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Which device converts mechanical energy into electrical energy?
- Motor
- Generator
- Transformer
- Inverter
Answer: Generator
Generators work on electromagnetic induction (Faraday's Law): rotating coil in magnetic field induces current. Motors do the reverse. Crucial for power generation concepts. [[NCERT Physics Class 10]]
Which color bin is used for biodegradable waste in India's segregation system?
- Green
- Blue
- Red
- Yellow
Answer: Green
As per Solid Waste Management Rules 2016: Green bin = wet/biodegradable waste (food scraps); Blue = dry/recyclable; Red = domestic hazardous. Important for civic awareness questions. [[MoHUA Guidelines, NCERT Geography Class 11]]
Which type of bond is formed by sharing of electrons between atoms?
- Ionic bond
- Covalent bond
- Metallic bond
- Hydrogen bond
Answer: Covalent bond
Covalent bonds involve electron sharing between non-metals (e.g., H₂O, CH₄). Ionic bonds transfer electrons (e.g., NaCl). Bond type determines compound properties. Advanced concept for competitive exams. [[NCERT Chemistry Class 11]]
In humans, fertilization typically occurs in the:
- Ovary
- Uterus
- Fallopian tube
- Cervix
Answer: Fallopian tube
Fertilization (sperm-egg fusion) happens in the ampulla region of fallopian tube. The zygote then implants in uterus. Critical for human reproduction topics. [[NCERT Biology Class 12]]
The commercial unit of electrical energy is:
- Joule
- Watt
- Kilowatt-hour
- Volt-ampere
Answer: Kilowatt-hour
1 kWh = energy consumed by a 1 kW device running for 1 hour = 3.6×10⁶ Joules. Electricity bills use kWh. Understanding units is crucial for numerical problems. [[NCERT Physics Class 10]]
Which of the following is NOT a type of machine learning?
- Supervised Learning
- Unsupervised Learning
- Reinforcement Learning
- Deterministic Learning
Answer: Deterministic Learning
Main ML types are supervised (labeled data), unsupervised (unlabeled patterns), and reinforcement (reward-based). 'Deterministic Learning' isn't a standard category; ML often deals with probabilistic outcomes. Emerging topic for tech-awareness sections. [[NITI Aayog Reports]]
Which state of matter has definite shape and volume?
- Solid
- Liquid
- Gas
- Plasma
Answer: Solid
Solids have fixed shape and volume due to strong intermolecular forces holding particles in fixed positions. Liquids have fixed volume but variable shape; gases have neither. Basic concept in matter classification. [[NCERT Chemistry Class 9]]
Which blood vessel carries oxygenated blood from the heart to the body?
- Pulmonary artery
- Pulmonary vein
- Aorta
- Vena cava
Answer: Aorta
The aorta is the main artery carrying oxygen-rich blood from the left ventricle to systemic circulation. Pulmonary artery carries deoxygenated blood to lungs. Critical for understanding human physiology. [[NCERT Biology Class 11]]
The rate of change of velocity is called:
- Speed
- Acceleration
- Momentum
- Force
Answer: Acceleration
Acceleration (a = Δv/Δt) measures how quickly velocity changes. It's a vector quantity with SI unit m/s². Negative acceleration is deceleration. Fundamental in kinematics for physics exams. [[NCERT Physics Class 9]]
Solar energy is converted into electrical energy using:
- Wind turbines
- Photovoltaic cells
- Hydroelectric dams
- Biogas plants
Answer: Photovoltaic cells
Photovoltaic (PV) cells in solar panels convert sunlight directly into electricity via the photovoltaic effect. This clean energy technology is promoted under India's National Solar Mission. [[MNRE Reports, NCERT Geography Class 11]]
Which metal is liquid at room temperature?
- Sodium
- Mercury
- Iron
- Aluminum
Answer: Mercury
Mercury (Hg) is the only metal liquid at standard room temperature (25°C) due to weak metallic bonding. It's used in thermometers, barometers, and electrical switches. Bromine is the only non-metal liquid at room temperature. [[NCERT Chemistry Class 10]]
Which disease is caused by the deficiency of Vitamin C?
- Rickets
- Scurvy
- Beri-Beri
- Night Blindness
Answer: Scurvy
Scurvy results from Vitamin C deficiency, causing weakened collagen synthesis, leading to bleeding gums, joint pain, and poor wound healing. Citrus fruits are rich sources of Vitamin C. Important for health-related exam questions. [[NCERT Biology Class 11]]
Sound waves cannot travel through:
- Solid
- Liquid
- Gas
- Vacuum
Answer: Vacuum
Sound requires a medium (solid, liquid, or gas) to propagate as mechanical waves. In vacuum, there are no particles to vibrate, so sound cannot travel. This explains why space is silent. [[NCERT Physics Class 9]]
Which of the following is a strong acid?
- Acetic Acid
- Citric Acid
- Hydrochloric Acid
- Carbonic Acid
Answer: Hydrochloric Acid
HCl completely dissociates in water into H⁺ and Cl⁻ ions, making it a strong acid. Weak acids like acetic acid only partially dissociate. Strong acids are highly corrosive and used in industrial processes. [[NCERT Chemistry Class 10]]
Which gas is primarily responsible for the greenhouse effect?
- Oxygen
- Nitrogen
- Carbon Dioxide
- Argon
Answer: Carbon Dioxide
CO₂ traps infrared radiation emitted by Earth's surface, preventing heat escape into space. While water vapor contributes most naturally, human activities have significantly increased CO₂ levels, accelerating global warming. [[IPCC Reports, NCERT Geography Class 11]]
Which part of the human brain is responsible for maintaining balance and posture?
- Cerebrum
- Cerebellum
- Medulla Oblongata
- Hypothalamus
Answer: Cerebellum
The cerebellum, located at the back of the brain, coordinates voluntary movements, maintains posture, and ensures balance. It receives sensory input and fine-tunes motor activities. [[NCERT Biology Class 11]]
Which battle is considered the foundation of British political power in India?
- Battle of Buxar
- Battle of Plassey
- Battle of Wandiwash
- Battle of Assaye
Answer: Battle of Plassey
The Battle of Plassey (1757) is considered the foundation of British political power in India. Robert Clive's victory over Siraj ud-Daulah enabled the East India Company to gain control of Bengal's revenues. [[1]]
Which amendment act abolished the 'Privy Purse' and privileges of former princely state rulers?
- 24th Amendment
- 26th Amendment
- 42nd Amendment
- 44th Amendment
Answer: 26th Amendment
The 26th Constitutional Amendment Act (1971) abolished the Privy Purse and privileges granted to former rulers of princely states under Article 291 and 362, fulfilling the constitutional promise of equality. [[30]]
The 'Goods and Services Tax' (GST) was implemented in India on:
- April 1, 2016
- July 1, 2017
- January 1, 2018
- April 1, 2019
Answer: July 1, 2017
GST was implemented on July 1, 2017, subsuming multiple indirect taxes into a unified tax system. It was a major economic reform aimed at creating a common national market and improving tax compliance. [[1]]
Which committee recommended the three-tier Panchayati Raj system?
- Ashok Mehta Committee
- Balwantrai Mehta Committee
- Sarkaria Commission
- L.M. Singhvi Committee
Answer: Balwantrai Mehta Committee
The Balwantrai Mehta Committee (1957) recommended the three-tier Panchayati Raj system (village, block, district levels) for democratic decentralization. Rajasthan was the first state to implement it in 1959. [[1]]