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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 833 · 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 = 9;
    let b = 4;
    console.log(a * b);
  2. 2.⚡ What number does this code print?
    let a = 45;
    let b = 37;
    console.log(a + b);
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y);     (a) Error (b) 8 (c) 71
  4. 4.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
  5. 5.⚡ What number does this code print?
    let score = 17;
    score = score + 3;
    score = score - 2;
    console.log(score);
  6. 6.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y);     (a) Error (b) 9 (c) 72
  7. 7.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
  8. 8.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) name (b) Hello, Arjun! (c) Hello, name! (d) Arjun
  9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
  10. 10.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
  11. 11.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
  12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) 11 (b) 65 (c) Error
  13. 13.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) let
  14. 14.⚡ What number does this code print?
    let a = 13;
    let b = 8;
    console.log(a - b);
  15. 15.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
  16. 16.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) if (d) alert()
  17. 17.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 3;
    runs = runs - 9;
    console.log(runs);
  18. 18.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
  19. 19.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
  20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
  21. 21.⚡ What number does this code print?
    let books = 28;
    books = books + 12;
    books = books - 25;
    console.log(books);
  22. 22.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
  23. 23.⚡ What number does this code print?
    let a = 31;
    let b = 5;
    console.log(a - b);
  24. 24.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 10;
    coins = coins - 14;
    console.log(coins);
  25. 25.⚡ What number does this code print?
    let score = 6;
    score = score + 8;
    score = score - 7;
    console.log(score);
  26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!");     (a) Hello, Riya! (b) Riya (c) Hello, name! (d) name
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y);     (a) 12 (b) 3 (c) Error
  28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!");     (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
  29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
  30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!");     (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
  31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) Error (b) 10 (c) 82
  33. 33.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
  34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y);     (a) 12 (b) Error (c) 57
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y);     (a) 13 (b) 94 (c) Error
  36. 36.⚡ What number does this code print?
    let score = 6;
    score = score + 7;
    score = score - 1;
    console.log(score);
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y);     (a) Error (b) 49 (c) 13
  38. 38.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 16;
    runs = runs - 19;
    console.log(runs);
  39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y);     (a) 19 (b) 10 (c) Error

Answer key

  1. 36
  2. 82
  3. 71
  4. let
  5. 18
  6. 72
  7. a pop-up box
  8. Hello, Arjun!
  9. <script>
  10. for
  11. 60
  12. 65
  13. alert()
  14. 5
  15. in the console
  16. console.log()
  17. 19
  18. 16
  19. if
  20. Hello, Riya!
  21. 15
  22. Hello, Meera!
  23. 26
  24. 8
  25. 7
  26. Hello, Riya!
  27. 12
  28. Hi, Aman!
  29. 42
  30. Welcome, Aman!
  31. Hello, Kabir!
  32. 82
  33. let
  34. 57
  35. 94
  36. 12
  37. 49
  38. 22
  39. 48
  40. 19

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