446: Gypsum is added to cement clinker to
(a) Increase the tensile strength of the cement
(b) Bind the particles of calcium silicate
(c) Decrease the rate of setting of cement
(d) Facilitate the formation of colloidal gel
447: Which one of the following pairs is not correctly matched ?
(a) Cosmic Background Explorer (COBE) : Satellite programme
(b) Falcon : Under-sea cable system
(c) Discovery : Space shuttle
(d) Atlantis : Space station
448: Ibadat Khana at Fatehpur Sikri was
(a) the mosque for the use of Royal Family
(b) Akbar's private prayer chamber
(c) the hall in which Akbar held discussions with scholars of various religions
(d) the room in which the nobles belonging to different religions gathered to discuss religious affairs.
449: The speed of light will be minimum while passing through
(a) glass
(b) vacuum
(c) water
(d) air
450: Ready source of energy is available for athletes in:
(a) Vitamins
(b) Fats
(c) Proteins
(d) Carbohydrates