491: The Supersonic jets tend to cause:
(a) Destruction of ozone layer
(b) Sound pollution
(c) Nervous system breakdown
(d) All of the above
492: Schemes of (i) Urban Micro Enterprises, (ii) Urban Wage Employment, and (iii) Housing and Shelter Upgradation are parts of
(a) Integrated Rural Development Programme
(b) Nehru Rozgar Yojana
(c) Jawahar Rozgar Yojana
(d) Prime Minister's Rozgar Yojana
Explanation:
Schemes of (i) Urban Micro-Enterprises, (ii) Urban Wage Employment and (iii) Housing and Shelter Upgradation are parts of 'Nehru Rajgar Yojana' which was started in the year 1989.
493: It has been found recently that the acidity of the soil increases because of:
(a) Leaching away of bases
(b) Increased use of ammonia
(c) Increased use of urea
(d) Increased use of rock phosphate
494: Low temperatures (Cryogenics) find application in
(a) space travel, surgery and magnetic levitation
(b) surgery, magnetic levitation and telemetry
(c) space travel, surgery and telemetry
(d) space travel, magnetic levitation and telemetry
Explanation:
Cryogenic engine is used for rocket propulsion particularly GSLV of space programme and ballistic missiles. 'Cryogenic technology' is used in production of very high magnetic field and remote sensing.
495: Among the following, which one is the largest exporter of rice in the world in the last five years?
(a) China
(b) India
(c) Myanmar
(d) Vietnam
Explanation:
India has been the worlds top rice exporter since the beginning of this decade. India emerged the worlds largest rice exporter in 2011-12, displacing Thailand from its leadership position.
Source: India Today, The Hindu, Economic Times, Worldatlas.com