JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 480 · 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 books = 14;
   books = books + 2;
   books = books - 16;
   console.log(books);
2. 2.⚡ What number does this code print?
   let a = 5;
   let b = 4;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let a = 12;
   let b = 12;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let coins = 23;
   coins = coins + 13;
   coins = coins - 29;
   console.log(coins);
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) for (d) console.log()
6. 6.⚡ What number does this code print?
   let books = 24;
   books = books + 13;
   books = books - 30;
   console.log(books);
7. 7.⚡ What number does this code print?
   let runs = 8;
   runs = runs + 12;
   runs = runs - 12;
   console.log(runs);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) let
9. 9.⚡ What number does this code print?
   let a = 2;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 17 (c) 98
12. 12.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) let
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error
15. 15.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) Error (c) 6
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
19. 19.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
20. 20.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a + b);
21. 21.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) 10 (c) Error
24. 24.⚡ What number does this code print?
    let score = 24;
    score = score + 10;
    score = score - 16;
    console.log(score);
25. 25.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 13;
    marks = marks - 33;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let books = 11;
    books = books + 5;
    books = books - 10;
    console.log(books);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Aman (d) Welcome, Aman!
29. 29.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 8 (c) 62
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 32;
    let b = 8;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 29;
    let b = 21;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 16;
    apples = apples - 22;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 15;
    coins = coins - 8;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let books = 21;
    books = books + 11;
    books = books - 9;
    console.log(books);

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