Explanation

Optical fibers transmit data as light signals.

The signal is confined within the fiber due to the phenomenon where light hits a medium boundary.

It is completely reflected back.

Explanation

The formula to convert temperature from Celsius to Fahrenheit: T(°F) = 1.8T(°C) + 32

The formula to temperature convert Fahrenheit to Celsius: T(°C) = T(°F) - 32/1.8

Explanation

Inertia is the property of an object to resist any change in its state of rest or uniform motion.

It is described in Newton’s First Law of Motion, also called the Law of Inertia.

Explanation

The Pacific Ocean is the largest ocean.

It covering about one-third (1/3) of the Earth's surface.

It spans over 63 million square miles, more area than all landmasses combined.

Explanation

Telstar was the first TV relay satellite launched into space by the United States on July 10, 1962.

It enabled the first transatlantic television transmission, revolutionizing global communication.

Explanation

In electric meters, current flowing through coils generates a magnetic field.

This magnetic field causes the aluminum disc inside the meter to rotate, measuring energy usage.

Explanation

Telstar, launched in 1962 by the US, was the first active communications satellite.

It successfully relayed television, telephone, and data signals across the Atlantic.

Explanation

Fixing is the process in photography that removes residual silver halide from the image.

Without fixing, silver halide remains light-sensitive and can darken the image upon further exposure.

Explanation

Back e.m.f (electromotive force) is the voltage opposing the applied voltage, commonly seen in motors and inductive circuits.

When back e.m.f = 0, there is no opposing voltage, so the entire applied voltage appears across the circuit's resistance.

From Ohm's Law:

I=V−back e.m.f​/R

If back e.m.f = 0, then

I=V/R​(maximum possible current)

Explanation

SQUID stands for Superconducting Quantum Interference Device.

It is an extremely sensitive magnetometer used to detect very weak magnetic fields, such as those produced by brain activity (in magnetoencephalography, or MEG).

It can detect magnetic fields as small as 10⁻¹⁴ tesla, making it ideal for brain studies.