GK: Class 12 General Q&A · Page 48
3,658 free answers on GK (General) for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- GeneralClass 12All
How small is an atom?
An atom is about 0.1 nanometers wide, which is one ten-billionth of a meter. Millions of atoms placed side by side would equal the thickness of a human hair. Atoms are far too small to be seen with optical microscopes. Scientists use advanced instruments like electron microscopes to study atomic structures.
- GeneralClass 12All
What are the five atomic models?
The five atomic models commonly taught are Dalton’s solid sphere model, Thomson’s plum pudding model, Rutherford’s nuclear model, Bohr’s planetary model, and the quantum mechanical model. Each model represents a step forward in scientific understanding. Together, they show how atomic theory evolved through experimentation and improved evidence.
- GeneralClass 12All
How many atoms are in the human body?
The human body contains approximately 7 × 10²⁷ atoms. This enormous number comes from the atoms present in water, proteins, fats, and other biological molecules. Most of these atoms are hydrogen, oxygen, carbon, and nitrogen. This highlights how incredibly small atoms are and how complex the human body is at the atomic level.
- GeneralClass 12All
Who defined an atom?
Democritus first described the atom as an indivisible particle, but this idea lacked experimental support. It was more philosophical than scientific. John Dalton later defined the atom scientifically, based on experiments. His definition formed the foundation of modern atomic theory used in chemistry today.
- GeneralClass 12All
Which is called an atom?
An atom is the smallest unit of an element that can exist independently while retaining that element’s chemical properties. Dividing an atom further breaks it into subatomic particles, which no longer represent the element. Atoms are the fundamental building blocks of matter. Every solid, liquid, and gas is made of atoms arranged in different ways.
- GeneralClass 12All
2 8 8 18 18 32 नियम क्या है?
यह नियम बताता है कि किसी परमाणु के विभिन्न कक्षों में अधिकतम कितने इलेक्ट्रॉन हो सकते हैं। पहले कक्ष में 2, दूसरे में 8, तीसरे में 8, और आगे के कक्षों में क्रमशः 18, 18 और 32 इलेक्ट्रॉन हो सकते हैं। यह नियम छात्रों को परमाणु संरचना और तत्वों की संयोजकता समझने में मदद करता है। यह रासायनिक बंधन और अभिक्रियाओं को समझने का एक सरल आधार प्रदान करता है।
- GeneralClass 12All
What do you mean by atomic?
Atomic refers to anything related to an atom, which is the smallest unit of matter that retains the identity and properties of an element. When scientists describe something as atomic, they are focusing on matter at its most fundamental physical level. Understanding atomic behavior explains why materials have specific properties such as hardness, conductivity, or reactivity. Atomic-level interactions are the basis of chemistry, physics, and many modern technologies, from batteries to
- GeneralClass 12All
Who named the atomic theory?
The concept of atoms was first proposed by the Greek philosopher Democritus, who used the term “atomos,” meaning indivisible. However, his idea was philosophical and not supported by experiments. The modern atomic theory was formally introduced and named by John Dalton in the early 1800s. Dalton used experimental evidence to explain how atoms combine, making atomic theory a scientific model rather than a philosophical idea.
- GeneralClass 12All
What is the 2 8 8 18 18 32 rule?
The 2-8-8-18-18-32 rule explains how electrons are arranged in different shells around an atom’s nucleus. Each shell has a maximum capacity: the first holds 2 electrons, the second 8, the third 8 (in basic models), followed by shells that can hold 18, 18, and 32 electrons. This rule is commonly used in early chemistry education to help students understand atomic structure and chemical behavior. It provides a simple way to predict valency and reactivity, even though advanced chem
- GeneralClass 12All
Who won Nair or Dyer
There appears to be confusion in this question, as no prominent historical legal case pitted someone named "Nair" directly against General Dyer. The Hunter Committee investigation (1919-1920) examined General Dyer's actions at Jallianwala Bagh, with various Indian and British lawyers presenting arguments. The committee's findings were mixed—General Dyer was removed from military service and his actions were criticized, but he never faced criminal prosecution. In terms of "winning," the
- GeneralClass 12All
What did Queen Elizabeth call Camilla
The relationship between Queen Elizabeth II and Camilla, now Queen Consort, evolved significantly over the years. Initially, when Camilla married Prince Charles in 2005, she was given the title "Duchess of Cornwall" rather than "Princess of Wales" out of respect for Diana's memory. The Queen referred to Camilla formally by her title in public contexts. Over time, as Camilla worked diligently in her royal duties and the Queen witnessed her positive influence on Charles, their relationship warm
- GeneralClass 12All
How accurate is Kesari 2
"Kesari" (2019), not "Kesari 2," is a Bollywood film starring Akshay Kumar that depicts the Battle of Saragarhi (1897), not directly related to Jallianwala Bagh. The film is based on the true story of 21 Sikh soldiers of the 36th Sikh Regiment who fought against approximately 10,000 Afghan tribesmen. While the core event—the heroic last stand at Saragarhi—is historically documented and the soldiers' bravery is recognized as one of the greatest last stands in military history, the
- GeneralClass 12All
Who was Elizabeth's first lover
Queen Elizabeth II's first and only romantic love was Prince Philip of Greece and Denmark, whom she met when she was just 13 years old in 1939. Elizabeth and Philip were introduced at the Royal Naval College in Dartmouth, and according to various accounts, including those from Elizabeth's governess Marion Crawford, the young princess was immediately smitten. Despite being third cousins (both great-great-grandchildren of Queen Victoria), their relationship developed through correspondence duri
- GeneralClass 12All
Why did the Queen sleep separately
Queen Elizabeth II and Prince Philip had separate bedrooms throughout much of their marriage, which was consistent with traditional upper-class British customs rather than any marital discord. This arrangement was standard among the British aristocracy and royal families, where couples having their own private spaces was considered normal and even practical. Separate sleeping quarters allowed each person personal space, accommodated different schedules, and provided privacy—particularly
- GeneralClass 12All
What is the history of Amritsar India
Amritsar, founded in 1577 by the fourth Sikh Guru, Guru Ram Das, holds profound religious, cultural, and historical significance in India. The city's name means "Pool of Nectar," derived from the sacred water body around which the magnificent Golden Temple (Harmandir Sahib) was built. Guru Arjan Dev, the fifth Sikh Guru, completed the temple in 1604 and installed the Guru Granth Sahib there, making Amritsar the spiritual and cultural center of Sikhism. The city's location in Punjab made it a
- GeneralClass 12All
What was Churchill's controversy with India
Winston Churchill's relationship with India was deeply controversial and marked by views that many historians consider racist and imperialist. He was a staunch opponent of Indian independence, famously declaring that he "hated Indians" and describing them as "a beastly people with a beastly religion." Churchill viewed the British Empire as a civilizing force and believed that Indians were incapable of self-governance. During World War II, as Prime Minister, his policies contributed to the Ben
- GeneralClass 12All
786 इस्लाम से कैसे संबंधित है
संख्या 786 इस्लामी परंपरा में "बिस्मिल्लाह अर-रहमान अर-रहीम" (अल्लाह के नाम से, जो परम दयालु और कृपाशील है) का अंकीय प्रतिनिधित्व है। यह अबजद अंक प्रणाली पर आधारित है, जो एक अरबी अंकीय प्रणाली है जहां प्रत्येक अरबी अक्षर को एक विशिष्ट संख्यात्मक मूल्य दिया जाता है। जब "बिस्मिल्लाह अर-रहमान अर-रहीम" के सभी अक्षरों के संख्यात्मक मूल्यों को जोड़ा जाता है, तो कुल योग 786 होता है। हालांकि, यह जानना महत्वपूर्ण है कि 786 का उपयोग विवादास्पद है और सभी मुसलमानों द्वारा स्वीकार नहीं किया जाता।
- GeneralClass 12All
13 मार्च 1940 को क्या हुआ था
13 मार्च 1940 को उधम सिंह ने लंदन के कैक्सटन हॉल में माइकल ओ'ड्वायर को गोली मारकर हत्या कर दी। यह घटना जलियांवाला बाग हत्याकांड का प्रतिशोध थी, जो ठीक 21 साल पहले 13 अप्रैल 1919 को हुआ था। ओ'ड्वायर उस समय पंजाब का लेफ्टिनेंट गवर्नर था और उसने जनरल डायर के क्रूर कार्यों का खुलकर समर्थन किया था। उधम सिंह ने एक पुस्तक में छिपाई गई रिवॉल्वर से ओ'ड्वायर पर गोलियां चलाईं, जो एक सभा में भाषण दे रहा था। इस हत्या ने दुनिया भर में सुर्खियां बटोरीं और भारतीय स्वतंत्रता संग्राम में एक महत्वपूर्ण
- GeneralClass 12All
What languages does Dr. Saifuddin speak
Dr. Mufaddal Saifuddin, the current spiritual leader of the Dawoodi Bohra community, is multilingual and speaks several languages fluently. He is proficient in Arabic, which is essential for Islamic scholarship and religious discourse, as the Quran and many Islamic texts are in Arabic. He also speaks Gujarati, which is the primary language of many Dawoodi Bohras, particularly those in India. Additionally, Dr. Saifuddin speaks Urdu, English, and has knowledge of Lisan al-Dawat, a unique dialec
- GeneralClass 12All
What is the real name of Udham Singh
Udham Singh's birth name was Sher Singh Sandhu. He was born on December 26, 1899, in the village of Sunam in the Sangrur district of Punjab (now in India). After his parents died when he was young, he and his elder brother Mukta Singh were sent to an orphanage run by the Central Khalsa Orphanage in Amritsar, where they were baptized as Sikhs in 1917. During this ceremony, Sher Singh was renamed Udham Singh and his brother became Sadhu Singh. Throughout his revolutionary life, Udham Si