Explanation

• Pressure is a fundamental physical quantity that is defined as the force exerted per unit area.
• It is a measure of the strength of a force acting on a surface.
• It is typically measured in units such as Pascals (Pa) or pounds per square inch (PSI).

Explanation

1 kilowatt hour (kWh) = 3.6 million joules (3.6 × 10⁶ J)

1 joule = 10⁷ ergs, so both joule and erg are much smaller than kilowatt hour.

Hence, Kilowatt hour is the biggest unit.

Explanation

Biotic Components:

Living organisms (e.g., plants, animals, microbes).

Abiotic Components:

Non-living factors (e.g., sunlight, water, soil, temperature).

Explanation

Industrial waste includes harmful chemicals and toxins dumped into rivers and lakes.

It is a major source of water pollution, harming aquatic life and contaminating drinking water.

Explanation

Xerophytes are plants adapted to dry environments with low water availability.

Examples include cactus and succulents, which have features to store or conserve water.

Explanation

Geophysics is the science that studies the internal structure and physical properties of the Earth.

It includes the study of earthquakes, magnetic and gravitational fields, and Earth's interior layers.

Explanation

Deforestation reduces the number of trees that absorb CO₂ and release oxygen.

This leads to higher CO₂ levels, contributing to pollution and climate change.

Explanation

The greenhouse effect occurs when gases like CO₂ and methane trap heat from the sun in the Earth’s atmosphere.

This trapped heat causes a rise in global temperatures, contributing to climate change.

Explanation

The resistance of a wire is directly proportional to its length (R ∝ L).

If the length is doubled and the area remains the same, the resistance will also double.

Explanation

Arteries are blood vessels that carry oxygen-rich blood away from the heart to the body.

They have thick, muscular walls to handle the high pressure of blood pumped by the heart.