Every Book Back multiple-choice question from Recent Developments in Physics (12th Standard Physics, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
The particle size of ZnO material is 30 nm. Based on the dimension it is classified as
- A. Bulk material
- B. NanomaterialCorrect
- C. Soft material
- D. Magnetic material
Explanation. Materials having at least one dimension between one and one hundred nanometers are categorized as nanomaterials. Since the size of the given substance is thirty nanometers, it falls within this nanoscale definition.
Q2
Which one of the following is the natural nanomaterial.
- A. Peacock featherCorrect
- B. Peacock beak
- C. Grain of sand
- D. Skin of the Whale
Explanation. Nature contains many examples of nanoscale structures. The iridescent colors seen on a peacock feather are the result of light interacting with microscopic biological features at the nanometer level.
Q3
The blue print for making ultra durable synthetic material is mimicked from
- A. Lotus leaf
- B. Morpho butterfly
- C. Parrot fishCorrect
- D. Peacock feather
Explanation. Scientists often use biomimicry to develop new products. The exceptionally strong teeth of the parrot fish provide a biological model for creating synthetic materials with extreme durability and resistance to wear.
Q4
The method of making nanomaterial by assembling the atoms is called
- A. Top down approach
- B. Bottom up approachCorrect
- C. Cross down approach
- D. Diagonal approach
Explanation. Nanotechnology fabrication uses two main strategies. The bottom-up method involves the precise construction of materials by arranging individual atoms or molecules into larger, more complex structures.
Q5
“Ski wax” is an application of nano product in the field of
- A. Medicine
- B. Textile
- C. SportsCorrect
- D. Automotive industry
Explanation. Nanotechnology has diverse applications in various industries. In the sports sector, wax containing nanoscale components is used to coat skis, significantly reducing friction to improve speed and performance on snow.
Q6
The materials used in Robotics are
- A. Aluminium and silver
- B. Silver and gold
- C. Copper and gold
- D. Steel and aluminumCorrect
Explanation. Robots require construction materials that offer a balance between durability and weight. Manufacturers frequently use steel for its strength and aluminum for its lightweight properties to build robotic frames and components.
Q7
The alloys used for muscle wires in Robots are
- A. Shape memory alloysCorrect
- B. Gold copper alloys
- C. Gold silver alloys
- D. Two dimensional alloys
Explanation. Specialized metallic mixtures are used to create movement in robotic systems. Shape memory alloys are employed as muscle wires because they have the ability to return to a pre-defined shape after being deformed.
Q8
The technology used for stopping the brain from processing pain is
- A. Precision medicine
- B. Wireless brain sensor
- C. Virtual realityCorrect
- D. Radiology
Explanation. Advancements in technology have led to new medical diagnosis and therapy techniques. Virtual reality creates immersive simulations that distract patients, effectively preventing the brain from focusing on and processing pain signals.
Q9
The particle which gives mass to protons and neutrons are
- A. Higgs particleCorrect
- B. Einstein particle
- C. Nanoparticle
- D. Bulk particle
Explanation. In particle physics, mass is acquired through interactions with a specific fundamental field. The Higgs particle is the subatomic entity responsible for granting mass to several other fundamental particles, including protons and neutrons.
Q10
The gravitational waves were theoretically proposed by
- A. Conrad Rontgen
- B. Marie Curie
- C. Albert EinsteinCorrect
- D. Edward Purcell
Explanation. Scientific discoveries often follow theoretical predictions. Albert Einstein mathematically proposed the existence of ripples in the curvature of space-time, known as gravitational waves, a century before they were experimentally detected.
About these Recent Developments in Physics questions
These are the Book Back multiple-choice questions for Recent Developments in Physics from the Tamil Nadu State Board (Samacheer Kalvi) 12th Standard Physics syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Recent Developments in Physics?
This chapter has 10 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 12th Standard Physics MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Recent Developments in Physics book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
