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JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 771 · 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 = 51;
    let b = 10;
    console.log(a + b);
  2. 2.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
  3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
  4. 4.⚡ What number does this code print?
    let a = 20;
    let b = 25;
    console.log(a + b);
  5. 5.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!");     (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
  6. 6.⚡ What number does this code print?
    let a = 36;
    let b = 10;
    console.log(a + b);
  7. 7.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!");     (a) name (b) Kabir (c) Welcome, name! (d) Welcome, Kabir!
  8. 8.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!");     (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
  9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
  10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) console.log()
  11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y);     (a) Error (b) 9 (c) 36
  12. 12.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 12;
    coins = coins - 8;
    console.log(coins);
  13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y);     (a) Error (b) 44 (c) 8
  14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
  15. 15.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
  16. 16.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 6;
    apples = apples - 25;
    console.log(apples);
  17. 17.⚡ Which JavaScript word repeats code? (a) for (b) let (c) if (d) console.log()
  18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!");     (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
  19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!");     (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
  20. 20.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
  21. 21.⚡ What number does this code print?
    let a = 19;
    let b = 12;
    console.log(a + b);
  22. 22.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
  23. 23.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
  24. 24.⚡ What number does this code print?
    let a = 30;
    let b = 2;
    console.log(a + b);
  25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y);     (a) 98 (b) 17 (c) Error
  26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y);     (a) 42 (b) 6 (c) Error
  27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!");     (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
  28. 28.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!");     (a) name (b) Kabir (c) Hello, name! (d) Hello, Kabir!
  29. 29.⚡ What number does this code print?
    let a = 5;
    let b = 11;
    console.log(a * b);
  30. 30.⚡ What number does this code print?
    let a = 15;
    let b = 33;
    console.log(a + b);
  31. 31.⚡ What number does this code print?
    let a = 48;
    let b = 6;
    console.log(a - b);
  32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 22;
    console.log(a + b);
  33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y);     (a) 11 (b) Error (c) 2
  34. 34.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 16;
    marks = marks - 5;
    console.log(marks);
  35. 35.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 5;
    apples = apples - 1;
    console.log(apples);
  36. 36.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!");     (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
  37. 37.⚡ What number does this code print?
    let score = 26;
    score = score + 16;
    score = score - 19;
    console.log(score);
  38. 38.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 13;
    coins = coins - 15;
    console.log(coins);
  39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y);     (a) Error (b) 89 (c) 17
  40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y);     (a) 10 (b) Error (c) 19

Answer key

  1. 61
  2. actions and changes
  3. alert()
  4. 45
  5. Well done, Riya!
  6. 46
  7. Welcome, Kabir!
  8. Hi, Riya!
  9. in the console
  10. if
  11. 36
  12. 23
  13. 44
  14. 108
  15. .js
  16. 0
  17. for
  18. Hello, Zoya!
  19. Hello, Aman!
  20. console.log()
  21. 31
  22. a pop-up box
  23. 24
  24. 32
  25. 98
  26. 42
  27. Hello, Aman!
  28. Hello, Kabir!
  29. 55
  30. 48
  31. 42
  32. 47
  33. 11
  34. 16
  35. 11
  36. Hi, Kabir!
  37. 23
  38. 21
  39. 89
  40. 19

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