1411: In a family, a couple has a son and a daughter. The age of the father is three times that of his daughter and the age of the son is half of his mother. The wife is nine years younger to her husband and the brother is seven years older than his sister. What is the age of the mother ?
(a) 40 years
(b) 45 years
(c) 50 years
(d) 60 years
1412: Urea is prepared by the chemical reaction of:
(a) Ammonia and Carbon dioxide
(b) Ammonium sulphate and calcium chloride
(c) Acetamide and ethyl alcohol
(d) Chlorine and water
1413: Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of
(a) total internal reflection
(b) interference
(c) diffraction
(d) polarisation
1414: Nastaliq was
(a) a Persian script used in medieval India
(b) a raga composed by Tansen
(c) a cess levied by the Mughal rulers
(d) a manual of code of conduct for the Ulemas
1415: Chlorophyll is a/an:
(a) Halogen acid
(b) A green pigment found in the plants
(c) A chloro-organic compound
(d) Element