JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 842 · 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 this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 18 (b) Error (c) 9
2. 2.⚡ What number does this code print?
   let runs = 15;
   runs = runs + 17;
   runs = runs - 6;
   console.log(runs);
3. 3.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 19;
   marks = marks - 6;
   console.log(marks);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) 12 (b) Error (c) 57
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 5;
   console.log(x + y); (a) Error (b) 55 (c) 10
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Meera! (c) Meera (d) name
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) Error (b) 17 (c) 8
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 7;
   console.log(x + y); (a) 47 (b) Error (c) 11
9. 9.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 37;
    let b = 14;
    console.log(a + b);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error
15. 15.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 83 (c) 11
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
19. 19.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) alert()
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
21. 21.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 8;
    coins = coins - 3;
    console.log(coins);
22. 22.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) if (d) for
23. 23.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 15;
    runs = runs - 4;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
26. 26.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
29. 29.⚡ What number does this code print?
    let books = 13;
    books = books + 5;
    books = books - 1;
    console.log(books);
30. 30.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) console.log()
31. 31.⚡ What number does this code print?
    let a = 48;
    let b = 9;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) 16 (c) Error
34. 34.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 6;
    marks = marks - 8;
    console.log(marks);
35. 35.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
36. 36.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 4;
    marks = marks - 2;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 13;
    runs = runs - 1;
    console.log(runs);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 24;
    let b = 15;
    console.log(a - b);

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