Explanation

Iron is the metal with the highest percentage in stainless steel

Iron (Fe):

The foundational element, providing the main structure, usually 60-75%.

Chromium (Cr):

Essential for rust resistance, forming a protective passive layer, typically 10.5% to 30%.

Nickel (Ni):

Added to enhance ductility, strength, and corrosion resistance, especially in austenitic grades (like 304 stainless steel, which has 8% nickel).

Carbon (C):

A small amount (under 1.2%) is present, influencing hardness and other properties. 

Explanation

The Equator is an imaginary line that divides the Earth into the Northern and Southern Hemispheres.

It lies equidistant from the North and South Poles.

Explanation

Accretion is the process where a black hole pulls in surrounding gas, dust, and matter due to its strong gravitational pull.

This material forms an accretion disk around the black hole before being absorbed.

Explanation

Nitrous oxide is commonly called laughing gas.

It is used to induce anesthesia during surgeries.

It helps patients remain unconscious or pain-free during medical procedures.

Explanation

• The Pakistan Space and Upper Atmosphere Research Commission (SUPARCO) was established in 1961.
• It was originally formed as a Committee in 1961 and gained Commission status in 1981.
• The SUPARCO is Pakistan's national space agency and is responsible for the development of space technology and its peaceful applications in the country.
• It is headquartered in Islamabad and has technical facilities in Karachi, Lahore, Multan, Quetta, Peshawar and Gilgit.

Explanation

Abrasion occurs when wind carries sand and dust, wearing down rock surfaces.

It is a common feature in desert and arid regions shaped by air action.

Explanation

Solar photovoltaic (PV) panels directly convert sunlight into electricity without turbines.

Other sources like hydropower, wind, and thermal rely on turbines to generate electricity.

Explanation

A velometer measures the velocity of airflow in ducts or open spaces.

Commonly used in HVAC systems and meteorological studies.

Explanation

Antoine Henri Becquerel was an engineer, physicist, Nobel laureate,

First person to discover evidence of radioactivity.

 He belonged to France.

Explanation

Mass of an object does not change regardless of its location, including in space.

Weight, however, depends on gravity and can change in space.