JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 185 · 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 does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
2. 2.⚡ What number does this code print?
   let score = 13;
   score = score + 10;
   score = score - 17;
   console.log(score);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
4. 4.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 11;
   runs = runs - 9;
   console.log(runs);
5. 5.⚡ What number does this code print?
   let a = 35;
   let b = 34;
   console.log(a - b);
6. 6.⚡ What number does this code print?
   let a = 39;
   let b = 8;
   console.log(a - b);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
8. 8.⚡ 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
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) 10 (b) 19 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
12. 12.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 19;
    runs = runs - 23;
    console.log(runs);
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Arjun! (d) Arjun
14. 14.⚡ What number does this code print?
    let a = 56;
    let b = 3;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
16. 16.⚡ What number does this code print?
    let a = 28;
    let b = 18;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Riya! (d) Riya
18. 18.⚡ What number does this code print?
    let books = 18;
    books = books + 12;
    books = books - 24;
    console.log(books);
19. 19.⚡ What number does this code print?
    let books = 13;
    books = books + 6;
    books = books - 9;
    console.log(books);
20. 20.⚡ What number does this code print?
    let a = 8;
    let b = 9;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let books = 22;
    books = books + 20;
    books = books - 30;
    console.log(books);
22. 22.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
23. 23.⚡ What number does this code print?
    let a = 44;
    let b = 7;
    console.log(a + b);
24. 24.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) console.log()
25. 25.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 3;
    apples = apples - 5;
    console.log(apples);
26. 26.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
27. 27.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
28. 28.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) 87 (c) Error
30. 30.⚡ What number does this code print?
    let a = 45;
    let b = 29;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) Error (c) 54
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 3;
    apples = apples - 9;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 13;
    coins = coins - 33;
    console.log(coins);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 5;
    marks = marks - 13;
    console.log(marks);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) 61 (c) Error
40. 40.⚡ What number does this code print?
    let score = 25;
    score = score + 6;
    score = score - 20;
    console.log(score);

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