Laravel configuration

Answer these 10 questions. There's no time limit.

Question #1 php artisan key:generate Typically, it generates a string of what length?
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Question #2 Let's say you have several languages folders like resources/lang/en and resources/lang/es. Where would the default language be set? In which file?
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Question #3 If we're using mail driver 'log', then the email texts instead of being sent will be ...
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Question #4 If you see an error "No supported encrypter found. The cipher and / or key length are invalid." - what command you need to launch?
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Question #5 Look at the snippet from config/services.php file. How can we access the Facebook URL value from anywhere in the code?
Code snippet
return [
    'facebook' => [
        'url' => 'https://www.facebook.com/some_username',
    ],
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Question #6 Default .env.example. What's XXXXXX?
Code snippet
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=homestead
DB_USERNAME=homestead
DB_PASSWORD=XXXXXX
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Question #7 To enable maintenance mode, simply execute this Artisan command:
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Question #8 When using the daily log mode (files like laravel-2017-10-09.log), Laravel by default will only retain X days of log files by default. X = ?
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Question #9 Where can you find a default timezone set?
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Question #10 Look at the code snippet. What function is used to check the environment?
Code snippet
if (XXXXXX(['local', 'staging'])) {
    // The environment is either local OR staging...
}
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