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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 142 · 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 a = 30;
    let b = 10;
    console.log(a - b);
  2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
  3. 3.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
  4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
  5. 5.⚡ 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!
  6. 6.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
  7. 7.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y);     (a) 11 (b) Error (c) 29
  8. 8.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
  9. 9.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
  10. 10.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 13;
    coins = coins - 4;
    console.log(coins);
  11. 11.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 17;
    runs = runs - 8;
    console.log(runs);
  12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
  13. 13.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) console.log()
  14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
  15. 15.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
  16. 16.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y);     (a) 7 (b) Error (c) 34
  18. 18.⚡ What number does this code print?
    let a = 30;
    let b = 35;
    console.log(a + b);
  19. 19.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y);     (a) 57 (b) Error (c) 12
  21. 21.⚡ What number does this code print?
    let a = 42;
    let b = 10;
    console.log(a + b);
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) 6 (b) 51 (c) Error
  23. 23.⚡ What number does this code print?
    let a = 20;
    let b = 19;
    console.log(a + b);
  24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
  25. 25.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 15;
    marks = marks - 22;
    console.log(marks);
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y);     (a) Error (b) 14 (c) 77
  27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
  28. 28.⚡ What number does this code print?
    let a = 31;
    let b = 21;
    console.log(a + b);
  29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 11;
    console.log(a * b);
  30. 30.⚡ 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
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) Error (b) 5 (c) 32
  32. 32.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 6;
    apples = apples - 2;
    console.log(apples);
  33. 33.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 7;
    coins = coins - 6;
    console.log(coins);
  34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
  35. 35.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 11;
    apples = apples - 13;
    console.log(apples);
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y);     (a) Error (b) 83 (c) 11
  37. 37.⚡ What number does this code print?
    let a = 54;
    let b = 31;
    console.log(a - b);
  38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y);     (a) 4 (b) 22 (c) Error
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y);     (a) 7 (b) 61 (c) Error

Answer key

  1. 20
  2. console.log()
  3. <script>
  4. actions and changes
  5. Well done, Kabir!
  6. alert()
  7. 29
  8. Welcome, Kabir!
  9. in the console
  10. 16
  11. 17
  12. Well done, Kabir!
  13. for
  14. 132
  15. a pop-up box
  16. .js
  17. 34
  18. 65
  19. let
  20. 57
  21. 52
  22. 51
  23. 39
  24. Hello, Kabir!
  25. 6
  26. 77
  27. Welcome, Riya!
  28. 52
  29. 121
  30. 81
  31. 32
  32. 21
  33. 7
  34. 25
  35. 13
  36. 83
  37. 23
  38. Hello, Meera!
  39. 22
  40. 61

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