(Question)
Q: What device is used to stop a current in a circuit? Choices: - a signal - a valve - a mirror - a switch A:
(Answer)
a switch

(Question)
Q: Atoms of different elements can combine in simple whole number ratios to form what? Choices: - mixtures - carbon compounds - combinations - chemical compounds A:
(Answer)
chemical compounds

(Question)
Q: What term given to animals like reptiles is a synonym for ectothermic, which means that their heat comes from their environment? Choices: - warm-blooded - hot-blooded - thermal regulating - cold-blooded A:
(Answer)
cold-blooded