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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 341 · 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.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
  2. 2.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y);     (a) Error (b) 13 (c) 76
  3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
  4. 4.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y);     (a) 55 (b) Error (c) 10
  5. 5.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
  6. 6.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y);     (a) 48 (b) Error (c) 12
  7. 7.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
  8. 8.⚡ What number does this code print?
    let a = 38;
    let b = 8;
    console.log(a + b);
  9. 9.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 20;
    apples = apples - 37;
    console.log(apples);
  10. 10.⚡ What number does this code print?
    let a = 23;
    let b = 34;
    console.log(a + b);
  11. 11.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 19;
    coins = coins - 1;
    console.log(coins);
  12. 12.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 6;
    coins = coins - 17;
    console.log(coins);
  13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
  14. 14.⚡ What number does this code print?
    let a = 27;
    let b = 33;
    console.log(a + b);
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y);     (a) 52 (b) 7 (c) Error
  16. 16.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 5;
    coins = coins - 10;
    console.log(coins);
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) 6 (b) 51 (c) Error
  18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
  19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
  20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
  21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
  22. 22.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
  23. 23.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
  24. 24.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
  25. 25.⚡ 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
  26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a - b);
  27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
  28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
  29. 29.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
  30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
  31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y);     (a) Error (b) 46 (c) 10
  32. 32.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
  33. 33.⚡ What number does this code print?
    let a = 58;
    let b = 15;
    console.log(a + b);
  34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y);     (a) Error (b) 17 (c) 8
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y);     (a) 6 (b) Error (c) 33
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y);     (a) 9 (b) Error (c) 27
  37. 37.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
  38. 38.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!");     (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y);     (a) 7 (b) Error (c) 43
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y);     (a) 25 (b) 7 (c) Error

Answer key

  1. in the console
  2. 76
  3. <script>
  4. 55
  5. for
  6. 48
  7. actions and changes
  8. 46
  9. 13
  10. 57
  11. 37
  12. 0
  13. alert()
  14. 60
  15. 52
  16. 3
  17. 51
  18. .js
  19. Well done, Zoya!
  20. Well done, Riya!
  21. Hello, Kabir!
  22. 48
  23. console.log()
  24. 72
  25. 97
  26. 1
  27. 60
  28. Hello, Aman!
  29. 18
  30. Welcome, Meera!
  31. 46
  32. 16
  33. 73
  34. 17
  35. 33
  36. 27
  37. let
  38. Hi, Arjun!
  39. 43
  40. 25

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