86: Which of the following gives Global Gender Gap Index ranking to the countries of the world?
(a) World Economic Forum
(b) UN Human Rights Council
(c) UN Women
(d) World Health Organization
87: The process of retting in jute is
(a) Purely physical
(b) Purely chemical
(c) Microbiological
(d) Physico-chemical
88: Triple Antigen does not immunise against:
(a) Diphtheria
(b) Tetanus
(c) Typhoid
(d) Whooping cough
89: Hybridisation is useful in developing improved crops by:
(a) Creating new and better genes
(b) Eliminating undesirable genes
(c) Producing favourable combination of genes
(d) By encouraging favourable genes and removing unfavourable ones
90: In which one among the following is the speed of sound maximum ?
(a) Air at 100 degree celcius
(b) Air at 0 degree celcius
(c) Wood
(d) Water
Explanation:
Speed of sound is maximum in solids followed by liquuids and gases. Speed of sound in different media :
Medium Speed (m/s)
Air (0 deg C) : 331
Air (100 deg C) : 386
Water : 1460
Pine wood : 3320
Glass : 5500