466: 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
467: In which country is the committee which selects winners for Nobel peace prize located?
(a) Norway
(b) Sweden
(c) Finland
(d) Denmark
468: On the Moon, astronauts inflate a rubber balloon with hydrogen gas and release it at a height of 2 metres. The balloon will:
(a) Fall down
(b) Go upwards
(c) Remain at the height of 2 metres
(d) First go up and finally come down
469: The colour of an opaque object is due to the colour it
(a) absorbs
(b) refracts
(c) reflects
(d) scatters
470: In India, during the last decade the total cultivated land for which one of the following crops has remained more or less stagnant ?
(a) Pulses
(b) Oilseeds
(c) Rice
(d) Sugarcane