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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 197 · 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.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
  2. 2.⚡ What number does this code print?
    let a = 45;
    let b = 26;
    console.log(a - b);
  3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
  4. 4.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 3;
    apples = apples - 1;
    console.log(apples);
  5. 5.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y);     (a) 15 (b) 69 (c) Error
  6. 6.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
  7. 7.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
  8. 8.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) let (d) for
  9. 9.⚡ What number does this code print?
    let a = 24;
    let b = 18;
    console.log(a + b);
  10. 10.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) for
  11. 11.⚡ 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
  12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
  13. 13.⚡ What number does this code print?
    let a = 28;
    let b = 3;
    console.log(a + b);
  14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y);     (a) Error (b) 72 (c) 9
  15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 24;
    console.log(a + b);
  16. 16.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
  17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!");     (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
  18. 18.⚡ What number does this code print?
    let score = 8;
    score = score + 6;
    score = score - 3;
    console.log(score);
  19. 19.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
  20. 20.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 20;
    apples = apples - 3;
    console.log(apples);
  21. 21.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 2;
    apples = apples - 3;
    console.log(apples);
  22. 22.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) let
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y);     (a) 56 (b) Error (c) 11
  24. 24.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
  25. 25.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 2;
    runs = runs - 1;
    console.log(runs);
  26. 26.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
  27. 27.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
  28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) Error (b) 51 (c) 6
  29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
  30. 30.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
  31. 31.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) if
  32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
  33. 33.⚡ What number does this code print?
    let a = 31;
    let b = 15;
    console.log(a + b);
  34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Well done, Zoya! (b) Zoya (c) Well done, name! (d) name
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y);     (a) 15 (b) 78 (c) Error
  36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y);     (a) Error (b) 43 (c) 7
  38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
  39. 39.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 9;
    marks = marks - 9;
    console.log(marks);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) Error (b) 67 (c) 13

Answer key

  1. .js
  2. 19
  3. <script>
  4. 22
  5. 69
  6. Welcome, Riya!
  7. Welcome, Meera!
  8. for
  9. 42
  10. let
  11. in the console
  12. Well done, Kabir!
  13. 31
  14. 72
  15. 33
  16. a pop-up box
  17. Hello, Kabir!
  18. 11
  19. 36
  20. 33
  21. 5
  22. console.log()
  23. 56
  24. Hello, Riya!
  25. 21
  26. 40
  27. if
  28. 51
  29. 30
  30. let
  31. alert()
  32. Hi, Aman!
  33. 46
  34. Well done, Zoya!
  35. 78
  36. Hello, Aman!
  37. 43
  38. 10
  39. 12
  40. 67

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