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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]]
1 Byte equals ________ bits.
- 4
- 8
- 16
- 32
Answer: 8
1 Byte = 8 bits (binary digits). This standard unit conversion is essential for understanding computer memory, data transfer rates, and digital storage concepts. [[NCERT Computer Science]]
True or False: Like magnetic poles attract each other.
- True
- False
Answer: False
Like poles (N-N or S-S) repel; unlike poles (N-S) attract. This fundamental law of magnetism applies to bar magnets, electromagnets, and Earth's magnetic field. [[NCERT Physics Class 10]]
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 number of protons in an atom determines its ________ number.
- Mass
- Atomic
- Neutron
- Electron
Answer: Atomic
Atomic number (Z) = proton count, defining an element's identity and position in periodic table. Mass number = protons + neutrons. Foundational concept in chemistry. [[NCERT Chemistry Class 11]]
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]]
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]]
The tiny air sacs in lungs where gas exchange occurs are called ________.
- Bronchi
- Bronchioles
- Alveoli
- Trachea
Answer: Alveoli
Alveoli are microscopic sacs surrounded by capillaries. Oxygen diffuses into blood, CO₂ diffuses out. Their large surface area (~70 m²) enables efficient respiration. Key anatomy concept. [[NCERT Biology Class 11]]
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]]
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]]
The value of acceleration due to gravity (g) on Earth's surface is approximately ________ m/s².
- 8.9
- 9.8
- 10.2
- 11.0
Answer: 9.8
Standard gravity (g) is 9.8 m/s², varying slightly with altitude and latitude. It's derived from Newton's law of gravitation (g = GM/R²). Essential for mechanics problems in physics. [[NCERT Physics Class 11]]
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]]
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]]
The Paris Agreement aims to limit global warming to well below ________°C above pre-industrial levels.
- 1.5
- 2.0
- 2.5
- 3.0
Answer: 2.0
The 2015 Paris Agreement targets limiting global temperature rise to well below 2°C, preferably 1.5°C, to mitigate climate change impacts. India is a signatory committed to Nationally Determined Contributions (NDCs). [[UNFCCC, NCERT Geography Class 11]]
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]]
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 functional group -COOH is characteristic of ________ acids.
- Amino
- Carboxylic
- Fatty
- Mineral
Answer: Carboxylic
Carboxylic acids contain the carboxyl group (-COOH), which imparts acidic properties. Examples include acetic acid (vinegar) and citric acid. This group is central to organic chemistry reactions and biochemistry. [[NCERT Chemistry Class 12]]
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]]
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]]
The process by which plants lose water vapor through stomata is called ________.
- Photosynthesis
- Respiration
- Transpiration
- Guttation
Answer: Transpiration
Transpiration is the evaporation of water from plant leaves via stomata. It aids in water uptake, nutrient transport, and cooling. Excessive transpiration can cause wilting. Key concept in botany. [[NCERT Biology Class 11]]