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A static UPS require 2 major components:
Rectifier which converts AC to DC.
Inverter which are used to charge battery from mains.

UPS or Uninterruptible Power Supply has short battery lifetime, enough to shut down the device it is connected to.

Each cell of a lead storage battery consists of alternate plates made of a lead alloy grid filled with sponge lead (cathode plates) or coated with lead dioxide (anode). Batteries are typically made of six galvanic cells in a series circuit. Each cell provides 12 volts at full charge.

Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies.
CDMA optimizes the use of available bandwidth as it transmits over the entire frequency range and does not limit the user’s frequency range. It is used as the access method in many mobile phone standards.
CDMA works within the frequency range of 850MHz and 1900 MHz.

SIM or Subscriber’s Identity Module is an Integrated Circuit (IC) that is used to authenticate and identify a subscriber. Without a SIM card, a GSM phone cannot tap a mobile network and without this, calls cannot be made.

BSS or Base Station Subsystem provides a path between a mobile station and a mobile switching centre (MSC). It enables number of users to access a network concurrently. Each channel can support up to 8 users.

NSS is essentially a data network with many entities that provide the main control and interface for the whole mobile network. It helps to manage switching functions.

Property by virtue of which material can absorb energy when deform elastically is called resilience
The property of material due to which it undergoes additional deformation with passage of time under sustainable loading is called creep.
Deterioration of material under repeated cycles of load resulting in progressive cracking ultimately leading to fracture is called fatigue

Hypoeutectoid steels on cooling during annealing process converts to perlite.
It has a coarse grain structure.
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian.

The two technologies, CDMA and GSM both handle data and calls in their own way. GSM operates in the form of a wedge spectrum, ie, the carrier will be divided into slots. Thus it can handle data and information at the same time.

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