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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 929 · 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.⚡ What number does this code print?
    let a = 32;
    let b = 7;
    console.log(a + b);
  2. 2.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
  3. 3.⚡ What number does this code print?
    let score = 16;
    score = score + 10;
    score = score - 24;
    console.log(score);
  4. 4.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
  5. 5.⚡ What number does this code print?
    let a = 44;
    let b = 33;
    console.log(a - b);
  6. 6.⚡ What number does this code print?
    let a = 2;
    let b = 11;
    console.log(a * b);
  7. 7.⚡ What number does this code print?
    let a = 27;
    let b = 12;
    console.log(a - b);
  8. 8.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 7;
    apples = apples - 23;
    console.log(apples);
  9. 9.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) console.log()
  10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) if
  11. 11.⚡ 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
  12. 12.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
  13. 13.⚡ What number does this code print?
    let a = 54;
    let b = 21;
    console.log(a - b);
  14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!");     (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
  15. 15.⚡ What number does this code print?
    let a = 14;
    let b = 9;
    console.log(a + b);
  16. 16.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
  17. 17.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
  18. 18.⚡ What number does this code print?
    let a = 26;
    let b = 21;
    console.log(a + b);
  19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y);     (a) 16 (b) 88 (c) Error
  20. 20.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
  21. 21.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
  22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
  23. 23.⚡ What number does this code print?
    let a = 19;
    let b = 2;
    console.log(a + b);
  24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) Error (b) 5 (c) 32
  25. 25.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a - b);
  26. 26.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
  27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
  28. 28.⚡ What number does this code print?
    let a = 19;
    let b = 35;
    console.log(a + b);
  29. 29.⚡ What number does this code print?
    let score = 24;
    score = score + 12;
    score = score - 21;
    console.log(score);
  30. 30.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
  31. 31.⚡ What number does this code print?
    let score = 13;
    score = score + 2;
    score = score - 4;
    console.log(score);
  32. 32.⚡ What number does this code print?
    let a = 27;
    let b = 16;
    console.log(a - b);
  33. 33.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) name (b) Hello, name! (c) Hello, Arjun! (d) Arjun
  34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!");     (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y);     (a) 13 (b) 67 (c) Error
  36. 36.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
  37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!");     (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
  38. 38.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
  39. 39.⚡ 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
  40. 40.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 13;
    apples = apples - 26;
    console.log(apples);

Answer key

  1. 39
  2. let
  3. 2
  4. console.log()
  5. 11
  6. 22
  7. 15
  8. 11
  9. if
  10. alert()
  11. 51
  12. let
  13. 33
  14. Well done, Riya!
  15. 23
  16. Well done, Aman!
  17. in the console
  18. 47
  19. 88
  20. a pop-up box
  21. 88
  22. Welcome, Riya!
  23. 21
  24. 32
  25. 1
  26. 20
  27. 60
  28. 54
  29. 15
  30. <script>
  31. 11
  32. 11
  33. Hello, Arjun!
  34. Hello, Arjun!
  35. 67
  36. actions and changes
  37. Welcome, Zoya!
  38. .js
  39. 14
  40. 7

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