71. The Palaeozoic era contains ____ time periods.

A. Six
B. Four
C. Five
D. Seven

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72. The northern portion of the western coastal plain is called

A. Konkan plain
B. Malabar coast
C. Coromandel coast
D. None of the above

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73. The ozone layer at high altitude contains

A. Atomic oxygen (O) and ordinary oxygen (O₂)
B. Only ozone (O₃)
C. Mixture of atomic oxygen (O), ordinary oxygen (O₂) and Ozone (O₃)
D. Only ordinary oxygen (O₂)

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74. The number of a topographic map is 47A/16/NW. Its scale must be

A. 1 : 250,000
B. 1 : 100,000
C. 1 : 50,000
D. 1 : 25,000

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75. The right ascension is the equivalent of longitude on the celestial sphere, and it is given in the units of

A. Degrees
B. Time-hours, minutes and seconds
C. Only hours
D. Only seconds

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