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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 367 · 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 apples = 8;
    apples = apples + 19;
    apples = apples - 27;
    console.log(apples);
  2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
  3. 3.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 5;
    coins = coins - 24;
    console.log(coins);
  4. 4.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
  5. 5.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
  6. 6.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
  7. 7.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
  8. 8.⚡ What number does this code print?
    let a = 29;
    let b = 6;
    console.log(a - b);
  9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y);     (a) 98 (b) 17 (c) Error
  11. 11.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 4;
    marks = marks - 8;
    console.log(marks);
  12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
  13. 13.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) for
  14. 14.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
  15. 15.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!");     (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
  16. 16.⚡ What number does this code print?
    let a = 53;
    let b = 6;
    console.log(a - b);
  17. 17.⚡ What number does this code print?
    let a = 43;
    let b = 24;
    console.log(a + b);
  18. 18.⚡ What number does this code print?
    let score = 11;
    score = score + 14;
    score = score - 6;
    console.log(score);
  19. 19.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) for
  20. 20.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 4;
    apples = apples - 17;
    console.log(apples);
  21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
  22. 22.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
  23. 23.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
  24. 24.⚡ What number does this code print?
    let a = 7;
    let b = 33;
    console.log(a + b);
  25. 25.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a - b);
  26. 26.⚡ What number does this code print?
    let books = 21;
    books = books + 5;
    books = books - 22;
    console.log(books);
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y);     (a) 12 (b) Error (c) 57
  28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
  29. 29.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 11;
    coins = coins - 19;
    console.log(coins);
  30. 30.⚡ What number does this code print?
    let a = 17;
    let b = 2;
    console.log(a - b);
  31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
  32. 32.⚡ 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
  33. 33.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 3;
    coins = coins - 10;
    console.log(coins);
  34. 34.⚡ What number does this code print?
    let books = 24;
    books = books + 19;
    books = books - 26;
    console.log(books);
  35. 35.⚡ What number does this code print?
    let a = 30;
    let b = 9;
    console.log(a - b);
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y);     (a) 64 (b) Error (c) 10
  37. 37.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
  38. 38.⚡ 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
  39. 39.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 9;
    runs = runs - 16;
    console.log(runs);
  40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name

Answer key

  1. 0
  2. in the console
  3. 5
  4. Hello, Meera!
  5. for
  6. Well done, Riya!
  7. let
  8. 23
  9. <script>
  10. 98
  11. 10
  12. Hello, Kabir!
  13. if
  14. let
  15. Well done, Kabir!
  16. 47
  17. 67
  18. 19
  19. alert()
  20. 0
  21. Welcome, Aman!
  22. a pop-up box
  23. actions and changes
  24. 40
  25. 2
  26. 4
  27. 57
  28. .js
  29. 16
  30. 15
  31. Well done, Aman!
  32. 52
  33. 17
  34. 17
  35. 21
  36. 64
  37. console.log()
  38. Well done, Arjun!
  39. 0
  40. Well done, Zoya!

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