Create a custom practice set
Pick category, difficulty, number of questions, and time limit. Start instantly with your own quiz.
Generate QuizGK Questions
Filter by category, type, and difficulty. Reading is open for everyone.
True or False: At equilibrium, the forward and reverse reaction rates are zero.
- True
- False
Answer: False
At dynamic equilibrium, forward and reverse rates are equal (not zero), so concentrations remain constant. Reactions continue but with no net change. Key concept in chemical kinetics. [[NCERT Chemistry Class 11]]
IoT stands for:
- Internet of Technology
- Internet of Things
- Integration of Tools
- Interface of Tasks
Answer: Internet of Things
IoT refers to interconnected devices (sensors, appliances) exchanging data via internet. Applications include smart homes, healthcare, agriculture. Emerging topic for tech awareness. [[NITI Aayog Reports]]
Ohm's law states that V = I × ________.
- Power
- Resistance
- Capacitance
- Inductance
Answer: Resistance
Ohm's Law: Voltage (V) = Current (I) × Resistance (R). Valid for ohmic conductors at constant temperature. Foundation for circuit analysis. [[NCERT Physics Class 10]]
True or False: Meiosis results in four genetically identical daughter cells.
- True
- False
Answer: False
Meiosis produces four genetically unique haploid cells (gametes) due to crossing over and independent assortment. Mitosis produces two identical diploid cells. Critical for genetics. [[NCERT Biology Class 11]]
Which vitamin is water-soluble?
- Vitamin A
- Vitamin D
- Vitamin K
- Vitamin C
Answer: Vitamin C
Vitamin C (ascorbic acid) and B-complex vitamins are water-soluble; excess is excreted in urine. Vitamins A, D, E, K are fat-soluble and stored in liver. Important for nutrition questions. [[NCERT Chemistry Class 12]]
Planting trees in rows to reduce wind speed and prevent soil erosion is called ________.
- Contour ploughing
- Terracing
- Shelter belts
- Crop rotation
Answer: Shelter belts
Shelter belts (windbreaks) are rows of trees/shrubs that reduce wind erosion, conserve moisture, and protect crops. Part of sustainable agriculture practices. [[NCERT Geography Class 11, MoA Reports]]
True or False: The pitch of sound depends on its amplitude.
- True
- False
Answer: False
Pitch depends on frequency (higher frequency = higher pitch). Amplitude determines loudness. Confusing these is a common exam trap. [[NCERT Physics Class 9]]
Organisms that prepare their own food are called:
- Heterotrophs
- Autotrophs
- Saprotrophs
- Parasites
Answer: Autotrophs
Autotrophs (e.g., plants, cyanobacteria) synthesize organic compounds from inorganic sources via photosynthesis/chemosynthesis. They form the base of food chains. Basic ecology concept. [[NCERT Biology Class 12]]
The element responsible for the hardness of diamond is ________.
- Silicon
- Carbon
- Boron
- Nitrogen
Answer: Carbon
Diamond is an allotrope of carbon with tetrahedral sp³ hybridization, forming a rigid 3D network. This structure gives extreme hardness. Graphite is another carbon allotrope with different properties. [[NCERT Chemistry Class 11]]
True or False: Blockchain technology is primarily used for cryptocurrency transactions only.
- True
- False
Answer: False
While Bitcoin popularized blockchain, its applications include supply chain tracking, voting systems, healthcare records, and smart contracts. Decentralized ledger technology has broad utility. [[NITI Aayog Reports]]
Total internal reflection occurs when light travels from:
- Rarer to denser medium
- Denser to rarer medium
- Vacuum to glass
- Air to water
Answer: Denser to rarer medium
When light moves from denser (e.g., glass) to rarer medium (e.g., air) at angle > critical angle, it reflects entirely back. Used in optical fibers, prisms. Fundamental optics principle. [[NCERT Physics Class 12]]
The hormone insulin is secreted by the ________ of pancreas.
- Alpha cells
- Beta cells
- Delta cells
- Acinar cells
Answer: Beta cells
Pancreatic beta cells (in Islets of Langerhans) secrete insulin, which lowers blood glucose by facilitating cellular uptake. Deficiency causes diabetes mellitus. Key physiology concept. [[NCERT Biology Class 11]]
True or False: EDTA is a monodentate ligand.
- True
- False
Answer: False
EDTA (ethylenediaminetetraacetate) is a hexadentate ligand, forming six coordinate bonds with metal ions. Used in chelation therapy and water softening. Important for advanced chemistry. [[NCERT Chemistry Class 12]]
How many Sustainable Development Goals (SDGs) were adopted by UN in 2015?
- 15
- 17
- 20
- 25
Answer: 17
The UN's 2030 Agenda has 17 SDGs with 169 targets addressing poverty, inequality, climate change, etc. India actively participates in SDG implementation. Crucial for current affairs. [[NITI Aayog SDG Reports, NCERT Geography Class 11]]
The SI unit of luminous intensity is ________.
- Lumen
- Lux
- Candela
- Watt
Answer: Candela
Candela (cd) is one of seven SI base units, measuring luminous intensity in a given direction. Lumen measures total luminous flux; lux measures illuminance. Important for photometry. [[NCERT Physics Class 11]]
True or False: Oxygen released during photosynthesis comes from water molecules.
- True
- False
Answer: True
In light-dependent reactions, water photolysis splits H₂O into O₂, protons, and electrons. The O₂ is released as byproduct. Confirmed by isotopic labeling experiments. [[NCERT Biology Class 11]]
The rate of a chemical reaction doubles for every 10°C rise in temperature. This is described by:
- Arrhenius equation
- Le Chatelier's principle
- Hardy-Schulze rule
- Van't Hoff rule
Answer: Van't Hoff rule
Van't Hoff approximation states reaction rate roughly doubles per 10°C temperature increase. Arrhenius equation gives precise temperature dependence. Important for kinetics problems. [[NCERT Chemistry Class 12]]
Biogas primarily consists of ________ and carbon dioxide.
- Hydrogen
- Methane
- Oxygen
- Nitrogen
Answer: Methane
Biogas (from anaerobic digestion of organic waste) contains 50-75% methane (CH₄), a clean fuel. Promoted under GOBAR-DHAN scheme for rural energy and waste management. [[MNRE Reports, NCERT Chemistry Class 11]]
True or False: Bernoulli's principle states that pressure increases with increase in fluid speed.
- True
- False
Answer: False
Bernoulli's principle: in a flowing fluid, pressure decreases as speed increases (conservation of energy). Explains airplane lift, venturi effect. Common misconception in exams. [[NCERT Physics Class 11]]
Which cells produce antibodies in the human body?
- Red blood cells
- Platelets
- B-lymphocytes
- T-lymphocytes
Answer: B-lymphocytes
B-cells (B-lymphocytes) differentiate into plasma cells that secrete antibodies specific to antigens. T-cells assist in cell-mediated immunity. Central to adaptive immune response. [[NCERT Biology Class 12]]