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A paper had ten questions. Each could only be answered as True (T) or False (F). Each candidate answered all the questions. Yet, no two candidates wrote the answers in an identical sequence. How many different sequences of answers are possible?
(a)
(a)20
(b)
40
(c)
512
(d)
1024
(D)
Two trains leave New Delhi at the same time. One travels north at 60 kmph and the other travels south at 40 kmph. After how many hours will the trains be 150 km apart ?
3/2
4/3
3/4
15/2
(A)
In a tournament 14 teams play league matches. If each team plays against every other team once only then how many matches are played ?
105
91
85
78
(B)
A cuboid has six sides of different colours. The red side is opposite to black. The blue side is adjacent to white. The brown side is adjacent to blue. The red side is face down. Which one of the following would be the opposite to brown?
Red
Black
White
Blue
(C)