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По порядку... (но это НЕ все виды вопросов)

1.At the police station the boy couldN'T give a satisfactory explanation for his actions.
- Could the boy give a satisfactory explanation for his actions at the police station?
- Where couldn't the boy give a satistactory explations for his actions?
- Could the boy give a satisfactory explanations for his actions or did he fail to do so?
- At the police station the boy couldn't give a satisfactory explanation for his actions, could he?
> Who couldn't give a....(вопрос к подлежащему)
> I wonder if the boy could give a satisfactory explanation for his actions at the police station. (косвенный вопрос= вопрос в косвенной речи)

2. In some countries military service is compulsory.
- Is military service compulsory in some countries?
- Where is military service compulsory?
- Is military service compulsory in many or a few countries?
- In some countries military service is compulsory, isn't it?
> What is compulsory in some countries? (see # 1 explanation)
> I would like to know if military service is compulsory in some countries.(see # 1 explanation)

At the police station the boy could give a satisfactory explanation for his actions, couldn't he?
Could the boy give a satisfactory explanation for his actions at the police station?
Could the boy give a satisfactory explanation for his actions at the police station or at home?
Who could give a satisfactory explanation for his actions at the police station?

Is military service compulsory in some countries?
Where is military service compulsory?
Is military service compulsory in some or many countries?
In some countries military service is compulsory, isn't it?