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Multiple Choice Question with Only One Choice Correct
The driver of a train A moving at a speed of 30 ms^-1 sights another train B moving on the same track towards his train at a speed of 10 ms^-1. He immediately applies brakes and achieves a uniform retardation of 4 ms^-2. To avoid head-on collision, what must be the minimum distance between the trains ?

(a)	100 m	(b)	200 m
(c)	300 m	(d)	400 m

Chemistry

Multiple Choice Question
Which of the following statements regarding a liquid is not correct ?
(a) The SI unit of viscosity is Pa s
(b) 1 Pa s = 10 Poise
(c) The viscosity of a liquid decreases with increase in temperature
(d) The viscosity of a gas decreases with increase in temperature

Mathematics

If z = x + iy and w = (1 - iz)/(z - i), then |w| = 1 implies that, in the complex plane,
(a) z lies on the imaginary axis
(b) z lies on the real axis
(c) z lies on the unit circle
(d) None of these

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