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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 900 · 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) let (b) make (c) give (d) put
  2. 2.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!");     (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
  3. 3.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 9;
    marks = marks - 10;
    console.log(marks);
  4. 4.⚡ What number does this code print?
    let score = 23;
    score = score + 18;
    score = score - 16;
    console.log(score);
  5. 5.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
  6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
  7. 7.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
  8. 8.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 18;
    marks = marks - 2;
    console.log(marks);
  9. 9.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 18;
    coins = coins - 9;
    console.log(coins);
  10. 10.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
  11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!");     (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
  12. 12.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
  13. 13.⚡ What number does this code print?
    let a = 16;
    let b = 17;
    console.log(a + b);
  14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y);     (a) 82 (b) Error (c) 10
  15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
  16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
  17. 17.⚡ What number does this code print?
    let a = 17;
    let b = 12;
    console.log(a - b);
  18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
  19. 19.⚡ What number does this code print?
    let a = 28;
    let b = 4;
    console.log(a - b);
  20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
  21. 21.⚡ What number does this code print?
    let books = 12;
    books = books + 9;
    books = books - 1;
    console.log(books);
  22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
  23. 23.⚡ What number does this code print?
    let a = 52;
    let b = 21;
    console.log(a - b);
  24. 24.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) alert()
  25. 25.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) let
  26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
  27. 27.⚡ What number does this code print?
    let a = 43;
    let b = 32;
    console.log(a - b);
  28. 28.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
  29. 29.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!");     (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
  30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y);     (a) 19 (b) 10 (c) Error
  31. 31.⚡ What number does this code print?
    let books = 23;
    books = books + 10;
    books = books - 11;
    console.log(books);
  32. 32.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) for
  33. 33.⚡ What number does this code print?
    let books = 24;
    books = books + 7;
    books = books - 12;
    console.log(books);
  34. 34.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 13;
    apples = apples - 5;
    console.log(apples);
  35. 35.⚡ 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
  36. 36.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 6;
    apples = apples - 18;
    console.log(apples);
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y);     (a) 10 (b) 91 (c) Error
  38. 38.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
  39. 39.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
  40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);

Answer key

  1. let
  2. Hello, Kabir!
  3. 13
  4. 25
  5. let
  6. <script>
  7. Welcome, Aman!
  8. 21
  9. 36
  10. in the console
  11. Well done, Zoya!
  12. for
  13. 33
  14. 82
  15. Hello, Aman!
  16. 18
  17. 5
  18. 55
  19. 24
  20. Hello, Zoya!
  21. 20
  22. 9
  23. 31
  24. console.log()
  25. if
  26. Hello, Zoya!
  27. 11
  28. a pop-up box
  29. Hi, Arjun!
  30. 19
  31. 22
  32. alert()
  33. 19
  34. 30
  35. 43
  36. 12
  37. 91
  38. actions and changes
  39. Hello, Arjun!
  40. 20

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