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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 304 · 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.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) let (d) console.log()
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y);     (a) Error (b) 4 (c) 22
  3. 3.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!");     (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
  4. 4.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
  5. 5.⚡ What number does this code print?
    let a = 9;
    let b = 14;
    console.log(a + b);
  6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
  7. 7.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 8;
    runs = runs - 14;
    console.log(runs);
  8. 8.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
  9. 9.⚡ What number does this code print?
    let score = 8;
    score = score + 14;
    score = score - 2;
    console.log(score);
  10. 10.⚡ What number does this code print?
    let a = 28;
    let b = 20;
    console.log(a - b);
  11. 11.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
  12. 12.⚡ What number does this code print?
    let score = 15;
    score = score + 11;
    score = score - 10;
    console.log(score);
  13. 13.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
  14. 14.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
  15. 15.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y);     (a) 14 (b) Error (c) 77
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y);     (a) 10 (b) Error (c) 91
  18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!");     (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
  19. 19.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) 67 (b) 13 (c) Error
  21. 21.⚡ What number does this code print?
    let a = 34;
    let b = 30;
    console.log(a + b);
  22. 22.⚡ What number does this code print?
    let a = 41;
    let b = 14;
    console.log(a + b);
  23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!");     (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
  24. 24.⚡ 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
  25. 25.⚡ What number does this code print?
    let a = 24;
    let b = 10;
    console.log(a - b);
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y);     (a) 10 (b) 73 (c) Error
  27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
  28. 28.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
  29. 29.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 3;
    apples = apples - 1;
    console.log(apples);
  30. 30.⚡ What number does this code print?
    let a = 43;
    let b = 4;
    console.log(a + b);
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) Error (b) 65 (c) 11
  32. 32.⚡ 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
  33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
  34. 34.⚡ What number does this code print?
    let a = 16;
    let b = 11;
    console.log(a - b);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y);     (a) Error (b) 31 (c) 4
  36. 36.⚡ What number does this code print?
    let score = 30;
    score = score + 8;
    score = score - 25;
    console.log(score);
  37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!");     (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
  38. 38.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
  39. 39.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
  40. 40.⚡ What number does this code print?
    let a = 46;
    let b = 36;
    console.log(a + b);

Answer key

  1. for
  2. 22
  3. Welcome, Aman!
  4. alert()
  5. 23
  6. actions and changes
  7. 16
  8. 16
  9. 20
  10. 8
  11. in the console
  12. 16
  13. .js
  14. let
  15. console.log()
  16. 77
  17. 91
  18. Well done, Arjun!
  19. let
  20. 67
  21. 64
  22. 55
  23. Welcome, Aman!
  24. 97
  25. 14
  26. 73
  27. Hello, Aman!
  28. if
  29. 8
  30. 47
  31. 65
  32. 34
  33. Welcome, Riya!
  34. 5
  35. 31
  36. 13
  37. Hi, Kabir!
  38. <script>
  39. a pop-up box
  40. 82

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