12th Physics - Book Back Answers - Unit 11 Recent Developments In Physics

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Tamil Nadu Board 12th Standard Physics - Unit 11: Book Back Answers and Solutions

This post covers the book back answers and solutions for Unit 11 from the Tamil Nadu State Board 12th Standard Physics textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

By going through this material, you’ll gain a strong understanding of Unit 11 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
2 Mark Questions: Answer briefly
3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 12 students! Prepare well and aim for top scores. Thank you!

I. Multiple choice questions.

1. The particle size of ZnO material is 30 nm. Based on the dimension it is classified as
a) Bulk material
b) Nanomaterial
c) Soft material
d) Magnetic material

Answer Key:

b) Nanomaterial

2. Which one of the following is the natural nanomaterial.
a) Peacock feather
b) Peacock beak
c) Grain of sand
d) Skin of the Whale

Answer Key:

a) Peacock feather

3. The blue print for making ultra durable synthetic material is mimicked from
a) Lotus leaf
b) Morpho butterfly
c) Parrot fish
d) Peacock feather

Answer Key:

c) Parrot fish

4. The method of making nanomaterial by assembling the atoms is called
a) Top down approach
b) Bottom up approach
c) Cross down approach
d) Diagonal approach

Answer Key:

b) Bottom up approach

5. “Ski wax” is an application of nano product in the field of
a) Medicine
b) Textile
c) Sports
d) Automotive industry

Answer Key:

c) Sports

6. The materials used in Robotics are

a) Aluminium and silver
b) Silver and gold
c) Copper and gold
d) Steel and aluminum

Answer Key:

d) Steel and aluminum

7. The alloys used for muscle wires in Robots are
a) Shape memory alloys
b) Gold copper alloys
c) Gold silver alloys
d) Two dimensional alloys

Answer Key:

a) Shape memory alloys

8. The technology used for stopping the brain from processing pain is
a) Precision medicine
b) Wireless brain sensor
c) Virtual reality
d) Radiology

Answer Key:

c) Virtual reality

9. The particle which gives mass to protons and neutrons are
a) Higgs particle
b) Einstein particle
c) Nanoparticle
d) Bulk particle

Answer Key:

a) Higgs particle

10. The gravitational waves were theoretically proposed by
a) Conrad Rontgen
b) Marie Curie
c) Albert Einstein
d) Edward Purcell

Answer Key:

c) Albert Einstein

II. Short answer questions.

12th Physics

III. Long answer questions.

12th Physics

IV. Exercises.

12th Physics