41) The term 'meteor' is applied to an interplanetary body:
(A) After it enters the atmosphere of the earth
(B) After it enters the earth's atmosphere and explodes in midair as a ball of fire
(C) After it enters the earth's atmosphere and lands on the surface of the earth without exploding in mid-air
(D) Before it enters the earth's atmosphere
42) The time required by moonlight to reach the earth is
(A) 1 sec
(B) l.3 sec
(C) 2 sec
(D) 2.3 sec
43) The shape of our milky way galaxy is
(A) Circular
(B) Elliptical
(C) Spiral
(D) None of the above
44) The correct sequence following planets in terms of gravity in the descending order is
(A) Saturn, Earth, Neptune, Uranus
(B) Neptune, Uranus, Saturn, Earth
(C) Uranus, Earth, Saturn, Neptune
(D) Earth, Uranus, Neptune, Saturn
45) The group of small pieces of rock revolving around the sun between the orbits of Mars and Jupiter are called
(A) Meteors
(B) Comets
(C) Meteorites
(D) Asteroids
46) The only planet whose day is longer than its year is
(A) Mars
(B) Venus
(C) Uranus
(D) Neptune
47) Which one of the following conditions is most relevant for the presence of life on Mars?
(A) Atmospheric composition
(B) Thermal conditions
(C) Occurrence of ice caps and frozen water
(D) Occurrence of ozone
48) The mean distance from the earth to the Sun is
(A) 450 million km
(B) 250 million km
(C) 150 million km
(D) 14 million km
49) Which one of the following stars is nearest to the earth?
(A) Sun
(B) Epsilon Eridani
(C) Alpha Centauri
(D) Sirius
50) Which one of the following planets has the largest oxygen content?
(A) Jupiter
(B) Mercury
(C) Venus
(D) Earth