A polyhedron is said to be a truncated polyhedron when you cut across its original vertices to develop a new facet in place of each vertex or polytope vertex to be more specific. So in simple words, truncation is the process of cutting at vertices to produce new facets on the same polygon.

Depending on the depth of cut, where and how it is applied there are different types of truncation that can be applied on a polygon, Ex: Uniform, Shallow, Edge, Partial, etc.

You can refer this page on wikipedia for more info - https://en.wikipedia.org/wiki/Truncation_(geometry)

Use DQ Edge. attend mocktests and study the topics they suggest you to focus on. you will surely clear NATA in very short time.

Every year the colleges face a tough competition for best ranks, based on parameters like education, campus, faculty and placements (to name a few), and according to the latest ranking, here is a list of some of the best colleges you may want to apply.

1. School Of Planning And Architecture, Delhi

2. Indian Institute Of Technology, Kharagpur

3. Sir J. J. College Of Architecture, Mumbai

4. Birla Institute Of Technology, Mesra

5. Jadavpur University, Kolkata

6. Chandigarh College Of Architecture, Chandigarh

7. Jamia Milia Islamia University

8. National Institute Of Technology, Tiruchirapalli

9. Center for Environmental Planning and Technology University, Ahmedabad

10. Manipal Institute of Technology, Manipal

Generally, there is no much competition in this architecture field when compare with engineering.This field is perfect for those who are interested.And also its a different way to design our future.And don't worry about salary.Better to get seated in top colleges and better to get employed in top companies.

As per the information given in the NATA brochure you need to score a minimum of 50% marks in your 12th class exams with mathematics as your compulsory subject to apply for architecture colleges.

Answering to your second question

based on the total score you get ( 50% of 12th score + 50% of NATA score), ranks are given.I hope you got the answer.

Escalators are used for vertical cum horizontal movement. e

Elevators are used for vertical movement.

Effective strategies and techniques for preparation of Mathematics Topics.

1. Knowing the key concepts - Make sure your basic concepts of math are strong enough and learn all the formulas, identities and tables.Try to solve small calculations without pen-paper as it can improve your thinking and consume your time. Memorize area formulas for 2-Dimensional and 3-Dimensional figures. Focus on algebraic and Indices formulas. Remember important T-ratios (in Trigonometry) and their values. Remember Pythagoras Triplets.
2. Play with your strengths - Firstly, try to master all the topics that you are strong in, and later work on the weaker topics(by practicing more question).
3. Prepare your own notes - Make your own short cut tricks and notes, as self-prepared notes are the best trick to memories any subject.
4. Revision of errors - Errors give you an idea of knowing where you have done mistake. These let you understand and review the thing that left you back. This is also once again a kind of repetition and a practice.
5. Practice the questions based on each topic within the time limit provided(on edge.dqlabs.in). Also, go through all the past year papers and solve them thoroughly. Practice more and more. Try to attempt as many mock tests as possible. When you are left with handful of days to go, nothing will help you more than writing and analyzing Mock Tests.
6. Be confident with your preparation. While sitting in the exam, never pressurize yourself with time factor during initial stages – try to solve each question within 60 - 90 seconds of time. Read, understand and analyze the question/given data carefully and then solve.