Questions requiring some degree of mental activity, such as evaluating choices, voicing opinions, recalling past experiences, indicating intentions, or responding to "what if" questions, are placed deeper in the survey are .

Scaled response questions

Explanation:

SCALED RESPONSE QUESTIONS requires some degree of mental activity, such as evaluating choices, voicing opinions, recalling past experiences, indicating intentions, or responding to "what if" questions, are placed deeper in the survey.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.