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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 611 · 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 does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y);     (a) Error (b) 85 (c) 13
  2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
  3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
  4. 4.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) Welcome, Riya! (b) name (c) Welcome, name! (d) Riya
  5. 5.⚡ What number does this code print?
    let a = 60;
    let b = 33;
    console.log(a + b);
  6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
  7. 7.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
  8. 8.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
  9. 9.⚡ What number does this code print?
    let score = 20;
    score = score + 10;
    score = score - 11;
    console.log(score);
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) 10 (b) Error (c) 82
  11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y);     (a) 46 (b) 10 (c) Error
  12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y);     (a) 14 (b) 86 (c) Error
  13. 13.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
  14. 14.⚡ What number does this code print?
    let a = 21;
    let b = 32;
    console.log(a + b);
  15. 15.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
  16. 16.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y);     (a) Error (b) 87 (c) 15
  18. 18.⚡ What number does this code print?
    let a = 57;
    let b = 6;
    console.log(a + b);
  19. 19.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);
  20. 20.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
  21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) Well done, Meera! (b) name (c) Well done, name! (d) Meera
  22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!");     (a) Hi, Riya! (b) Hi, name! (c) name (d) Riya
  23. 23.⚡ What number does this code print?
    let score = 14;
    score = score + 7;
    score = score - 14;
    console.log(score);
  24. 24.⚡ What number does this code print?
    let a = 21;
    let b = 29;
    console.log(a + b);
  25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
  26. 26.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
  27. 27.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) if
  28. 28.⚡ What number does this code print?
    let a = 34;
    let b = 32;
    console.log(a - b);
  29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) Well done, name! (c) name (d) Well done, Zoya!
  30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y);     (a) 6 (b) Error (c) 15
  31. 31.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 14;
    coins = coins - 24;
    console.log(coins);
  32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!");     (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
  33. 33.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
  34. 34.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y);     (a) 17 (b) Error (c) 98
  36. 36.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
  37. 37.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
  38. 38.⚡ What number does this code print?
    let a = 22;
    let b = 10;
    console.log(a + b);
  39. 39.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y);     (a) 5 (b) Error (c) 41

Answer key

  1. 85
  2. alert()
  3. let
  4. Welcome, Riya!
  5. 93
  6. <script>
  7. let
  8. Hello, Zoya!
  9. 19
  10. 82
  11. 46
  12. 86
  13. in the console
  14. 53
  15. .js
  16. 88
  17. 87
  18. 63
  19. 5
  20. if
  21. Well done, Meera!
  22. Hi, Riya!
  23. 7
  24. 50
  25. Well done, Riya!
  26. 144
  27. console.log()
  28. 2
  29. Well done, Zoya!
  30. 15
  31. 15
  32. Hello, Riya!
  33. a pop-up box
  34. 96
  35. 98
  36. for
  37. actions and changes
  38. 32
  39. Well done, Arjun!
  40. 41

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