Explanation

All the listed fields (gravitational, electric, and magnetic) are conservative fields.

In conservative fields, the work done moving a particle between two points is independent of the path taken.

Explanation

Herbert Spencer (1820–1903) was an English philosopher who initiated a philosophy called 'Social Darwinism'.

He coined the term 'survival of the fittest' seven years before Darwin's publication of his theory of natural history.

The Origin of the Species in 1859.

Explanation

A phrase is a group of words that does not give a complete sense and lacks a verb.

It is a unit of language that functions as a single unit, but does not express a complete thought.

Explanation

Acrocentric chromosomes are chromosomes with one arm (p arm) that is significantly shorter than the other arm (q arm).

The p arm is often very small, and may be barely visible, while the q arm is much longer.

Examples of acrocentric chromosomes include chromosomes 13, 14, 15, 21, and 22 in humans.

Explanation

A step-up transformer increases the voltage of the input signal, resulting in a higher voltage output.

This is achieved by having more turns in the secondary coil than in the primary coil.

Explanation

DNA (Deoxyribonucleic acid) is the primary molecule that encodes genetic information in cells.

It is a long, double-stranded helix made up of nucleotides, which are the building blocks of genetic information.

Explanation

A respiratory surface, such as the alveoli in lungs or the surface of gills, possesses the following properties:

• Thin: allows for efficient gas exchange
• Wet: facilitates the exchange of gases between the surface and the surrounding environment
• Permeable: allows gases to pass through the surface
• Very large: provides a large surface area for gas exchange to occur

Explanation

Bromine (Br2) is the only halogen that exists in a liquid state at room temperature.

It is a reddish-brown liquid with a melting point of -7.2°C or 19°F.

Explanation

Hydroiodic acid (HI) is the strongest acid.

The acidity of hydrohalic acids increases down the group in the periodic table.

Due to the decreasing bond strength and increasing bond length.

Explanation

• Communication satellites are used for telecommunication.
• Including telephone communication, internet connectivity, and television broadcasting, enabling global communication networks.