Coin Roll Hunting Trivia Game.

What years did the U.S. have a silver nickel?

42, 43, 44,45 There are 11 coins all together, the 42d wasn't silver.

Careful here. You could argue that other P coins were made without mintmarks. How about "What three years were JFKs made without mint marks regardless of the mint of origin?"

1. What is the oldest half dollar date that could fit in a roll?
A. 1836.
2. If a dateless Indian Head five cent piece (nickel) has a raised exergue on the reverse, what year is it from?
A. 1913.
3. In what year did the San Francisco mint begin minting silver proofs?
A. 1992.
4. What percentage is a modern five cent piece (nickel) is actually nickel?
A. 25%.
5. What is the only half dollar date with a mintage over 300 million?
A. 1971-D.
6. Why are half dollars dated 2002-present difficult to find in rolls?
A. They are not released into circulation.
7. What Kennedy half dollar dates (regardless of mintmark) were not released into circulation?
A. 1970, 1987, 2002-present.
8. What was the first year that cents of the current diameter were struck for circulation?
A. 1857.
9. The Roosevelt dime has been issued since what year?
A. 1946.
10. What is the oldest current coin design?
A. The obverse of the Lincoln Cent, from 1909.
11. Small-size dollars have been issued since what year?
A. 1979.
12. What is the composition of a five cent piece (nickel) issued in 1943?
A. 0.56 Cu, 0.35 Ag, 0.09 Mn.
13. Since 1836, in what years have the weight of the circulating half dollar changed?
A. 1853, 1873, 1965, 1971.
14. How many grams does an 1873-1964 dime weigh?
A. 2.5.
15. What is the oldest five cent piece (nickel) date that could be found in a roll?
A. 1866.

These are the first ones that came to mind, but I can provide lots more if you like.
This sounds like an interesting project. Good luck!