2891: Total internal reflection can take place when light travels from
(a) diamond to glass
(b) water to glass
(c) air to water
(d) air to glass
2892: Among the following Mughal rulers who was the founder of Mansabdari System?
(a) Akbar
(b) Jahangir
(c) Shahjahan
(d) Aurangzeb
2893: Cloudy nights are warmer compared to clear cloudless nights, because clouds
(a) prevent cold waves from the sky from descending on Earth
(b) reflect back heat given off by Earth
(c) produce heat and radiate it towards Earth
(d) absorb heat from the atmosphere and send it towards Earth
2894: Which of the following events is not correctly matched?
(a) Liberation of Goa : 1961
(b) Death of Jawaharlal Nehru : 1966
(c) Indo-China War : 1962
(d) First General Elections : 1950
2895: Three flags, each of different colour, are available for a military exercise. Using these flags, different codes can be generated by waving
(i) Single flag of different colours, or
(ii) Any two flags in a different sequence of colours, or
(iii) Three flags in a different sequence of colour
The maximum number of codes that can be generated is
(a) 6
(b) 9
(c) 15
(d) 18