46. The Rhine river of northern Europe empties into
A. The Baltic Sea
B. The North Sea
C. The Bay of Biscay
D. The Adriatic Sea
47. The place where the material is excavated when the zone of maximum stream velocity approaches the stream’s bed is called
A. Scoured pools
B. Riffles
C. Ox-bow lakes
D. Flood plain
48. The planets called the inner planets, are
A. Jupiter, Saturn, Uranus, Neptune
B. Mars, Jupiter, Saturn, Uranus
C. Saturn, Uranus, Neptune, Pluto
D. Mercury, Venus, Earth, Mars
49. The periodic rise and fall of the sea level on the earth gives rise to tides. This is related to
A. The position of the moon with reference to the earth and the gravitational pull exerted mainly by the moon and partly by the sun
B. Infrared rays from the sun
C. Ultraviolet rays from the sun
D. None of the above
50. The planets that are called superior planets are
A. Mercury, Venus, Earth, Mars and Jupiter
B. Jupiter, Saturn, Uranus, Neptune and Pluto
C. Mercury, Pluto, Venus, Neptune and Earth
D. Earth, Uranus, Mars, Saturn and Jupiter