Hailey’s comet is visible after every_________?
A. 84 years
B. 76 years
C. 1000 years
D. 365 years
Which of the following spacecraft enabled man to step on the moon first?
A. Spuntnik I
B. Luna II
C. Vostok I
D. Apollo XI
Among the planets of the Solar system the position of the Earth from the Sun is:_________?
A. Second
B. Third
C. Fourth
D. Sixth
Most important effect of the moon on earth is that it___________?
A. Causes weather change
B. Causes earthquakes
C. Causes solar and lunar eclipse
D. Effects tides of the ocean
The Lunar eclipse occurs when:
A. Moon is b/w the earth and the sun
B. Earth is b/w the sun and the moon
C. Sun is b/w the earth and the moon
D. Earth is at right angles to the direction of the sun and the moon
Who was the first to measure the earth’s radius.
A. Galileo
B. Copernicus
C. Ptolemy
D. Eratosthenes
Which of the following planets has the smallest diameters_____?
A. Mercury
B. Marx
C. Pluto
C. Venus