Explanation

The human hearing range is typically from 20 Hz to 20,000 Hz.

Sounds below 20 Hz are called infrasound.

Sounds above 20,000 Hz are called ultrasound, both of which are inaudible to humans.

Since 22,000 Hz is above 20,000 Hz, it is an inaudible sound.

Explanation

Ohm’s Law states that V = IR, where voltage (V) is directly proportional to current (I) and resistance (R).

It is the fundamental principle describing the relationship between voltage, current, and resistance in electrical circuits.

Explanation

Explanation

Nitrogen (N₂) makes up 78% of Earth's atmosphere and is not a pollutant.

NO₂ and SO₂ are major air pollutants from vehicles and industries.

Explanation

To convert Celsius to Kelvin: K = °C + 273.15

So, 37 + 273.15 ≈ 310 K

Explanation

In a straight forward roll, the hands push against the ground to initiate and guide the roll.

This helps shift the body weight forward and maintain balance during the movement.

Explanation

Cornea is the transparent, dome-shaped front part of the eye.

It allows light to enter and helps focus it onto the retina.

Explanation

Lost organ refers to a characteristic that is acquired due to injury or environmental factors.

It is not passed down to offspring, making it non-heritable.

Traits like eye color, height, and detached ear lobes are genetically inherited.

Explanation

Polio primarily affects the nervous system and can cause muscle weakness or paralysis.

It often targets children and may lead to permanent disability.

Explanation

DRABC stands for Danger, Response, Airway, Breathing, Circulation — essential for checking vital signs in emergencies.

RICES stands for Rest, Ice, Compression, Elevation, Support — used mainly for soft tissue injuries like sprains.