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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 91 · 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 word makes a new variable? (a) give (b) let (c) put (d) make
  2. 2.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
  3. 3.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
  4. 4.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
  5. 5.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
  6. 6.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y);     (a) 14 (b) 59 (c) Error
  7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
  8. 8.⚡ What number does this code print?
    let a = 33;
    let b = 27;
    console.log(a + b);
  9. 9.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
  10. 10.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 17;
    coins = coins - 12;
    console.log(coins);
  11. 11.⚡ What number does this code print?
    let a = 21;
    let b = 24;
    console.log(a + b);
  12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) alert()
  13. 13.⚡ What number does this code print?
    let a = 53;
    let b = 17;
    console.log(a - b);
  14. 14.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 7;
    marks = marks - 23;
    console.log(marks);
  15. 15.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 11;
    apples = apples - 15;
    console.log(apples);
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y);     (a) Error (b) 9 (c) 63
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y);     (a) 52 (b) Error (c) 7
  18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
  19. 19.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
  20. 20.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y);     (a) 3 (b) 12 (c) Error
  22. 22.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
  23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
  24. 24.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
  25. 25.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
  26. 26.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
  27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y);     (a) Error (b) 4 (c) 22
  28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
  29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) Error (b) 14 (c) 5
  30. 30.⚡ What number does this code print?
    let score = 14;
    score = score + 19;
    score = score - 4;
    console.log(score);
  31. 31.⚡ What number does this code print?
    let a = 24;
    let b = 11;
    console.log(a - b);
  32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y);     (a) Error (b) 27 (c) 9
  33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
  34. 34.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
  35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
  36. 36.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a - b);
  37. 37.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 6;
    runs = runs - 12;
    console.log(runs);
  38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
  39. 39.⚡ What number does this code print?
    let a = 37;
    let b = 29;
    console.log(a + b);
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y);     (a) 69 (b) 15 (c) Error

Answer key

  1. let
  2. for
  3. a pop-up box
  4. alert()
  5. 45
  6. 59
  7. console.log()
  8. 60
  9. if
  10. 29
  11. 45
  12. let
  13. 36
  14. 7
  15. 6
  16. 63
  17. 52
  18. Welcome, Riya!
  19. .js
  20. Welcome, Aman!
  21. 12
  22. Well done, Zoya!
  23. Hello, Arjun!
  24. actions and changes
  25. 33
  26. <script>
  27. 22
  28. 30
  29. 14
  30. 29
  31. 13
  32. 27
  33. Hello, Riya!
  34. Hello, Kabir!
  35. Hello, Meera!
  36. 16
  37. 6
  38. Hello, Aman!
  39. 66
  40. 69

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