Yes sure. It is valid. It will shows the how fast you are thinking.
No
A valid test is not always a reliable test. Validity refers to whether a test measures what it claims to measure, while reliability refers to the consistency of test results over time. For example, a test designed to measure mathematical ability may be valid if it accurately assesses math skills, but if the test yields vastly different scores when taken multiple times by the same individual, it lacks reliability. Thus, a test can be valid in content but still unreliable in execution.
In my view reliable test is always valid.
There is no such valid test, so I would definitely question it.
No
Validity of a test refers to the ability of test to test what it is supposed to test
A test may be reliable but not valid. A test may not be valid but not reliable. For example, if I use a yard stick that is mislabeled to measure the distance from tee to hole in golf on different length holes, the results will be neither reliable nor valid. If you use the same stick to measure football fields that are the same length the result will reliable (repeatable, consistent) but not valid (wrong numbers of yards). There is no test that is unreliable (repeatable, consistent) and valid (measures what we are looking for).
Normally online tests are accurate, but in order to test your psychic ability you should look elsewhere. Online psychic tests aren't going to have the accuracy you need and you should go see a professional to test your abilities.
Yes, it would be a valid test.
Aston Index is an ability test.
Reliable indicates that each time the experiment is conducted, the same results are obtained (accuracy). Valid indicates the experiment (or test) has controlled variables and used an appropriate method/model.
You can find a free working memory test online on websites like Cambridge Brain Sciences or CogniFit. These tests can help assess your ability to hold and manipulate information in your mind.