Want SQL command from current data to required data

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SQL-Server

MaxNumberofQuestions	QuestionNo	QuestionMarks	ChildQuestionNo	ChildQuestionMqrks	sub	ObtMarks	ChildObtMarks
4	2	20	1	5	001	NULL	3
4	2	20	2	5	001	NULL	3
4	2	20	3	5	001	NULL	5
4	2	20	4	5	001	NULL	1
4	2	20	5	5	001	NULL	1
4	2	20	6	5	001	NULL	3
2	4	10	1	5	001	NULL	5
2	4	10	2	5	001	NULL	1
2	4	10	3	5	001	NULL	1

Required data rows as per maxnumberofquestions

MaxNumberofQuestions	QuestionNo	QuestionMarks	ChildQuestionNo	ChildQuestionMqrks	sub	ObtMarks	ChildObtMarks
4	2	20	1	5	001	NULL	3
4	2	20	2	5	001	NULL	3
4	2	20	3	5	001	NULL	5
4	2	20	4	5	001	NULL	1
2	4	10	1	5	001	NULL	5
2	4	10	2	5	001	NULL	1

What I have tried:

plz help me to get the required result by using sql query thanks