61 .The waves used in sonography are -
62 .If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
63 .Which is the fastest mode of heat loss?
64 .Biodiversity is richer in:
65 .If the temperature inside a room is increased, the relative humidity will
66 .The 'super bug' used in controlling oil pollution is:
67 .A digital signal possesses:
68 .Satellite having the same orbital period as the period of rotation of the Earth about its own axis is known as:
69 .The phenomenon of interference is shown by
70 .A geostationary satellite should be launched such that it moves from:
71 .Which famous scientist was the first to look at the night sky throught a telescope?
72 .The ozone layer absorbs
73 .A plant with green leaves placed in red light will appear
74 .Which of the gas is not known as greenhouse gas?
75 .Which one of the following pairs ofrays is electromagnetic in nature -