Saleha Pervez, Mansi Garg and, Poonam Singh Solutions for Chapter: Previous Year's Questions, Exercise 2: SOLVED PAPERS SET 2

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive and O positive. The blood group of the adopted son is_____.

The surface of a lake is frozen in severe winter but the water at its bottom is still liquid. What is the reason?

Microbial fuel cells are considered as a source of sustainable energy. Why?

1. They use living organisms as catalysts to generate electricity from certain substrates.

2. They use a variety of inorganic materials as substrates.

3. They can be installed in wastewater treatment plants to cleanse water and produce electricity.

Which of the statement(s) given above is/are correct?

The formation of the ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole?

The Constitution (73rd Amendment) Act, 1992, which aims at promoting the Panchayati Raj Institutions in the country, provides for which of the following?

1. Constitution of District Planning Committees.

2. State Election Commissions to conduct all Panchayat elections.

3. Establishment of State Finance Commissions.

Select the correct answer using the codes given below.

If a potato is placed on a pure paper plate that is white and unprinted and put in a microwave oven, the potato heats up, but the paper plate does not. This is because of _____.

Which one of the following reflects back more sunlight as compared to the other three?

What is the principle by which a cooling system (Radiator) in a motor car works?