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True or False: India is one of the 17 megadiverse countries in the world.
- True
- False
Answer: True
India hosts ~7-8% of global species despite having 2.4% of land area. It has four biodiversity hotspots: Himalayas, Indo-Burma, Sundaland, Western Ghats. Important for environment and geography sections. [[MoEFCC Reports, NCERT Biology Class 12]]
True or False: A solution with pH less than 7 is basic.
- True
- False
Answer: False
pH < 7 indicates acidic solution; pH > 7 is basic; pH = 7 is neutral. pH scale measures hydrogen ion concentration. Fundamental for acid-base chemistry in exams. [[NCERT Chemistry Class 10]]
True or False: Decomposers like fungi and bacteria convert organic matter into inorganic nutrients.
- True
- False
Answer: True
Decomposers break down dead organisms, recycling nutrients (nitrogen, phosphorus) into soil for producers. This sustains ecosystem productivity and is vital for biogeochemical cycles. [[NCERT Biology Class 12]]
True or False: Convex lenses are used to correct myopia (nearsightedness).
- True
- False
Answer: False
Myopia is corrected using concave (diverging) lenses. Convex (converging) lenses correct hypermetropia (farsightedness). Understanding lens applications is essential for optics questions in exams. [[NCERT Physics Class 10]]
True or False: Wi-Fi uses radio waves for wireless communication.
- True
- False
Answer: True
Wi-Fi operates on 2.4 GHz or 5 GHz radio frequency bands to transmit data wirelessly between devices and routers. Understanding this helps in troubleshooting network issues and cybersecurity awareness. [[NCERT Computer Science]]
True or False: Rusting of iron is a physical change.
- True
- False
Answer: False
Rusting (formation of hydrated iron(III) oxide) is a chemical change involving oxidation of iron in presence of oxygen and water. It alters chemical composition, unlike physical changes like melting. Important for basic chemistry concepts. [[NCERT Chemistry Class 10]]
True or False: Prokaryotic cells have a well-defined nucleus.
- True
- False
Answer: False
Prokaryotes (e.g., bacteria) lack a membrane-bound nucleus; their DNA floats in the nucleoid region. Eukaryotes (plants, animals) have a true nucleus. This distinction is fundamental in biology classification. [[NCERT Biology Class 11]]
True or False: According to the second law of thermodynamics, entropy of an isolated system always decreases.
- True
- False
Answer: False
The second law states that entropy (disorder) of an isolated system never decreases; it either increases or remains constant. This explains irreversibility of natural processes and is fundamental in physics and engineering. [[NCERT Physics Class 11]]
True or False: Eutrophication is caused by excessive nitrogen and phosphorus in water bodies.
- True
- False
Answer: True
Eutrophication occurs when nutrient runoff (from fertilizers, sewage) causes algal blooms. Depleted oxygen levels from decomposing algae kill aquatic life. It's a major water pollution issue addressed in environmental policies. [[NCERT Biology Class 12, CPCB Reports]]
True or False: RAM is a type of non-volatile memory.
- True
- False
Answer: False
RAM (Random Access Memory) is volatile memory, meaning it loses stored data when power is turned off. Non-volatile memories like ROM, SSDs, or hard drives retain data without power. This distinction is critical in computer architecture. [[NCERT Computer Science]]
True or False: Mitochondrial DNA is inherited only from the father.
- True
- False
Answer: False
Mitochondrial DNA (mtDNA) is maternally inherited in humans. Sperm mitochondria are typically degraded after fertilization, so offspring inherit mtDNA exclusively from the mother. This is crucial for evolutionary studies and forensic analysis. [[NCERT Biology Class 12]]
True or False: The speed of light is maximum in glass compared to vacuum.
- True
- False
Answer: False
Light travels fastest in vacuum (≈3×10⁸ m/s). In denser media like glass, light slows down due to refraction, with speed reducing to about 2×10⁸ m/s. This principle is fundamental in optics. [[NCERT Physics Class 12]]
The Indian Constitution is the longest written constitution in the world.
- True
- False
Answer: True
The Indian Constitution is the longest written constitution globally, with 395 Articles and 12 Schedules originally (now over 470 Articles and 25 Parts after amendments). It draws from multiple global sources. [[30]]
The 'Dandi March' covered a distance of approximately 240 miles.
- True
- False
Answer: True
The Dandi March (Salt Satyagraha) began on March 12, 1930, with Gandhi walking 240 miles from Sabarmati Ashram to Dandi. He broke the salt law on April 6, launching the Civil Disobedience Movement. [[1]]
The 'Right to Information Act' was enacted in India in 2005.
- True
- False
Answer: True
The Right to Information Act was enacted in 2005, empowering citizens to seek information from public authorities. It promotes transparency, accountability, and participatory governance in democracy. [[1]]
The 'Demonetization' of ₹500 and ₹1000 notes was announced on November 8, 2016.
- True
- False
Answer: True
On November 8, 2016, the Government of India announced demonetization of ₹500 and ₹1000 currency notes to curb black money, counterfeit currency, and promote digital transactions. [[30]]
The '73rd and 74th Constitutional Amendments' (1992) gave constitutional status to Panchayats and Municipalities.
- True
- False
Answer: True
The 73rd Amendment (Panchayats) and 74th Amendment (Municipalities) in 1992 gave constitutional status to local self-government institutions, ensuring regular elections, reservations, and financial devolution. [[30]]
The 'Comptroller and Auditor General' (CAG) of India is appointed by the President.
- True
- False
Answer: True
The CAG of India is appointed by the President under Article 148 of the Constitution. The CAG audits government accounts and ensures financial accountability, acting as the guardian of public purse. [[1]]
The 'Kumbh Mela' was inscribed as UNESCO Intangible Cultural Heritage in 2017.
- True
- False
Answer: True
The Kumbh Mela, the world's largest religious gathering, was inscribed on UNESCO's Representative List of Intangible Cultural Heritage of Humanity in 2017, recognizing its cultural and spiritual significance. [[1]]
The 'Taj Mahal' was built by Shah Jahan as a mausoleum for his wife Mumtaz Mahal.
- True
- False
Answer: True
The Taj Mahal (1632-1653) in Agra was built by Mughal emperor Shah Jahan in memory of his wife Mumtaz Mahal. It is a UNESCO World Heritage Site and symbol of India's architectural heritage. [[30]]