4.A bcz entropy of the universe increases n work done in a cyclic process is zero.
9.D bcoz in superconductors energy gap is very less.
22.A right ans n B IS ONLY FOR SINGLE e- system.
23.C IS RIGHT ans for optical branches, B FOR ACOUSTICAL branches.
42.i think its B.
43.its D BCZ IN rotational Raman specrum first stoke line is at 6B.
45.ITS D ONLY.