General Science & Technology Quiz

The liver produces bile, which helps digest fats in the small intestine by emulsifying them. Bile is stored in the gallbladder and released when needed. Option A is incorrect because the liver does not primarily create hormones, and option B is incorrect because insulin is produced by the pancreas.

The normal resting heart rate for adults is typically 60-100 beats per minute, with 72 bpm being a commonly cited average. This can vary based on age, fitness level, and health status. The statement is factually correct as a general reference point.

Tuberculosis (TB) primarily affects the lungs, leading to a persistent cough, chest pain, and coughing up blood. Systemic symptoms include fever, night sweats, and weight loss. Sneezing and cold are typical of viral upper respiratory infections.

The brain tissue itself lacks nociceptors (pain receptors). While the meninges and blood vessels surrounding the brain can feel pain (causing headaches), the brain parenchyma cannot feel pain during surgery or stimulation.

The human brain actually consumes about 20 watts of power, not 300-400 watts. The brain uses about 20% of the body's total energy despite being only 2% of body weight, but this amounts to roughly 20 watts, not hundreds of watts. The claim in the question is greatly exaggerated.

Research suggests that humans have approximately 60,000-70,000 thoughts per day, making option B the closest estimate. This varies by individual and depends on what constitutes a 'thought'. Option A is too high, and option C is too low.

Laughing involves multiple brain regions including emotional processing areas and motor control centers, requiring coordination of approximately 15-17 facial muscles. Option C correctly identifies 5 brain regions and 17 muscles as the closest approximation among the choices.

The blood vessels in the brain, including capillaries, arteries, and veins, if stretched out end-to-end, would span approximately 100,000 miles. This extensive network ensures oxygen and nutrients reach all parts of the brain. Option A is the correct order of magnitude.

One nanometer equals 10^-9 meters, or one billionth of a meter. This is a standard metric prefix conversion where 'nano' means 10^-9. This makes option C correct.

Mica transfers heat efficiently from the heating element while blocking electric current. This dual property makes it ideal for isolating the heating component electrically while conducting thermal energy to the surface.

Rainbow formation requires three optical processes: refraction when sunlight enters the water droplet, internal reflection off the droplet's back surface, and refraction again when exiting. Dispersion during refraction separates white light into colors.

Planets do not generate their own light - they shine only by reflecting sunlight. Unlike stars (luminous bodies that produce energy through fusion), planets are non-luminous celestial bodies orbiting stars.

A solar eclipse occurs when the Moon passes directly between the Sun and Earth, blocking sunlight from reaching Earth's surface. This alignment creates the Moon's shadow on our planet.

Isotopes are atoms of the same element with identical atomic numbers (same protons) but different mass numbers (different neutrons). This variation in neutrons changes atomic mass while preserving chemical identity.

C.V. Raman received the Nobel Prize in Physics in 1930 for discovering the Raman effect - the inelastic scattering of photons by molecules. This phenomenon (Raman scattering) became a fundamental tool in molecular spectroscopy.

The Mach number represents the ratio of an object's speed to the speed of sound in the surrounding medium. It is primarily used to characterize aircraft velocities, classifying flight regimes from subsonic (M<1) to supersonic (M>1).

The ozone layer in the stratosphere contains high concentrations of ozone (O3) molecules that absorb harmful UV-B and UV-C radiation from the sun, protecting life on Earth. The infrared, greenhouse, and ultraviolet layers are not actual atmospheric layers.