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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 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]]