Reviewer - Recent questions and answers in Science

Answered: Why is the sky blue according to basic science?

Tue, 25 Nov 2025 12:42:45 +0000

For science exams, remember this simple line: “Blue light scatters the most because it has a shorter wavelength.” This is the core reason behind the blue sky. Rayleigh scattering also helps explain why distant mountains look bluish and why astronauts see a black sky in space. Since space lacks atmosphere, no scattering occurs, so the sky looks completely dark.

Answered: How do vaccines work inside the human immune system?

Tue, 25 Nov 2025 12:12:30 +0000

Modern vaccines also use technologies like mRNA, which teach cells to produce harmless proteins that trigger the immune response. This method is safe and effective. For GK exams, remember: vaccines reduce disease, prevent outbreaks, and build herd immunity. They are considered one of the greatest public health achievements in science.

Answered: What causes earthquakes according to science?

Tue, 25 Nov 2025 11:27:20 +0000

The point beneath the Earth’s surface where the energy is released is called the focus, and the point directly above it on the surface is called the epicenter. Earthquakes can also be caused by volcanic activity, mining, and large reservoirs, but tectonic movements are the most common cause. For competitive exams, remember: Plate movement = stress = sudden release = earthquake.

Answered: What is photosynthesis in plants?

Tue, 25 Nov 2025 09:57:30 +0000

Photosynthesis can be summarised with the simple equation: Carbon dioxide + Water + Sunlight → Glucose + Oxygen. Plants store glucose for energy and growth. This process helps maintain the balance of oxygen and carbon dioxide in the atmosphere. Without photosynthesis, life on Earth would not be possible.

Answered: What is the speed of light and why is it important in physics?

Tue, 25 Nov 2025 09:27:20 +0000

The speed of light is important because it represents the maximum speed at which information or matter can travel. It also helps scientists measure distances in space using “light-years,” which represent how far light travels in one year. For Science GK, remember: speed of light = 3 lakh km/s, symbol = c, importance = universal constant in physics.