in DBHelper you will not have ApplicationContext till you don't pass it.
instead of this do one thing make a static String in your Application class and use it. as Application class is a single ton instance which remains in memory till the end so it will not use much memory.
public class Question extends Application{
public static String check = "";
}
Retrieval of the value
public class DBHelper {
public method() {
String check = Question.check;
}
}