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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 719 · 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.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
  2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) for
  3. 3.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
  4. 4.⚡ What number does this code print?
    let a = 37;
    let b = 22;
    console.log(a + b);
  5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
  6. 6.⚡ What number does this code print?
    let books = 23;
    books = books + 18;
    books = books - 1;
    console.log(books);
  7. 7.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y);     (a) 12 (b) 93 (c) Error
  8. 8.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
  9. 9.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) Error (b) 14 (c) 5
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y);     (a) 11 (b) 92 (c) Error
  11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Arjun! (c) Arjun (d) name
  12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
  13. 13.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 10;
    marks = marks - 5;
    console.log(marks);
  14. 14.⚡ What number does this code print?
    let a = 6;
    let b = 9;
    console.log(a * b);
  15. 15.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!");     (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
  16. 16.⚡ What number does this code print?
    let a = 50;
    let b = 10;
    console.log(a - b);
  17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) if
  18. 18.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 13;
    coins = coins - 18;
    console.log(coins);
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y);     (a) 72 (b) 9 (c) Error
  20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
  21. 21.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 4;
    runs = runs - 3;
    console.log(runs);
  22. 22.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
  23. 23.⚡ What number does this code print?
    let a = 34;
    let b = 17;
    console.log(a - b);
  24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y);     (a) 63 (b) Error (c) 9
  25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y);     (a) 13 (b) 58 (c) Error
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y);     (a) 85 (b) 13 (c) Error
  27. 27.⚡ What number does this code print?
    let books = 11;
    books = books + 12;
    books = books - 17;
    console.log(books);
  28. 28.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 9;
    runs = runs - 2;
    console.log(runs);
  29. 29.⚡ What number does this code print?
    let a = 38;
    let b = 37;
    console.log(a + b);
  30. 30.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!");     (a) Zoya (b) Welcome, Zoya! (c) name (d) Welcome, name!
  31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y);     (a) 11 (b) 83 (c) Error
  33. 33.⚡ What number does this code print?
    let a = 28;
    let b = 16;
    console.log(a - b);
  34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
  35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
  36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y);     (a) 86 (b) Error (c) 14
  38. 38.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
  39. 39.⚡ What number does this code print?
    let a = 16;
    let b = 13;
    console.log(a - b);
  40. 40.⚡ What number does this code print?
    let score = 12;
    score = score + 5;
    score = score - 1;
    console.log(score);

Answer key

  1. .js
  2. let
  3. let
  4. 59
  5. console.log()
  6. 40
  7. 93
  8. if
  9. 14
  10. 92
  11. Hello, Arjun!
  12. Welcome, Riya!
  13. 14
  14. 54
  15. Hi, Kabir!
  16. 40
  17. alert()
  18. 22
  19. 72
  20. actions and changes
  21. 11
  22. a pop-up box
  23. 17
  24. 63
  25. 58
  26. 85
  27. 6
  28. 36
  29. 75
  30. Welcome, Zoya!
  31. Well done, Meera!
  32. 83
  33. 12
  34. 63
  35. Welcome, Meera!
  36. 16
  37. 86
  38. in the console
  39. 3
  40. 16

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