Explanation

Diabetes mellitus is a metabolic disorder where the body cannot properly regulate blood glucose.

It occurs due to insufficient insulin production or poor insulin response.

High blood sugar over time can damage organs like the heart, kidneys, and eyes.

Symptoms include frequent urination, excessive thirst, and unexplained weight loss.

Explanation

Noble gas atoms generally do not form bonds under normal conditions

Due to their full valence electron shells, making them highly stable and inert.

However, under extreme pressure, low temperatures, or with highly reactive elements like fluorine and oxygen,

They can form compound bonds, primarily involving heavier gases like xenon. 

Explanation

Beta decay emits high-energy, high-speed particles,

Specifically, an electron  along with an antineutrino, or a positron along with a neutrino

These particles are emitted from the atomic nucleus to achieve a more stable neutron-to-proton ratio. 

Explanation

Fossil fuels like coal, oil, and natural gas are primarily composed of carbon and hydrogen.

These elements are stored energy from ancient plants and organisms.

When burned, they release energy along with carbon dioxide and water.

The high carbon and hydrogen content makes them excellent sources of fuel.

Oxygen and nitrogen are present in very small amounts compared to carbon and hydrogen.

Explanation

LPG (Liquefied Petroleum Gas)

Mainly consists of hydrocarbons like propane and butane.

These are gases composed of hydrogen and carbon atoms.

It is used as fuel for cooking and heating.

Explanation

Air always moves from regions of high pressure to low pressure.

This movement creates wind and drives weather patterns.

The greater the pressure difference, the stronger the wind.

High-pressure areas are usually associated with clear skies.

Low-pressure areas often bring clouds and precipitation.

Explanation

A comet moves fastest when it is closest to the Sun, called perihelion.

The Sun’s gravity pulls the comet strongly, increasing its speed.

At aphelion (farthest point from the Sun), its speed is much slower.

This follows Kepler’s laws of planetary motion.

The increase in speed also causes the comet’s tail to become more visible.

Explanation

The Sun produces energy through nuclear fusion in its core.

In fusion, hydrogen nuclei combine to form helium, releasing huge energy.

This energy radiates as sunlight, heat, and solar radiation.

Fusion is different from fission, which splits heavy nuclei.

Solar energy powers life on Earth and can be harnessed for electricity.

Explanation

Submandible refers to the area under the lower jaw (mandible).

It is close to the ear region.

It contains submandibular glands, which are salivary glands.

Explanation

• Nitrobacter bacteria convert nitrite (NO₂⁻) into nitrate (NO₃⁻) in the soil.
• This is the second step of the nitrification process, which is important for plant nutrition.
• Nitrite is toxic to plants, but nitrate is easily absorbed as a nutrient.

Last verified on 22-01-2026