Tag: science & technology

Meconium is the first stool passed by a newborn, typically within the first 24-48 hours after birth. It is a thick, dark, sticky substance composed of materials ingested during fetal development like amniotic fluid, mucus, bile, and epithelial cells. Ammonia, urea, and nitrogen are waste products excreted in urine, not solid waste.

The medulla oblongata is located at the base of the brainstem and connects the brain to the spinal cord. It contains vital centers for controlling involuntary functions like breathing, heart rate, and blood pressure. The cerebrum and cerebellum are above it in the brain, while diencephalon includes thalamus and hypothalamus above the brainstem.

The cochlea is the spiral-shaped bone in the inner ear that converts sound vibrations into nerve signals. The semicircular canals are fluid-filled tubes that help with balance, not the main circular structure of the ear.

The adrenal glands sit atop each kidney like a cap. They produce hormones like cortisol and adrenaline. The name literally means 'near the kidney'. Other options are endocrine glands but not positioned above kidneys.

Total Internal Reflection occurs when light travels from a denser medium to a rarer medium at an angle exceeding the critical angle. The statement reverses this condition, making it false.

In the visible spectrum, wavelength increases from violet (~400nm) to red (~700nm). Violet has the shortest wavelength and highest frequency, while red has the longest wavelength and lowest frequency.

Mirages occur due to total internal reflection when light passes through air layers of different temperatures. Hot ground creates a rarer (less dense) air layer near the surface, causing TIR and creating the illusion of water.

The refractive index of vacuum is defined as exactly 1, serving as the reference medium for all other refractive indices. Air has n≈1.0003, often approximated as 1.

The fluid inside the inner ear, called endolymph and perilymph, plays a crucial role in maintaining balance and equilibrium. The vestibular system within the ear contains sensors that detect head position and movement relative to gravity. This fluid helps transmit signals to the brain about body orientation, enabling coordination and stability.