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A. 75% E. 80% 5.The ratio 2:x , expressed as a percentage , is 40%, then x=……….. A. 3 B. 4 C.5 D. 6 E.8 If a:b=3:8 and b:c=4:5, then a:c=………….. A. 5:11 B. 3:8 C. 3:11 D. 3:10 E. 5:8 If a:b=3:5 and b:c=3:5,

Chords and Tangents In the circle O, diameter AB= 20 cm, and chord AC= 16 cm, OP ⊥AC, then OP=…… A. 8 cm B. 7cm C. 6cm D. 5 cm E. 4cm 2.The distance between the two parallel chords AB and CD is A. 4 cm

) given in the bracket. (7 marks) (a) Proteins is ( polymer, copolymer, monomer). (b) The molecule of (NH3, ClF3, BCl3) does not deviate octet rule. (c) The volume of the gas decreases (rapidly, slowly,

) given in the bracket. (7 marks) (a) Proteins is ( polymer, copolymer, monomer). (b) The molecule of (NH3, ClF3, BCl3) does not deviate octet rule. (c) The volume of the gas decreases (rapidly, slowly,

with ammonia, boron trifluoride behave as an ………. . (g) The IUPAC name of di-methyl methylene is ………. . Select the correct word(s) given in the bracket. (7 marks) (a) Proteins is ( polymer, copolymer,

s with the correct word(s) ,terms. (7 marks) (a) Sodium hydroxide is commercially produced from saturated solution of ………. by using electrolysis. (b) The properties of steel depend upon the ……….. . (c)

s with thsulphide has weak ………. properties. (e) Halogens have essential electronic structure of ………. . (f) In the reaction with ammonia, boron trifluoride behave as an ………. . (g) The IUPAC name of di-methyl

. 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

characteristic ………. smell. (d) Hydrogen sulphide has weak ………. properties. (e) Halogens have essential electronic structure of ………. . (f) In the reaction with ammonia, boron trifluoride behave as an ……….