71. The spiral flow in a stream caused by channel shape is called

A. Stream flow
B. Laminar flow
C. Turbulent flow
D. Helical flow

72. The storms or frontal systems develop where

A. Air is rising
B. Atmospheric pressure is low
C. At the equator and in the mid-latitudes
D. All of the above

73. The subatomic particles arriving from outer space having high energy are called

A. Protons
B. Electrons
C. Cosmic rays
D. None of the above

74. The strongest bonds exist between the particles found within

A. Metamorphic rocks
B. Igneous rocks
C. Sedimentary rock
D. All have similar strength of bonds

75. The snow line on the northern side of greater Himalayas range about

A. 4,500 to 6,000 metres
B. 5,500 to 6,000 metres
C. 3,500 to 6,000 metres
D. None of the above