chem cet

If we convert 135° to radian measure, we get
A.3π/4 B.3π/2 C.π/4 D.π/2 E.(3+π)/2

1. 75° in radian measure is
   A.π/75 B.75/π C.5π/12 D.12π/5 E.π/30
   3.An arc PQ subtends an angle 60° at the centre O of radius 3 cm. The area of the sector POQ is
   A. 270 〖cm〗^2 B. 3/2 〖cm〗^2 C. 3π/2 〖cm〗^2 D. 3π 〖cm〗^2 E. 180 〖cm〗^2
   4.A sector of a circle has arc length of 8 cm and the area of 16 cm2,then the radius of the circle
   in cm , is
   A. 2 B. 3 C.5 D. 48 E. 12
2. OAB is a sector of a circle with centre O, radius 8 cm
   . Let S = {1,2,3,4,5,6,7,8,9} and A = { 1,2,3,4,5}, B = { 2,4,6,8}. Find (a) A^' (b) B^'
   (c) A^'∩B^' (d) A∪B (e) (A∪B)^' what can you say about A^'∩B^' and (A∪B)^'?
3. S = {1,2,3,4,5,6,7,8}, A = {1,2,3,5,7}, B = {1,3,5,7}, C = {2,4,6,8}
   (i) List the sets A^', B^'and C^'.
   (ii) State whether each of the following is true or false.
   (a) A∩A^'=∅ (b) A∪A^'=∅ (c) A⊂B (d) B⊂A
   (e) A^'⊂B^' (f) B^'⊂A^' (g) B^'=C (h) B⊂C^'