A poll of 2,000 mums and dads found 54 per cent are regularly flummoxed by the deep and meaningful or scientific questions put to them by their children.
In fact, the average mum and dad face eight questions a month from their offspring which they find difficult to respond to, either because they don’t know the answer or are too embarrassed.
And 53 per cent admit that the more scientific the question, the less likely they are to be able to answer it.
Other questions parents struggle to answer include ‘why do people die?’, ‘why is the sea salty?’ and ‘what is infinity?’
It also emerged the average parent will turn to Google six times a month to get the answer to a question their child has asked.
A spokesman for the company which commissioned the research said: “Children are known for always asking questions, but it can be difficult when they want to know things parents themselves don’t know the answer to.
“Sometimes mums and dads will stumble with their reply as it’s an awkward question or they know the answer is going to lead to more potentially embarrassing questions.
“But inquisitive children are also asking lots of questions about the planet, how things work and science which are leaving parents struggling to give them the right answer.
“It’s important to encourage your children’s thirst for learning new things and even if you have to Google the answer yourself, it can help them develop an interest in an important subject as they get older.”
But while 47 per cent of parents just respond with an honest ‘I don’t know’, 28 per cent admit to trying to cobble together an answer which sounds like it could be right while 35 per cent tell the youngster to Google it.
Twenty-three per cent Google it themselves and then pretend they knew the answer all along while others tell the child to ask their teacher (14%) or a sibling or other parent (11%).
Thirty-three per cent of parents even admitted to knowingly telling their children the wrong answer because they didn’t want to admit they didn’t know.
But 80 per cent of parents admit this has backfired when their children have then repeated the wrong answer to other people because they believed it to be right.
Top 30 impossible questions
1. What does God look like?
2. What came first, the chicken or the egg?
3. Where do you go when you die?
4. What are black holes?
5. Why is water wet?
6. Why do people die?
7. How did the world begin?
8. Where do babies come from?
9. Why is the sea salty?
10. Why is the moon sometimes out in the day?
11. How does the internet work?
12. Why is the sky blue?
13. Where does wind come from?
14. Why do we have a leap year?
15. What makes the Earth spin?
16. Why is blood red?
17. What is infinity?
18. How big is the world?
19. Why doesn’t the sky fall down?
20. Why does cutting onions make you cry?
21. How do planes fly?
22. How do telephones work?
23. How does TV work?
24. Why am I right/left handed?
25. What is electricity?
26. How do clouds float?
27. How does the car work?
28. How do the sun and moon stay in the sky?
29. Why are people’s eyes different colours?
30. How does lightning strike?