Answer to Question 1
Answer: Systematic risk is risk that cannot be diversified away, is measured with beta, and is the risk that impacts all stocks in an economy. On the other hand, unsystematic or diversifiable risk CAN be diversified away. This is risk that is unique to the asset and can be eliminated when combined in a portfolio of risky assets. As for our statement, we CANNOT totally eliminate uncertainty of returns just by increasing the number of risky assets that make up the portfolio: although we can eliminate unnecessary or unsystematic risk, we cannot eliminate systematic risk through diversification. Therefore, we cannot realize a risk-free investment with greater than risk-free returns.
Answer to Question 2
Answer: TRUE