A) The investigator in this survey would be the members of the N S S unit of the school who are responsible for conducting the survey. They will be the ones collecting and analyzing the data. The respondents in this survey would be the students of the school who will be asked about the availability of internet facilities in their houses.

b) Two examples of two-way questions in the questionnaire used in the survey:

1. Do you have access to the internet at your home?
- Yes
- No

2. How frequently do you use the internet for your school work?
- Daily
- Weekly
- Monthly
- Rarely

Explanation:
Two-way questions are questions that have two possible answers. In the examples provided, the first question asks whether the student has access to the internet at home, and the respondent can choose between "Yes" or "No". This question helps determine the percentage of students who have internet access.

The second question asks about the frequency of internet usage for school work. The options provided are "Daily", "Weekly", "Monthly", and "Rarely". This question helps to understand how often students rely on the internet for their academic needs.

Two-way questions are straightforward and provide clear options for respondents to choose from, making it easier to collect and analyze data.

Two examples of multiple-choice questions in the questionnaire used in the survey:

1. Which device do you primarily use to access the internet?
- Smartphone
- Laptop/Computer
- Tablet
- Other (please specify)

2. What is the main reason for not having internet access at home?
- Lack of availability in the area
- Financial constraints
- Personal choice
- Other (please specify)

Explanation:
Multiple-choice questions provide a set of options for respondents to choose from. The first example asks about the primary device used to access the internet, providing options such as smartphone, laptop/computer, tablet, and an option to specify if the student uses any other device. This question helps gather data on the most commonly used devices for internet access among students.

The second example asks about the main reason for not having internet access at home, providing options such as lack of availability in the area, financial constraints, personal choice, and an option to specify any other reason. This question helps identify the barriers that prevent students from having internet access at home.

Multiple-choice questions allow for a range of options and provide a structured format for respondents to select their answers, making it easier to analyze the data and identify trends or patterns.