http://samueleresca.net/2015/03/the-difference-between-iqueryable-and-ienumerable/

IQueryablevsIEnumerable\queryableTake.cs

public static IQueryable Take(this IQueryable source, int count)
        {
            if (source == null)
                throw Error.ArgumentNull("source");
            return source.Provider.CreateQuery(
            Expression.Call(
            null,
            ((MethodInfo)MethodBase.GetCurrentMethod()).MakeGenericMethod(typeof(TSource)),
            new Expression[] { source.Expression, Expression.Constant(count) }
            ));
        }