Stored procedure for inserting data into table

I tried with your suggestion. The problem I have now is that 

SELECT ti.IdIntrebare AS IdIntrebare, @IdUserTest
		FROM (SELECT TOP 10 * FROM tblIntrebare ORDER BY NEWID()) ti JOIN tblRaspuns tr ON ti.IdIntrebare = tr.IdIntrebare JOIN tblProcedura tp ON ti.IdProcedura = tp.IdProcedura
		WHERE tp.Sectiune = 'GENERAL';

is not returning 10 questions. In the table I have almost 50 questions. Why?

Added the correct data type for the @Complexitate parameter. Can you try with this.

Thank you Anupam,

For the second block I try to insert 10 from GENERAL and 10 from SPECIFIC. And it should be random questions that's why I used ORDER BY NEWID()

Using only TOP 10 gives me first 10 questions in the table that meets condition, right?

The SELECT statements for both 'GENERAL' and 'SPECIFIC' conditions are the same in the second block. Can you try below?

CREATE PROCEDURE [dbo].[AddTestDetail]
    @IdUserTest INT,
    @Complexitate NVARCHAR(50)
AS
BEGIN
    IF (@Complexitate = 'GENERAL')
    BEGIN
        INSERT INTO tblTestDetail (IdIntrebare, IdUserTest)
        SELECT TOP 10 ti.IdIntrebare, @IdUserTest
        FROM tblIntrebare ti
        INNER JOIN tblRaspuns tr ON ti.IdIntrebare = tr.IdIntrebare
        INNER JOIN tblProcedura tp ON ti.IdProcedura = tp.IdProcedura
        WHERE tp.Sectiune = 'GENERAL';
    END
    ELSE IF (@Complexitate = 'SPECIFIC')
    BEGIN
        INSERT INTO tblTestDetail (IdIntrebare, IdUserTest)
        SELECT TOP 10 ti.IdIntrebare, @IdUserTest
        FROM tblIntrebare ti
        INNER JOIN tblRaspuns tr ON ti.IdIntrebare = tr.IdIntrebare
        INNER JOIN tblProcedura tp ON ti.IdProcedura = tp.IdProcedura
        WHERE tp.Sectiune = 'SPECIFIC';
    END
END

If it is working, Please accept my answer.