1: Any one is correct because any of them don't match the others (they are all different)
2: Any one can be made to work into the pattern.
3: Any can be argued correct. For example, copper is the best conductor of the group so if you define a threshold of conductivity so only copper is above it, then it is the "odd metal out".
4: Any one could be considered correct. It was not stated it was a fair single deck of cards being used. It is also an incorrect use of the word missing. The card is there, just face down.
This is not a legit IQ test. This tests certain knowledge of certain subjects and of course someone could guess 1 or more answers correct. It seems whoever made this "IQ test" should have their own IQ evaluated because these are all ill formed (highly flawed) questions.
I checked out the rest of the "IQ" test and it is not good. For example, look at this question they ask:
London and Manchester are 200 miles apart.
Jack travels from London to Manchester at an average speed of 70mph.
Robert travels in the opposite direction, from Manchester to London, at an average speed of 30mph.
Knowing that they leave at the same time, in how much time will their paths cross each other?
This question cannot be answered accurately for several reasons:
1) only average speed is stated so we don't know when they will cross paths. It would depend on traffic patterns and many other factors such as if they drive slower or faster than average and when.
2) What does that mean paths cross? Who said they are taking similar routes?
3) 200 miles apart driving distance or direct line distance? They did not specify.
4) If their paths are parallel but just opposite direction (let's assume best case 1 straight 200 mile road), then they will never "cross" strictly speaking. They may pass each other on the same road but that is not how the question is worded.