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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 577 · 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.⚡ 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
  2. 2.⚡ What number does this code print?
    let score = 14;
    score = score + 9;
    score = score - 2;
    console.log(score);
  3. 3.⚡ What number does this code print?
    let a = 18;
    let b = 22;
    console.log(a + b);
  4. 4.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
  5. 5.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
  6. 6.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
  7. 7.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y);     (a) Error (b) 18 (c) 9
  8. 8.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
  9. 9.⚡ What number does this code print?
    let a = 39;
    let b = 25;
    console.log(a - b);
  10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 12;
    console.log(a - b);
  11. 11.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!");     (a) Hello, Meera! (b) name (c) Meera (d) Hello, name!
  12. 12.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
  13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!");     (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
  14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!");     (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
  15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
  16. 16.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
  17. 17.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
  18. 18.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 14;
    coins = coins - 10;
    console.log(coins);
  19. 19.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
  20. 20.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 9;
    coins = coins - 22;
    console.log(coins);
  21. 21.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y);     (a) Error (b) 6 (c) 51
  23. 23.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
  24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y);     (a) 45 (b) 9 (c) Error
  25. 25.⚡ Which JavaScript word repeats code? (a) for (b) let (c) alert() (d) if
  26. 26.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 15;
    marks = marks - 40;
    console.log(marks);
  27. 27.⚡ What number does this code print?
    let a = 28;
    let b = 5;
    console.log(a - b);
  28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!");     (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
  29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!");     (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
  30. 30.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
  31. 31.⚡ What number does this code print?
    let a = 20;
    let b = 14;
    console.log(a + b);
  32. 32.⚡ What number does this code print?
    let a = 30;
    let b = 21;
    console.log(a - b);
  33. 33.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);
  34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y);     (a) 7 (b) Error (c) 25
  36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!");     (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
  37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) Zoya (b) Hello, name! (c) Hello, Zoya! (d) name
  38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y);     (a) Error (b) 15 (c) 87
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) 11 (b) Error (c) 65
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y);     (a) Error (b) 15 (c) 69

Answer key

  1. in the console
  2. 21
  3. 40
  4. let
  5. console.log()
  6. a pop-up box
  7. 18
  8. Hello, Arjun!
  9. 14
  10. 26
  11. Hello, Meera!
  12. let
  13. Well done, Meera!
  14. Well done, Zoya!
  15. <script>
  16. alert()
  17. .js
  18. 10
  19. Hello, Meera!
  20. 10
  21. Welcome, Kabir!
  22. 51
  23. if
  24. 45
  25. for
  26. 2
  27. 23
  28. Well done, Kabir!
  29. Well done, Zoya!
  30. actions and changes
  31. 34
  32. 9
  33. 28
  34. Well done, Riya!
  35. 25
  36. Hi, Meera!
  37. Hello, Zoya!
  38. 87
  39. 65
  40. 69

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