QUES: A solar chimney (or thermal chimney, in this context) is a passive solar ventilation system composed of a vertical shaft connecting the interior and exterior of a building. As the chimney warms, the air inside is heated causing an updraft that pulls air through the building. Performance can be improved by using glazing and thermal mass materials in a way that mimics greenhouses.
How can the performance of a solar chimney be improved?

ANS: by using glazing and thermal mass materials in a way that mimics greenhouses

QUES: Punjab (Urdu, Punjabi: , panj-ab, "five waters": listen (helpinfo)), also spelled Panjab, is the most populous of the four provinces of Pakistan. It has an area of 205,344 square kilometres (79,284 square miles) and a population of 91.379.615 in 2011, approximately 56% of the country's total population. Its provincial capital and largest city is Lahore. Punjab is bordered by the Indian states of Jammu and Kashmir to the northeast and Punjab and Rajasthan to the east. In Pakistan it is bordered by Sindh to the south, Balochistan and Khyber Pakhtunkhwa to the west, and Islamabad and Azad Kashmir to the north.
What is the population of Lahore?

ANS: unanswerable

QUES: Anthropologists have contributed to the debate by shifting the focus of research: One of the first challenges for the researcher wishing to carry out empirical research in this area is to identify an appropriate analytical tool. The concept of boundaries is useful here for demonstrating how identity works. In the same way as Barth, in his approach to ethnicity, advocated the critical focus for investigation as being "the ethnic boundary that defines the group rather than the cultural stuff that it encloses" (1969:15), social anthropologists such as Cohen and Bray have shifted the focus of analytical study from identity to the boundaries that are used for purposes of identification. If identity is a kind of virtual site in which the dynamic processes and markers used for identification are made apparent, boundaries provide the framework on which this virtual site is built. They concentrated on how the idea of community belonging is differently constructed by individual members and how individuals within the group conceive ethnic boundaries.
What did Barth shift the focus of?

ANS: unanswerable

QUES: Arguing against the absolutist position, Leibniz offers a number of thought experiments with the purpose of showing that there is contradiction in assuming the existence of facts such as absolute location and velocity. These arguments trade heavily on two principles central to his philosophy: the principle of sufficient reason and the identity of indiscernibles. The principle of sufficient reason holds that for every fact, there is a reason that is sufficient to explain what and why it is the way it is and not otherwise. The identity of indiscernibles states that if there is no way of telling two entities apart, then they are one and the same thing.
Which principles did Leibniz's arguments trade heavily upon?

ANS:
the principle of sufficient reason and the identity of indiscernibles