which of the following are powers that are exercised by both the national government state government at the same time

Some of the powers that are exercised by both the national government and state government at the same time include:

1. Taxation: Both levels of government have the authority to levy and collect taxes from individuals and businesses within their jurisdiction.

2. Public Safety: Both the national and state governments are responsible for ensuring the well-being and security of their citizens. This includes maintaining law and order, providing law enforcement services, and managing emergency response systems.

3. Criminal Justice System: The national government and state governments have their respective criminal justice systems. While the federal government focuses on crimes that violate federal law (e.g., drug trafficking, terrorism), state governments handle crimes that violate state laws (e.g., murder, theft).

4. Infrastructure Development: Both levels of government are involved in the development and maintenance of infrastructure such as roads, bridges, water systems, and public transportation.

5. Education: While education primarily falls under the jurisdiction of state governments, there is also a federal role in education policy and funding. The federal government provides financial support and sets certain regulations for education, while states have the authority to establish their own education systems.

6. Environmental Protection: Both the national and state governments have the power to regulate and protect the environment. While federal agencies like the Environmental Protection Agency (EPA) set national standards, state governments can enact additional regulations to address specific environmental issues within their states.

It is important to note that the respective powers of the national and state governments can vary depending on the country and its constitutional structure. This answer is based on the assumption that you are referring to the United States.