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| 241)A comet | |||
| Has a tail always pointing away from the sun | Has a tail always pointing towards the sun | ||
| Has a tail sometimes pointing towards the sun and sometimes away from the sun | Does not have any tail | ||
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| 242)What is the significance of the time-period 26000 years in relation to the earth? | |||
| It represents the time period needed for conical movement of the earth's axis around a line joining the ecliptic poles for one complete round | It represent the time taken by the earth along with the sun and other planets to complete one round in the galaxy | ||
| It represents the time period in which earth's atmosphere shows perceptible change in its composition | None of these | ||
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| 243)Which of the following statements regarding the movement of the planets round the sun is false? | |||
| The speed of movement of the planets are not constant | Speed is maximum when the plantes are nearer to the sun | ||
| Speed is maximum when the planets are farther from the sun | Speed is less when the planets are farther from the sun | ||
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| 244)Whose astronomical observation did Johannes Kepler used to formulate his three laws of planetary motion? | |||
| Nicolas Copernicus | Galileo Galilei | ||
| Tycho Brahe | Ptolemy | ||
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| 245)The study of motion of of which of the following planets around the sun led Johannes Kepler to formulate his famous three laws of planetary motion? | |||
| Mars | Venus | ||
| Mercury | Saturn | ||
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| 246)"Galileo Satellites" are four large moons of the planet | |||
| Neptune | Saturn | ||
| Jupiter | Uranus | ||
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| 247)Who was the first person to measure the size of another planet? | |||
| Galileo Galilie | Issac Newton | ||
| Christian Huygens | Giordano Bruno | ||
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| 248)Who was the first to speculate thet Venus is completely covered with clouds? | |||
| Giordano Bruno | Copernicus | ||
| Christian Huygens | Descartes | ||
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| 249)What quantity of hydrogen in the sun is converted into helium every second? | |||
| 4 X 1014 grams | 3 X 1018 grams | ||
| 2 X 1024 grams | 2 X 1040 grams | ||
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| 250)How many hydrogen neclei combine to form a helium nucleus in the sun. | |||
| 2 | 4 | ||
| 3 | 5 | ||
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| 251)Titan is the moon of | |||
| Jupiter | saturn | ||
| Uranus | None of these | ||
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| 252)The name of the path of the sun amongst the stars in our galaxy is | |||
| Ecliptic | Celestial sphere | ||
| Elliptical path | Zodiacal path | ||
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| 253)The visible part of the sun is called | |||
| Troposphere | Hydrosphere | ||
| Heliosphere | Photosphere | ||
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| 254)In sixteenth century the king of Denmark built the finest observatory in the world on an island near Copenhagen and called it city of heavens, for the use of a famous scientist. Who was the scientist? | |||
| Nicolas Copernicus | Issac Newton | ||
| Tycho Brahe | Galileo Galilei | ||
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| 255)Which of the following statements in regard to the planets of the solar system is not correct? | |||
| All the planets move round the sun in different elliptic paths | All the planets rotate from west to east on its axis | ||
| All the planets are made up of rocks and metals | All the planets shine because they reflect the sun light | ||
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