which of the following devices holds multiple embedded systems in it

toaster
calculaor
smartphone
washing machine

All four devices - toaster, calculator, smartphone, and washing machine - can potentially hold multiple embedded systems within them.

The device that holds multiple embedded systems is a smartphone.

The device that holds multiple embedded systems among the given options is a smartphone.

To determine this, we need to understand what embedded systems are. Embedded systems are specialized computer systems designed to perform specific tasks within a larger system. These systems are typically integrated into everyday devices and are not intended for general-purpose computing. Common examples include the systems found in consumer electronics, appliances, automobiles, and industrial machinery.

Now, let's analyze the devices listed:
1. Toaster: A toaster typically has a simple embedded system that controls the toasting process, but it does not have multiple embedded systems.
2. Calculator: A calculator is a specialized device that performs mathematical calculations. While it does have an embedded system, it is usually a single system designed specifically for calculator functions.
3. Smartphones: Smartphones, on the other hand, are complex devices that incorporate multiple embedded systems. They contain several systems working together, such as the operating system, communication protocols, multimedia processing, sensors, and more. These systems enable various functionalities like making calls, browsing the internet, taking photos, playing games, and running various apps.
4. Washing Machine: While washing machines often have one or more embedded systems to control the different washing cycles, they typically do not have as many diverse systems as found in a smartphone.

Therefore, among the devices listed, the smartphone is the one that holds multiple embedded systems.