726: During a thunderstorm, the thunder in the skies is produced by the
1. meeting of cumulonimbus clouds in the sky
2. lightning that separates the nimbus clouds
3. violent upward movement of air and water particles
Select the correct answer using the codes given below.
(a) 1 only
(b) 2 and 3
(C) 1 and 3
(d) None of the above produces the thunder
727: The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is
(a) Troposphere, Stratosphere, Ionosphere, Mesosphere
(b) Stratosphere, Troposphere, Ionosphere, Mesosphere
(c) Troposphere, Stratosphere, Mesosphere, Ionosphere
(d) Stratosphere, Troposphere, Mesosphere, Ionosphere
728: Hypochondria is a:
(a) Disease of eyes
(b) Disease of sexual organs
(c) Disease of low blood pressure
(d) State of morbid anxiety about one's own health, with complaint of imaginary disorders
729: Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?
(a) Microscope
(b) Lead plate
(c) Scintillation counter
(d) Spectrophotometer
730: In the 19th century the people who participated in the national movement were mostly:
(a) Zamindars
(b) Rich people
(c) Educated middle class
(d) Poor people