Here are the answers to your questions:
Q1. An image, perception or concept that is capable of measurement is called D. Variable.
Q2. In order to pursue the research, which of the following is priorly required? B. Formulating a research question.
Q3. What are the conditions in which Type-I error occurs? B. The null hypotheses get rejected even if it is true.
Q4. How to judge the depth of any research? C. By research objectives.