JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 723 · 40 questions

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".

1. 1.⚡ What number does this code print?
   let a = 3;
   let b = 4;
   console.log(a * b);
2. 2.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
3. 3.⚡ What number does this code print?
   let a = 11;
   let b = 35;
   console.log(a + b);
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
5. 5.⚡ What number does this code print?
   let books = 6;
   books = books + 3;
   books = books - 3;
   console.log(books);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
8. 8.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) 54 (b) 9 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 77 (c) 14
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) let
13. 13.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
15. 15.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 16;
    apples = apples - 18;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) Error (c) 14
18. 18.⚡ What number does this code print?
    let a = 59;
    let b = 30;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) Error (c) 10
20. 20.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
21. 21.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
22. 22.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 14;
    coins = coins - 1;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 4;
    apples = apples - 9;
    console.log(apples);
24. 24.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) alert()
25. 25.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
26. 26.⚡ What number does this code print?
    let a = 32;
    let b = 17;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 3;
    marks = marks - 10;
    console.log(marks);
28. 28.⚡ 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
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
30. 30.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 15;
    coins = coins - 9;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 5;
    apples = apples - 6;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 3;
    coins = coins - 9;
    console.log(coins);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14
34. 34.⚡ What number does this code print?
    let a = 37;
    let b = 37;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 7;
    runs = runs - 18;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let score = 22;
    score = score + 17;
    score = score - 14;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 38;
    let b = 15;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 11;
    apples = apples - 22;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 13;
    apples = apples - 14;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let a = 53;
    let b = 39;
    console.log(a + b);

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