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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 167 · 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 tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
  2. 2.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!");     (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
  3. 3.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y);     (a) 8 (b) 62 (c) Error
  4. 4.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y);     (a) 37 (b) 10 (c) Error
  5. 5.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 5;
    apples = apples - 1;
    console.log(apples);
  6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) for
  7. 7.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a + b);
  8. 8.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
  9. 9.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
  10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
  11. 11.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
  12. 12.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
  13. 13.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 19;
    marks = marks - 30;
    console.log(marks);
  14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) Error (b) 5 (c) 14
  15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!");     (a) name (b) Meera (c) Well done, Meera! (d) Well done, name!
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y);     (a) 15 (b) 87 (c) Error
  17. 17.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
  18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
  19. 19.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
  20. 20.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
  21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!");     (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
  22. 22.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y);     (a) Error (b) 11 (c) 2
  24. 24.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
  25. 25.⚡ What number does this code print?
    let a = 42;
    let b = 11;
    console.log(a + b);
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y);     (a) Error (b) 9 (c) 81
  27. 27.⚡ What number does this code print?
    let a = 29;
    let b = 21;
    console.log(a + b);
  28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
  29. 29.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
  30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
  31. 31.⚡ What number does this code print?
    let a = 51;
    let b = 16;
    console.log(a - b);
  32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
  33. 33.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
  34. 34.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 5;
    marks = marks - 7;
    console.log(marks);
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y);     (a) 76 (b) 13 (c) Error
  36. 36.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
  37. 37.⚡ What number does this code print?
    let a = 23;
    let b = 25;
    console.log(a + b);
  38. 38.⚡ What number does this code print?
    let score = 23;
    score = score + 11;
    score = score - 32;
    console.log(score);
  39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!");     (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
  40. 40.⚡ What number does this code print?
    let a = 43;
    let b = 28;
    console.log(a - b);

Answer key

  1. <script>
  2. Welcome, Kabir!
  3. 62
  4. 37
  5. 22
  6. let
  7. 8
  8. .js
  9. 6
  10. Well done, Meera!
  11. for
  12. if
  13. 17
  14. 14
  15. Well done, Meera!
  16. 87
  17. 15
  18. Hello, Arjun!
  19. 80
  20. let
  21. Well done, Riya!
  22. 24
  23. 11
  24. alert()
  25. 53
  26. 81
  27. 50
  28. Well done, Zoya!
  29. a pop-up box
  30. Hello, Aman!
  31. 35
  32. 12
  33. console.log()
  34. 23
  35. 76
  36. in the console
  37. 48
  38. 2
  39. Well done, Arjun!
  40. 15

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