Meera! (c) Meera (d) name
  25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
  26. 26.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
  27. 27.⚡ What number does this code print?
    let score = 29;
    score = score + 20;
    score = score - 34;
    console.log(score);
  28. 28.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) for
  29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
  30. 30.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 11;
    apples = apples - 28;
    console.log(apples);
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y);     (a) 12 (b) Error (c) 48
  32. 32.⚡ What number does this code print?
    let a = 35;
    let b = 30;
    console.log(a + b);
  33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!");     (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
  34. 34.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
  35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 32;
    console.log(a - b);
  36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) Aman (b) Well done, name! (c) name (d) Well done, Aman!
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y);     (a) 9 (b) Error (c) 72
  38. 38.⚡ What number does this code print?
    let score = 21;
    score = score + 8;
    score = score - 8;
    console.log(score);
  39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
  40. 40.⚡ What number does this code print?
    let a = 27;
    let b = 15;
    console.log(a + b);

Answer key

  1. <script>
  2. Hello, Aman!
  3. alert()
  4. let
  5. Well done, Meera!
  6. 17
  7. 68
  8. 8
  9. a pop-up box
  10. 13
  11. 108
  12. 88
  13. console.log()
  14. 16
  15. actions and changes
  16. 16
  17. 45
  18. in the console
  19. 31
  20. 12
  21. 10
  22. 11
  23. Welcome, Kabir!
  24. Welcome, Meera!
  25. Hello, Riya!
  26. 8
  27. 15
  28. if
  29. 110
  30. 10
  31. 48
  32. 65
  33. Hi, Kabir!
  34. .js
  35. 6
  36. Well done, Aman!
  37. 72
  38. 21
  39. Hi, Meera!
  40. 42

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