491: The rainbow and the rainbow-like colours seen on a thin film of oil on a water surface are two phenomena. They are
(a) Similar in nature and both are due to refraction of light
(b) Different in nature and rainbow is due to interference of light, while colour of thin film is due to diffraction
(c) Similar in nature and both are due to interference of light
(d) Different in nature and rainbow is due to refraction, while colour of thin film is due to interference of light
492:
What is the maximum number of different paths that exist between the station A and the station B?
(a) 28
(b) 31
(c) 33
(d) 35
493: Projects and Development India Limited is Mainly engaged is design engineering, procurement and supervision of construction/commissioning in which area?
(a) Pharmaceutical plants
(b) Petroleum refineries and sugar factories
(c) Ship-building yards
(d) Fertilliser and allied chemical plants
494: A car runs at a speed of 40 km per hour during the first half of the journey and at a speed of 60 km per hour during the second half of the journey. The average speed of the car is:
(a) 48 kmph
(b) 50 kmph
(c) 52 kmph
(d) 54 kmph
495: The Chairmen of public sector banks are selected by the
(a) Banks Board Bureau
(b) Reserve Bank of India
(c) Union Ministry of Finance
(d) Management of concerned bank