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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 54 · 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 = 39;
    let b = 1;
    console.log(a - b);
  2. 2.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
  3. 3.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
  4. 4.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!");     (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
  5. 5.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 12;
    apples = apples - 26;
    console.log(apples);
  6. 6.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
  7. 7.⚡ 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
  8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
  9. 9.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!");     (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
  10. 10.⚡ What number does this code print?
    let a = 33;
    let b = 18;
    console.log(a + b);
  11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) 14 (b) Error (c) 5
  12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, Arjun! (b) Arjun (c) Hello, name! (d) name
  13. 13.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
  14. 14.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y);     (a) 16 (b) 7 (c) Error
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y);     (a) 28 (b) Error (c) 10
  17. 17.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) for
  18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
  19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Well done, Zoya! (b) Well done, name! (c) Zoya (d) name
  20. 20.⚡ What number does this code print?
    let score = 13;
    score = score + 3;
    score = score - 7;
    console.log(score);
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y);     (a) 86 (b) Error (c) 14
  22. 22.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
  23. 23.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
  24. 24.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 17;
    coins = coins - 13;
    console.log(coins);
  25. 25.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 8;
    runs = runs - 4;
    console.log(runs);
  26. 26.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) 65 (b) 11 (c) Error
  28. 28.⚡ What number does this code print?
    let a = 39;
    let b = 10;
    console.log(a + b);
  29. 29.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 16;
    runs = runs - 1;
    console.log(runs);
  30. 30.⚡ What number does this code print?
    let score = 8;
    score = score + 20;
    score = score - 25;
    console.log(score);
  31. 31.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) Error (b) 13 (c) 67
  33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y);     (a) 7 (b) Error (c) 52
  34. 34.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
  35. 35.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 20;
    apples = apples - 38;
    console.log(apples);
  36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Well done, Meera! (b) name (c) Meera (d) Well done, name!
  37. 37.⚡ What number does this code print?
    let a = 31;
    let b = 1;
    console.log(a + b);
  38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 32 (b) Error (c) 5
  39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!");     (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
  40. 40.⚡ What number does this code print?
    let a = 45;
    let b = 15;
    console.log(a + b);

Answer key

  1. 38
  2. for
  3. if
  4. Welcome, Kabir!
  5. 13
  6. console.log()
  7. in the console
  8. <script>
  9. Hello, Riya!
  10. 51
  11. 14
  12. Hello, Arjun!
  13. a pop-up box
  14. alert()
  15. 16
  16. 28
  17. let
  18. Hello, Riya!
  19. Well done, Zoya!
  20. 9
  21. 86
  22. let
  23. 50
  24. 16
  25. 15
  26. 12
  27. 65
  28. 49
  29. 26
  30. 3
  31. Hello, Arjun!
  32. 67
  33. 52
  34. .js
  35. 5
  36. Well done, Meera!
  37. 32
  38. 32
  39. Hi, Aman!
  40. 60

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