From Asimov to anaerobes The Hindu Science Quiz
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The following are the four major emissions that cause the greenhouse effect. Which of the following gases is the leader?
- Carbon dioxide
- Methane
- Nitrous oxide
- Fluorinated gases
Fossil fuel use is the primary source of carbon dioxide, followed by activities like deforestation, clearing of land for agriculture etc.
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Most living beings require oxygen to breathe and grow. Organisms that do not require oxygen are called anaerobes. Which of the following statements about anaerobes is wrong?
- Clostridium is an anaerobe
- Obligate anaerobes are not destroyed by exposure to normal air
- Anaerobic bacteria were first observed by Antonie van Leeuwenhoek
- Over 99% of bacteria in the gut are anaerobic
Obligate anaerobes are in fact killed by exposure to oxygen of the concentrations present in air.
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What is the percentage of carbon dioxide in the air, approximately?
- 40%
- 4%
- 0.4%
- 0.04%
The percentage of carbon dioxide in air is only 0.04% . The bulk of it is nitrogen (78.084%), Oxygen (20.946%) and Argon (0.934%). The rest are trace gases.
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Aditya-L1 will be India’s space mission to study the Sun and is to be launched next year. What does ‘L1’ indicate?
- Longitude -1
- Lattitude -1
- Lagrange point-1
- Liouville point -1
Lagrange point – 1. This is a point in space between the Sun and the Earth where the combined gravitational attraction on the spacecraft due to the Earth and Sun is just equal to the centrifugal force felt by it. The point is 1.5million kilometres from the Earth
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In one of Isaac Asimov’s novels, co-authored with Robert Silverberg, the home planet exists in a six-star system. What is the name of the novel?
- Kalgash
- Nightfall
- The Naked Sun
- The Light of Other Days
The famous line from the novel is: “If the stars should appear one night in a thousand years, how would men believe and adore, and preserve for many generations the memory of the city of God!”
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