From Vitamins to NASA The Hindu Science Quiz
Artist's conception of NASA's Osiris-Rex spacecraft collecting a sample from the asteroid Bennu.
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What is the vitamin – calciferol – which helps prevent rickets in children and in general promotes calcium absorption in the gut of people, commonly known as?
Vitamin D is found in Fatty fish such as salmon Mackerel and Tuna, cheese, egg yolk and sunlight.
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Which are the pairs of elements whose radioactivity allows them to be commonly used to determine the age of rocks and fossils?
- Zinc and Carbon
- Potassium and Carbon
- Lead and Calcium
- Copper and Carbon
Potassium and Carbon – The ratio of radioactive argon to radioactive potassium is used to estimate age of rocks. Radioactive carbon is used to date fossils younger than 75,000 years.
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Recent discovery showed that though this celestial body does not possess a global magnetism, it has patchy remnants that can be felt today. Which one is it among the following?
The Moon had a core magnetic field comparable with that of the Earth before approximately 3.4 billion years ago. At present it only has a few remnant patches here and there.
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Symbiosis in animals is a form of mutualism where different species are seen to help each other. Among these, when one organism benefits greatly and the other is not significantly helped or harmed, what do you call the relationship?
- Commensalism
- Mutualism
- Parasitism
- Endophytism
An example of commensalism is of birds living in the hollows of trees. While the bird benefits, no great harm falls of the tree. Another such example is of some species of barnacles that grow with specific sea turtles.
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There was a space mission by NASA launched in 2016 by name OSIRIS-REx which performed a delicate landing recently. What was its destination?
- Mars
- The International Space Station
- Asteroid Bennu
- Comet 67P – Churyumov-Gerasimenko
Scientists have calculated that asteroid Bennu formed some 4.5 billion years ago. There is a small chance that it may impact the earth by the end of next century.
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