|With reference to comets, consider the following statements?|
|1. They revolve around the sun along a circular orbit.|
|2. The tail of the comet always points towards the sun during its revolution due to sun's gravitational force.|
|3. Halley's Comet completes one revolution around the sun in 76 years.|
|4. The next appearance of the Halley's Comet near the earth will be in the year 2061. Which of the above statement (s) is/are correct?|
A) 1 only
B) 2 and 3 only
C) 3 and 4 only
D) 1, 2, 3 and 4
Correct Answer: C
Solution :[c] In most cases the orbit of a comet is an elongated narrow ellipse and they do not follow circular path. The tail of a comet is dragged away from the sun because the presence of solar wind drives off the tail from the head of the comet. It is true that Halley's Comet completes one revolution around the sun in 76 years and its last visit to the earth was in 1985-86. Hence its next visit is due in 2061.
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