401: If all the numbers from 501 to 700 are written, what is the total number of times does the digit 6 appear ?
(A) 141
(B) 138
(C) 140
(D) 139
402: Genetic code is made up by the four-letter alphabet forming the pairs:
(a) A--C, C--A, T--G, G--T
(b) A--G, G--A, C--A, T--C
(c) T--G, G--T, A--C, C--A
(d) A--T, T--A, C--G, G--C
403: Atmospheric temperature increases at the higher altitudes due to:
(a) Convection
(b) Radiation
(c) Conduction
(d) Inversion
404: Which of the following Muslim rulers enforced price control system ?
(a) Alauddin Khilji
(b) Mohammad Tughlaq
(c) lltutmish
(d) Balban
405: With reference to the guilds (Shreni) of ancient India that played a very important role in the country's economy, which of the following statements is /are correct?
1. Every guild was registered with the central authority of the State and the king was the chief administrative authority on them.
2. The wages, rules of work, standards and prices were fixed by the guild.
3. The guild had judicial powers over its own members.
Select the correct answer using the codes given below :
(a) 1 and 2 only
(b) 3 only
(c) 2 and 3 only
(d) 1, 2 and 3