Explanation

Composition of Air:

• Nitrogen → 78%
• Oxygen → 20.95%
• Argon → 0.93%
• Carbon dioxide → 0.04%
• Other gases → very small traces

Last verified on 30-04-2026

Explanation

• Noise intensity is measured in decibels (dB).
• It indicates the loudness of sound.
• It helps assess noise pollution in cities, industries, and traffic areas.
• Noise pollution affects hearing, stress levels, and sleep.
• Reducing exposure above 85 dB is important for health protection.

Last verified on 19-03-2026

Explanation

• The flash of light from lightning is a form of electromagnetic radiation, and as such, it travels at the speed of light.
• It is denoted by the letter c.

It is equal to:

• 3 x 10^8 meters per second (m/s) in scientific notation.
• 300,000 kilometers per second (km/s) in metric units.
• 186,282 miles per second (mi/s) in imperial units

Last verified on 19-03-2026

Explanation

• Cat and Dog is/are a secondary consumer.
• Because they eats primary consumers (herbivores).
• Like mice, birds, and rabbits.

Last verified on 19-03-2026

Explanation

• The olfactory bulb is a structure in the brain responsible for processing smells detected by the nose.
• It receives signals from olfactory receptor neurons and sends them to other brain regions for interpretation.
• Location: underside of the frontal lobe of the brain

Last verified on 19-03-2026

Explanation

• The ear canal (external auditory canal) transmits sound waves from the outer ear to the eardrum in the middle ear.
• It acts as a conduit, amplifying sound slightly and protecting the inner structures.
• Ear Canal length: ~2.5 cm in adults

Last verified on 19-03-2026

Explanation

• The iris is the colored part of the eye (blue, brown, green, etc.).
• It controls the size of the pupil, regulating how much light enters the eye.

Additional information:

• Pupil – black opening for light
• Cornea – transparent front layer
• Lens – focuses light
• Retina – receives image

Last verified on 19-03-2026

Explanation

• Comets: huge masses of snow and rocks that revolve around the Sun in orbits.
• Comets: have huge glowing tails.
• Halley's Comet was last seen in: 1986
• Halley's Comet will be next seen in: 2062

Last verified on 18-03-2026

Explanation

• Apollo 11 was the mission that successfully landed astronauts.
• Neil Armstrong and Buzz Aldrin on the moon on July 20, 1969.

Last verified on 15-03-2026

Explanation

• Security mirrors are typically convex mirrors.

The examples of concave mirrors:

• Cosmetic mirrors (makeup mirrors)
• Dentist mirrors
• Car headlight mirrors

Last verified on 18-03-2026