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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 247 · 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) put (b) give (c) let (d) make
  2. 2.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
  3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
  4. 4.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Zoya! (c) name (d) Zoya
  5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) alert()
  6. 6.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!");     (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
  7. 7.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!");     (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
  8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
  9. 9.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 6;
    coins = coins - 3;
    console.log(coins);
  10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
  11. 11.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
  12. 12.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
  13. 13.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 5;
    runs = runs - 2;
    console.log(runs);
  14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
  15. 15.⚡ What number does this code print?
    let a = 34;
    let b = 35;
    console.log(a + b);
  16. 16.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y);     (a) Error (b) 31 (c) 4
  18. 18.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) if (d) alert()
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y);     (a) Error (b) 12 (c) 75
  20. 20.⚡ What number does this code print?
    let a = 23;
    let b = 9;
    console.log(a - b);
  21. 21.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y);     (a) Error (b) 28 (c) 10
  23. 23.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
  24. 24.⚡ What number does this code print?
    let a = 42;
    let b = 38;
    console.log(a - b);
  25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
  26. 26.⚡ 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
  27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) name (b) Well done, Aman! (c) Aman (d) Well done, name!
  28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y);     (a) Error (b) 10 (c) 91
  29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y);     (a) 8 (b) 62 (c) Error
  30. 30.⚡ What number does this code print?
    let a = 23;
    let b = 29;
    console.log(a + b);
  31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
  32. 32.⚡ What number does this code print?
    let a = 53;
    let b = 11;
    console.log(a - b);
  33. 33.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
  34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!");     (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
  35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
  36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y);     (a) Error (b) 12 (c) 3
  37. 37.⚡ What number does this code print?
    let score = 8;
    score = score + 7;
    score = score - 13;
    console.log(score);
  38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) 67 (b) Error (c) 13
  40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 1;
    console.log(a + b);

Answer key

  1. let
  2. if
  3. <script>
  4. Hello, Zoya!
  5. let
  6. Well done, Arjun!
  7. Welcome, Aman!
  8. actions and changes
  9. 16
  10. .js
  11. for
  12. 16
  13. 12
  14. 14
  15. 69
  16. console.log()
  17. 31
  18. alert()
  19. 75
  20. 14
  21. Well done, Arjun!
  22. 28
  23. in the console
  24. 4
  25. 30
  26. 14
  27. Well done, Aman!
  28. 91
  29. 62
  30. 52
  31. Welcome, Zoya!
  32. 42
  33. 18
  34. Welcome, Arjun!
  35. Welcome, Riya!
  36. 12
  37. 2
  38. 18
  39. 67
  40. 37

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