Explanation

Explanation

A resistor is a key component used in DC circuits to control the flow of current

While capacitors and inductors are also used in DC circuits,

Resistors are the most fundamental part of managing current.

Transformers, on the other hand, are typically used in AC circuits, not DC circuits.

Explanation

According to Coulomb’s Law, force is inversely proportional to the square of distance: F∝ 1/r².

So, if distance is doubled, force becomes 1/(2)² = 1/2.

Explanation

A diverging beam consists of rays spreading out from a point or axis.

It occurs when light passes through a concave lens or reflects from a convex mirror.

Explanation

When air heats up, it becomes lighter and rises, causing lower air pressure in that area.

Cooler air is denser and exerts more pressure, while rising warm air reduces surface pressure.

Explanation

In a dry cell, the electrolyte is a paste of ammonium chloride mixed with zinc chloride.

This paste allows the flow of electric current by enabling the movement of ions within the cell.

Explanation

Space garments are designed with thermal insulation to regulate astronauts' body temperature.

They can reduce body heat loss by 40% to 60%, preventing extreme temperature fluctuations in space.

Explanation

Autorefractor is used to measure refractive errors in the eye.

Ophthalmic Tomography (OCT) helps detect cornea and lens obstructions.

Explanation

Water has a unique property where its density is highest at around 4°C, making it denser than ice (which is solid water)

And the other options like benzene and chloroform at most temperatures. 

Ice is less dense than water: This is why ice floats on water. 

Density definition: Density refers to how much mass is packed into a given volume

Explanation