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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 2 · 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 writes in the console? (a) alert() (b) let (c) if (d) console.log()
  2. 2.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
  3. 3.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
  4. 4.⚡ What number does this code print?
    let a = 54;
    let b = 32;
    console.log(a + b);
  5. 5.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y);     (a) 2 (b) Error (c) 11
  6. 6.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) if (d) for
  7. 7.⚡ What number does this code print?
    let score = 6;
    score = score + 2;
    score = score - 5;
    console.log(score);
  8. 8.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y);     (a) 9 (b) 54 (c) Error
  9. 9.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
  10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
  11. 11.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
  12. 12.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 4;
    runs = runs - 2;
    console.log(runs);
  13. 13.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
  14. 14.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
  15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y);     (a) 4 (b) 13 (c) Error
  16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y);     (a) Error (b) 98 (c) 17
  17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y);     (a) 94 (b) 13 (c) Error
  18. 18.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!");     (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
  19. 19.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
  20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y);     (a) 12 (b) 3 (c) Error
  21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y);     (a) 65 (b) Error (c) 11
  22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
  23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y);     (a) Error (b) 66 (c) 12
  24. 24.⚡ What number does this code print?
    let a = 36;
    let b = 8;
    console.log(a - b);
  25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y);     (a) 10 (b) 46 (c) Error
  26. 26.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 5;
    runs = runs - 8;
    console.log(runs);
  27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!");     (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
  28. 28.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
  29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!");     (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
  30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!");     (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
  31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
  32. 32.⚡ What number does this code print?
    let a = 44;
    let b = 4;
    console.log(a + b);
  33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!");     (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
  34. 34.⚡ What number does this code print?
    let a = 59;
    let b = 6;
    console.log(a + b);
  35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!");     (a) Hello, Arjun! (b) Arjun (c) Hello, name! (d) name
  36. 36.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
  37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y);     (a) Error (b) 33 (c) 6
  38. 38.⚡ What number does this code print?
    let a = 40;
    let b = 19;
    console.log(a + b);
  39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
  40. 40.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!");     (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!

Answer key

  1. console.log()
  2. let
  3. actions and changes
  4. 86
  5. 11
  6. alert()
  7. 3
  8. 54
  9. for
  10. .js
  11. let
  12. 24
  13. in the console
  14. if
  15. 13
  16. 98
  17. 94
  18. Well done, Aman!
  19. 24
  20. 12
  21. 65
  22. Hello, Zoya!
  23. 66
  24. 28
  25. 46
  26. 25
  27. Hello, Zoya!
  28. 33
  29. Hello, Riya!
  30. Welcome, Meera!
  31. 4
  32. 48
  33. Welcome, Kabir!
  34. 65
  35. Hello, Arjun!
  36. a pop-up box
  37. 33
  38. 59
  39. 24
  40. Well done, Kabir!

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