Q.1 Which element is essential for the production of thyroid hormones in humans?
Iron
Iodine
Calcium
Zinc
Explanation - Iodine is a key component of thyroid hormones, which regulate metabolism. A deficiency can lead to goiter.
Correct answer is: Iodine
Q.2 What is the primary purpose of CRISPR-Cas9 technology?
Energy storage
Gene editing
Antibiotic production
Data encryption
Explanation - CRISPR-Cas9 is a tool used to modify DNA sequences in organisms, allowing precise gene editing.
Correct answer is: Gene editing
Q.3 Which planet in our solar system has the shortest day?
Earth
Jupiter
Mars
Venus
Explanation - Jupiter completes one rotation on its axis in about 9.9 hours, making it the planet with the shortest day.
Correct answer is: Jupiter
Q.4 Which type of electromagnetic wave has the highest energy?
Radio waves
Microwaves
X-rays
Infrared
Explanation - X-rays have higher energy than microwaves, radio waves, and infrared due to their shorter wavelength and higher frequency.
Correct answer is: X-rays
Q.5 What is the function of mitochondria in a cell?
Protein synthesis
Energy production
Lipid storage
Genetic replication
Explanation - Mitochondria are known as the powerhouse of the cell because they produce ATP, the cell's energy currency.
Correct answer is: Energy production
Q.6 Which technology is commonly used for wireless internet connectivity?
Bluetooth
Wi-Fi
USB
Ethernet
Explanation - Wi-Fi uses radio waves to provide wireless internet access to devices within a network range.
Correct answer is: Wi-Fi
Q.7 Which of the following is NOT a greenhouse gas?
Carbon dioxide
Methane
Oxygen
Nitrous oxide
Explanation - Oxygen does not trap heat in the atmosphere like greenhouse gases such as CO2, methane, and nitrous oxide.
Correct answer is: Oxygen
Q.8 What is the SI unit of electric current?
Volt
Ampere
Ohm
Watt
Explanation - Electric current is measured in amperes (A), representing the flow of electric charge per second.
Correct answer is: Ampere
Q.9 Which of the following is a non-renewable energy resource?
Wind
Solar
Coal
Hydropower
Explanation - Coal is a fossil fuel and a non-renewable resource as it takes millions of years to form.
Correct answer is: Coal
Q.10 What does AI stand for in technology?
Automated Interface
Artificial Intelligence
Analog Integration
Advanced Internet
Explanation - AI refers to computer systems capable of performing tasks that usually require human intelligence.
Correct answer is: Artificial Intelligence
Q.11 Which device converts chemical energy into electrical energy?
Motor
Battery
Transformer
Generator
Explanation - Batteries store chemical energy and convert it into electrical energy when connected to a circuit.
Correct answer is: Battery
Q.12 Which branch of science deals with the study of viruses?
Bacteriology
Virology
Immunology
Mycology
Explanation - Virology is the study of viruses and virus-like agents, including their structure, classification, and evolution.
Correct answer is: Virology
Q.13 Which metal is liquid at room temperature?
Mercury
Iron
Gold
Aluminium
Explanation - Mercury is the only metal that is liquid at room temperature due to its low melting point (-38.83°C).
Correct answer is: Mercury
Q.14 What is the main function of DNA in living organisms?
Store energy
Provide structure
Store genetic information
Catalyze reactions
Explanation - DNA stores the hereditary information required for the growth, development, and reproduction of organisms.
Correct answer is: Store genetic information
Q.15 Which of the following is used as a fuel in nuclear reactors?
Uranium-235
Plutonium-239
Both A and B
Thorium-232
Explanation - Both Uranium-235 and Plutonium-239 are fissile materials used as fuel in nuclear reactors.
Correct answer is: Both A and B
Q.16 Which phenomenon explains why the sky appears blue?
Reflection
Refraction
Scattering
Diffraction
Explanation - Rayleigh scattering causes shorter wavelengths of light (blue) to scatter more than longer wavelengths, making the sky appear blue.
Correct answer is: Scattering
Q.17 Which technology is the basis of cryptocurrencies like Bitcoin?
Cloud computing
Blockchain
Artificial Intelligence
Quantum computing
Explanation - Blockchain is a decentralized ledger technology that records transactions securely, forming the basis of cryptocurrencies.
Correct answer is: Blockchain
Q.18 Which vitamin is produced in human skin when exposed to sunlight?
Vitamin A
Vitamin B12
Vitamin C
Vitamin D
Explanation - Vitamin D is synthesized in the skin when ultraviolet B (UVB) rays from the sun convert 7-dehydrocholesterol to cholecalciferol.
Correct answer is: Vitamin D
Q.19 Which type of lens is used to correct nearsightedness?
Convex lens
Concave lens
Cylindrical lens
Bifocal lens
Explanation - Concave lenses diverge light rays, helping correct nearsightedness (myopia) by focusing images properly on the retina.
Correct answer is: Concave lens
Q.20 Which of the following is considered a superconductor at very low temperatures?
Copper
Mercury
Iron
Aluminium
Explanation - Mercury exhibits superconductivity below its critical temperature of 4.2 K, allowing zero electrical resistance.
Correct answer is: Mercury
Q.21 Which part of the human eye controls the amount of light entering?
Cornea
Iris
Lens
Retina
Explanation - The iris adjusts the size of the pupil, regulating the amount of light that enters the eye.
Correct answer is: Iris
Q.22 Which of the following is the most abundant gas in Earth's atmosphere?
Oxygen
Nitrogen
Carbon dioxide
Argon
Explanation - Nitrogen makes up about 78% of Earth's atmosphere, followed by oxygen at roughly 21%.
Correct answer is: Nitrogen
Q.23 Which of these is NOT a type of RNA?
mRNA
tRNA
rRNA
dRNA
Explanation - There is no natural RNA called dRNA; mRNA, tRNA, and rRNA are the main types of RNA in cells.
Correct answer is: dRNA
Q.24 Which type of microscope uses electrons instead of light?
Compound microscope
Electron microscope
Stereoscope
Phase-contrast microscope
Explanation - Electron microscopes use beams of electrons for imaging, providing much higher resolution than light microscopes.
Correct answer is: Electron microscope
Q.25 Which material is used in fiber optic cables to transmit data?
Copper
Plastic
Glass
Aluminium
Explanation - Fiber optic cables use thin strands of glass or plastic to transmit data as pulses of light with minimal loss.
Correct answer is: Glass