Explanation

• Sound waves first enter the ear through the Ear Canal.
• It is also known as the external auditory meatus.
• From there, they travel to the eardrum, then to the cochlea, and finally to the auditory nerve.

Last verified on 15-03-2026

Explanation

• Transmission is the process where light passes through a material without being absorbed or reflected.
• The light may pass completely unchanged if the material is transparent.

Additional information:

• Reflection – Light bounces back from a surface
• Absorption – Light is taken in by a material and converted to heat
• Refraction – Light bends while passing from one medium to another (like air to water)

Last verified on 15-03-2026

Explanation

Gears can:

• Change speed: Gears can increase or decrease
• Change direction: Gears can change the direction of rotation
• Change force: Gears can increase or decrease the force

However, gears cannot change the fulcrum, which is the pivot point or axis of rotation.

Last verified on 15-03-2026

Explanation

• Fuel stores energy in the form of chemical bonds.
• When fuel burns in the engine, this chemical energy is converted into mechanical energy to move the car.
• Gasoline, diesel, and natural gas are common fuels storing chemical energy.
• The process of burning fuel to release energy is called combustion.

Last verified on 15-03-2026

Explanation

• Weight is the force exerted on an object due to gravity.
• It depends on both the mass of the object and the acceleration due to gravity (g ≈ 9.8 m/s²).
• Weight (W) = Mass (m) × g

Last verified on 15-03-2026

Explanation

• According to Albert Einstein, light travels in the form of photons, which are tiny packets (quanta) of energy.
• This concept was proposed in 1905 while explaining the photoelectric effect.
• Photons behave like particles but also show wave properties.

Last verified on 15-03-2026

Explanation

• All plants move Anticlockwise around Sun.
• All plants move anticlockwise around their axis.
• Earth rotates its axis from West to East.

Last verified on 15-03-2026

Explanation

Work done (W) by a force is calculated as:

W = F × d × cosθ.

• F = force applied
• d = displacement of the body
• θ = angle between force and displacement

When θ = 0° (force parallel to motion), cos 0° = 1, so work done is maximum.

Last verified on 14-03-2026

Explanation

• Law of Inertia = Newton’s First Law of Motion.
• States: “An object at rest stays at rest, and an object in motion continues in the same direction and speed unless acted upon by an unbalanced force.”
• Explains why seat belts are important in cars.
• Applies to all objects on Earth and in space.

Last verified on 13-03-2026

Explanation

• The Sun is a star.
• There are lots of stars, but the Sun is the closest one to Earth.
• It is the center of our solar system.
• The Sun is a hot ball of glowing gases.
• The sun is composed of layers made up almost entirely of hydrogen and helium.

Last verified on 13-03-2026