Q: How many different types of stresses are there? Choices: - five - seven - three - four A:
four

Q: Positive charges move in the direction of the electric field and the same direction as what current? Choices: - alternating current - direct current - relativity current - conventional current A:
conventional current

Q: What is the term for a process that changes some chemical substances into others? Choices: - acid reaction - toxic reaction - chain reaction - chemical reaction A:
chemical reaction