← JavaScript basics lesson New set →

JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 223 · 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 JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) let
  2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
  3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
  4. 4.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
  5. 5.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y);     (a) 3 (b) 21 (c) Error
  6. 6.⚡ What number does this code print?
    let a = 37;
    let b = 10;
    console.log(a - b);
  7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
  8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) console.log() (d) if
  9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
  10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) alert()
  11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
  12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!");     (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
  13. 13.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
  14. 14.⚡ 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
  15. 15.⚡ 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
  16. 16.⚡ What number does this code print?
    let a = 54;
    let b = 5;
    console.log(a + b);
  17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!");     (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
  18. 18.⚡ What number does this code print?
    let score = 19;
    score = score + 2;
    score = score - 11;
    console.log(score);
  19. 19.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a + b);
  20. 20.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
  21. 21.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a + b);
  22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y);     (a) 9 (b) Error (c) 27
  23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!");     (a) Hello, Kabir! (b) Hello, name! (c) name (d) Kabir
  24. 24.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a + b);
  25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera
  26. 26.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
  27. 27.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
  28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y);     (a) 5 (b) 32 (c) Error
  29. 29.⚡ What number does this code print?
    let a = 5;
    let b = 35;
    console.log(a + b);
  30. 30.⚡ What number does this code print?
    let a = 37;
    let b = 6;
    console.log(a + b);
  31. 31.⚡ What number does this code print?
    let a = 48;
    let b = 2;
    console.log(a - b);
  32. 32.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 2;
    runs = runs - 5;
    console.log(runs);
  33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!");     (a) Welcome, Arjun! (b) Welcome, name! (c) name (d) Arjun
  34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y);     (a) Error (b) 11 (c) 2
  35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y);     (a) Error (b) 5 (c) 14
  36. 36.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
  37. 37.⚡ 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
  38. 38.⚡ What number does this code print?
    let a = 16;
    let b = 13;
    console.log(a - b);
  39. 39.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a - b);
  40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!");     (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name

Answer key

  1. for
  2. actions and changes
  3. alert()
  4. Hello, Aman!
  5. 21
  6. 27
  7. let
  8. if
  9. .js
  10. console.log()
  11. Hello, Zoya!
  12. Welcome, Riya!
  13. 20
  14. 88
  15. 22
  16. 59
  17. Hi, Riya!
  18. 10
  19. 14
  20. in the console
  21. 10
  22. 27
  23. Hello, Kabir!
  24. 8
  25. Welcome, Meera!
  26. a pop-up box
  27. let
  28. 32
  29. 40
  30. 43
  31. 46
  32. 11
  33. Welcome, Arjun!
  34. 11
  35. 14
  36. 4
  37. 43
  38. 3
  39. 2
  40. Well done, Kabir!

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids