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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 716 · 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 = 33;
    let b = 27;
    console.log(a - b);
  2. 2.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
  3. 3.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
  4. 4.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
  5. 5.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
  6. 6.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!");     (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
  7. 7.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
  8. 8.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 4;
    runs = runs - 23;
    console.log(runs);
  9. 9.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y);     (a) 7 (b) 34 (c) Error
  11. 11.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
  12. 12.⚡ What number does this code print?
    let a = 13;
    let b = 35;
    console.log(a + b);
  13. 13.⚡ What number does this code print?
    let score = 9;
    score = score + 17;
    score = score - 4;
    console.log(score);
  14. 14.⚡ What number does this code print?
    let a = 24;
    let b = 23;
    console.log(a - b);
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y);     (a) 48 (b) 12 (c) Error
  16. 16.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
  17. 17.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 4;
    coins = coins - 20;
    console.log(coins);
  18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y);     (a) 97 (b) Error (c) 16
  19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
  20. 20.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 4;
    runs = runs - 6;
    console.log(runs);
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y);     (a) Error (b) 29 (c) 11
  22. 22.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y);     (a) 35 (b) Error (c) 8
  24. 24.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) alert() (d) if
  25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
  26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
  27. 27.⚡ What number does this code print?
    let score = 15;
    score = score + 16;
    score = score - 28;
    console.log(score);
  28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!");     (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
  29. 29.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 19;
    apples = apples - 14;
    console.log(apples);
  30. 30.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
  31. 31.⚡ What number does this code print?
    let a = 24;
    let b = 18;
    console.log(a + b);
  32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
  33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
  34. 34.⚡ What number does this code print?
    let score = 25;
    score = score + 18;
    score = score - 6;
    console.log(score);
  35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Meera (b) name (c) Well done, Meera! (d) Well done, name!
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y);     (a) 6 (b) 42 (c) Error
  37. 37.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 9;
    apples = apples - 1;
    console.log(apples);
  38. 38.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 2;
    apples = apples - 8;
    console.log(apples);
  39. 39.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 17;
    apples = apples - 8;
    console.log(apples);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y);     (a) Error (b) 11 (c) 74

Answer key

  1. 6
  2. <script>
  3. 81
  4. .js
  5. 36
  6. Hello, Kabir!
  7. let
  8. 5
  9. let
  10. 34
  11. console.log()
  12. 48
  13. 22
  14. 1
  15. 48
  16. alert()
  17. 8
  18. 97
  19. actions and changes
  20. 4
  21. 29
  22. in the console
  23. 35
  24. if
  25. Welcome, Riya!
  26. Hello, Kabir!
  27. 3
  28. Hi, Riya!
  29. 32
  30. a pop-up box
  31. 42
  32. 12
  33. 108
  34. 37
  35. Well done, Meera!
  36. 42
  37. 32
  38. 5
  39. 31
  40. 74

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