7. When NASA\'s New Horizons flew by Pluto last summer, it was 32 AU away from t

Question

7. When NASA's New Horizons flew by Pluto last summer, it was 32 AU away from the Earth. Ifan engineer sent a signal to the probe at that time, how much time did the signal take to reach the probe? a. About 4 second b. About 4 minutes c. About 4 hours d. About 4 days 8. Which of these gases is a greenhouse gas? a. Co b, 03 d. CH. e. All of the above 9. Which of the following surface features of a terrestrial planet is not a consequence of geologic activity? a. Volcanoes b. "Planet quakes" c. Craters d. Geysers 10. Which of the bright stars in the orion constellation is the coldest (see Figure 1)? a. Bellatrix b. Betelgeuse c. Rigel d. Saiph e. It is impossible to determine this from only this image 11. What is the core of giant planets made of? a. A mixture of rock and iron b. Pure gas, mostly hydrogen and helium c, Ices of water, ammonia and methane d. A mixture of these three components in roughly equal proportions 12. The first extrasolar planets to be discovered were Hot Jupiters.Why is that? a. They are the easiest to discover b. They are the most common type of planets in the Galaxy c. Astronomers had devised instruments that were designed to search for planets exactly like these but that were unable to detect other types of d. This is just a coincidence 13. At what speed does the top of Saturn's atmosphere rotate along its equator? a. About 40 km/h b. About 400 km/h c. About 4000 km/h d. About 40000 km/h 14. Mercury has a significantly eccentric orbit around the Sun (e 0.2). Which statement about the force of gravity that the Sun exerts on it is correct? a. The force is strongest at apoastron b. The force is strongest at periastron c. The force remains the same throughout its orbit

Explanation / Answer

(7)
Distance = 32 Au = 1.496 * 10^11 km
Speed = 3.0 * 10^8 m/s
Time = Distance/speed
t = ( 1.496 * 10^11)/ (3.0*10^8)
t = 4.4 hr

Correct option :- Approximately 4 hours

(8)
All of the above are Green house gases !!

(9)
Correct Option !!
Craters !!

(10)
Figure is not mentioned !!

(11)
Correct option :- (d)

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