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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 377 · 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 = "7";
    let y = 4;
    console.log(x + y);     (a) Error (b) 11 (c) 74
  2. 2.⚡ What number does this code print?
    let score = 23;
    score = score + 6;
    score = score - 17;
    console.log(score);
  3. 3.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 3;
    apples = apples - 8;
    console.log(apples);
  4. 4.⚡ What number does this code print?
    let score = 20;
    score = score + 18;
    score = score - 26;
    console.log(score);
  5. 5.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!");     (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
  6. 6.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()
  7. 7.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
  8. 8.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) let
  9. 9.⚡ What number does this code print?
    let a = 28;
    let b = 7;
    console.log(a + b);
  10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y);     (a) 6 (b) 33 (c) Error
  11. 11.⚡ What number does this code print?
    let a = 18;
    let b = 17;
    console.log(a + b);
  12. 12.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
  13. 13.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 19;
    apples = apples - 2;
    console.log(apples);
  14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
  15. 15.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
  16. 16.⚡ 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
  17. 17.⚡ What number does this code print?
    let score = 9;
    score = score + 11;
    score = score - 9;
    console.log(score);
  18. 18.⚡ What number does this code print?
    let a = 51;
    let b = 35;
    console.log(a - b);
  19. 19.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
  20. 20.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 20;
    apples = apples - 15;
    console.log(apples);
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 5 (b) Error (c) 32
  22. 22.⚡ What number does this code print?
    let a = 19;
    let b = 5;
    console.log(a + b);
  23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
  24. 24.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
  25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Meera! (c) name (d) Meera
  26. 26.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
  27. 27.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
  28. 28.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
  29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y);     (a) Error (b) 9 (c) 27
  30. 30.⚡ What number does this code print?
    let a = 6;
    let b = 25;
    console.log(a + b);
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y);     (a) 16 (b) Error (c) 88
  32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
  33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
  34. 34.⚡ What number does this code print?
    let books = 11;
    books = books + 18;
    books = books - 26;
    console.log(books);
  35. 35.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
  36. 36.⚡ What number does this code print?
    let a = 51;
    let b = 1;
    console.log(a - b);
  37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
  38. 38.⚡ What number does this code print?
    let books = 26;
    books = books + 4;
    books = books - 8;
    console.log(books);
  39. 39.⚡ What number does this code print?
    let a = 33;
    let b = 38;
    console.log(a + b);
  40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name

Answer key

  1. 74
  2. 12
  3. 15
  4. 12
  5. Hi, Meera!
  6. if
  7. for
  8. console.log()
  9. 35
  10. 33
  11. 35
  12. let
  13. 31
  14. 8
  15. let
  16. in the console
  17. 11
  18. 16
  19. a pop-up box
  20. 16
  21. 32
  22. 24
  23. Hello, Meera!
  24. alert()
  25. Hello, Meera!
  26. <script>
  27. 30
  28. actions and changes
  29. 27
  30. 31
  31. 88
  32. 16
  33. Hello, Aman!
  34. 3
  35. 10
  36. 50
  37. Hello, Riya!
  38. 22
  39. 71
  40. Welcome, Riya!

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