IIT-JEE Exam

Two spherical planets P andQ have the same unfirom density ,massesMP andMQ, an surface areas A and 4A, respectively. A spherical planet R also has unfirom density and its mass is (MP + MQ) . The escape velocities from the planets P, Q and R, are VP, VQ and V respectivley. Then
option
(A) VQ > VR > VP
(B) VR > VQ > VP
(C) VR/VP = 3
(D) VP /VQ =1/2

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IIT-JEE Other Question
A current carrying infinitely long wire is kept along the diameter of a circular wire loop,without touching it. The
correct statement (s) is (are) :
(A) the emf induced in the loop is zero if the current is constant.
(B) The emf induced in the loop is finite if the current is constant.
(C) The emf induced in the loop is zero if the current decreases at a steady rate.
(D) Theemf induced in the loop is finite if the current decreases at a steady rate. NiCl2 {P (C2H5)2 (C6H5)}2 exhibits temperature dependentmagnetic behaviour (paramagnetic/ diamagnetic) .
the coordination geometries of Ni2+ in the paramagnetic and diamagnetic states are respectively
(A) tetrahedral and tetrahedral
(B) square planar and square planar
(C) tetrahedral and square planar
(D) square planar and tetrahedral