Explanation

A pinhole camera works without lenses.

It uses a small aperture (pinhole) to project an inverted image of the scene onto the opposite surface.

Explanation

The lungs are located on either side of the breastbone in the chest cavity 

Explanation

Conical and cylindrical projections are types of map projections that use light from a source point.

In conical projections, the light source is at the center of the sphere, projecting onto a cone,

While cylindrical projections wrap the light around a cylinder.

Explanation

Explanation

The separation of visible light into its different colours is known as dispersion.

When white light passes through a prism, it splits into 7 colors, forming a spectrum known as a rainbow:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

Explanation

Hydrogen has an atomic weight of 1.00794u and accounts for 75% of the universe,

Thus making it the lightest and most abundant element in the universe.

Explanation

It's measured by Young's modulus (modulus of elasticity) — the higher the Young's modulus, the stiffer and more elastic (in the sense of resisting deformation) the material.

• Copper: ~110–130 GPa
• Silver: ~80–83 GPa
• Iron: ~190–210 GPa
• Quartz (fused silica): ~70–75 GPa

Last updated 24-07-2026 by NA

Explanation

The demographic transition model was initially proposed in 1929 by demographer Warren Thompson.

Explanation

Algae, especially phytoplankton in oceans, are responsible for producing the largest amount of oxygen on Earth.

It contributing to over 50% of the planet's oxygen supply.

Explanation

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power.

Transistors are one of the basic building blocks of modern electronics.