Question

The device in which the nuclear fission and release of energy is controlled is known as
A. Thermopile
B. Thermostat
C. Nuclear reactors
D. Cloud chamber

Answer 1

Hint: The names of the devices in the options are a good indication of what they are. For example thermos in thermopiles and thermostats indicates that they are related to temperature.

Complete step by step answer:
To solve we need to identify each of the options and what they are used for.
Option A, thermopile – a thermopile is basically an electronic device that converts thermal energy into electrical energy. It is usually composed of thermocouples to do this.
Option B, thermostat – a thermostat is a device that is used to sense the temperature of a body and then perform an action based on the temperature input. Thermostats are a very common device in automation and the internet of things.
Option C, nuclear reactor – a nuclear reactor is a device that is used to start and control a nuclear reaction which will be self-sustaining, for a consequent release of energy. Generally, nuclear reactors are used to generate electricity. To do this, they are placed in a facility known as nuclear power plants. Nuclear power plants house nuclear reactors and personnel who build, maintain, and clean (and others) nuclear reactors.
Hence, the correct option is C.

Note: The nuclear reactor generates an enormous amount of energy which can be used to generate electricity. However, this same enormous energy makes the nuclear reactors dangerous as they can go out of maintainable range. In addition, the wastes of nuclear reactions are dangerous to life and hence need to be disposed of properly. These limitations are why nuclear reactions are not the major source of generating electricity in the world today.