page 06 10. A proton enters a region of magnetic field as shown. region of magnetic field into page proton On entering the magnetic field the proton A deflects into the page B deflects out of the page C deflects towards the top of the page D deflects towards the bottom of the page E is not deflected. 11. A nuclear fission reaction is represented by the following statement. 1 235 141 1 0 92 56 0 n U Ba X 3 n + → + + The nucleus represented by X is A 96 40Zr B 92 36Kr C 97 40Zr D 93 36Kr E 94 40Zr. 12. The irradiance on a surface 0·50 m from a point source of light is I. The irradiance on a surface 1·5 m from this source is A 0·11I B 0·33I C 1·5I D 3·0I E 9·0I.