answer with explanation

Part 1. Tests (single choice) 1. If the elements are arranged in parallel connection which law for calculating the system reliability should be applied? (2 points) a) Product law of unreliability. b) Product law of reliability. c) Exponential law of reliability. d) Product law of probability. 2. What is abrupt fault? (2 points) a) drift-like fault; b) intermittent fault; c) stepwise like fault; d) additive fault. 3. How can be called one random function? (2 points) a) integral function; b) differential function; c) time function; d) sample function 4. What are the most commonly used test quantities for statistical hypothesis testing? (2 points) a) mean and standard deviation; b) autocorrelation and autoregression; c) speed and acceleration; d) probability density