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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 919 · 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 = "8";
    let y = 5;
    console.log(x + y);     (a) 13 (b) 85 (c) Error
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) Error (b) 51 (c) 6
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y);     (a) 14 (b) 59 (c) Error
  4. 4.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
  5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
  6. 6.⚡ What number does this code print?
    let a = 21;
    let b = 7;
    console.log(a + b);
  7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) alert()
  8. 8.⚡ What number does this code print?
    let books = 17;
    books = books + 2;
    books = books - 6;
    console.log(books);
  9. 9.⚡ What number does this code print?
    let a = 44;
    let b = 32;
    console.log(a + b);
  10. 10.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
  11. 11.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
  12. 12.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
  13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
  14. 14.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 6;
    apples = apples - 20;
    console.log(apples);
  15. 15.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
  16. 16.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
  17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
  18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y);     (a) 27 (b) Error (c) 9
  19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
  20. 20.⚡ What number does this code print?
    let a = 31;
    let b = 15;
    console.log(a - b);
  21. 21.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
  22. 22.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
  23. 23.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
  24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 33;
    console.log(a + b);
  25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y);     (a) 48 (b) Error (c) 12
  26. 26.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
  27. 27.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 8;
    apples = apples - 18;
    console.log(apples);
  28. 28.⚡ What number does this code print?
    let books = 19;
    books = books + 13;
    books = books - 23;
    console.log(books);
  29. 29.⚡ What number does this code print?
    let a = 44;
    let b = 16;
    console.log(a - b);
  30. 30.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
  31. 31.⚡ What number does this code print?
    let a = 54;
    let b = 32;
    console.log(a - b);
  32. 32.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 12;
    coins = coins - 14;
    console.log(coins);
  33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!");     (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
  34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) 65 (b) Error (c) 11
  35. 35.⚡ What number does this code print?
    let a = 7;
    let b = 35;
    console.log(a + b);
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y);     (a) 81 (b) Error (c) 9
  37. 37.⚡ What number does this code print?
    let books = 25;
    books = books + 5;
    books = books - 22;
    console.log(books);
  38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Hello, Riya! (d) Riya
  39. 39.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
  40. 40.⚡ What number does this code print?
    let books = 20;
    books = books + 12;
    books = books - 4;
    console.log(books);

Answer key

  1. 85
  2. 51
  3. 59
  4. 33
  5. if
  6. 28
  7. let
  8. 13
  9. 76
  10. .js
  11. actions and changes
  12. console.log()
  13. Well done, Kabir!
  14. 16
  15. for
  16. 10
  17. 35
  18. 27
  19. Hello, Aman!
  20. 16
  21. let
  22. <script>
  23. a pop-up box
  24. 38
  25. 48
  26. 28
  27. 6
  28. 9
  29. 28
  30. Hello, Zoya!
  31. 22
  32. 19
  33. Hi, Kabir!
  34. 65
  35. 42
  36. 81
  37. 8
  38. Hello, Riya!
  39. 27
  40. 28

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