1146: A fan makes a hot noon to feel cool by:
(a) Blowing out hot air
(b) Increasing the rate of evaporation
(c) Letting in cool air
(d) Regulating the air flow
1147: Consider the following which can be found in the ambient atmosphere:
1. Soot
2. Sulphur hexafluoride
3. Water vapour
Which of the above contribute to the warming up of the atmosphere ?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
1148: Which one of the following diseases is least infectious ?
(a) Leprosy
(b) Tuberculosis
(c) Conjunctivitis
(d) Hepatitis
1149: In track meets both 100 yards and 100 metres are used as distances. By how many metres is 100 metres longer than 100 yards ?
(a) 0.856 m
(b) 8.56 m
(c) 0.0856 m
(d) 1.0 m
1150: Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
(a) barium allows X-rays to pass through the stomach on account of its transparency to X-rays
(b) barium compound, like magnesium sulphate helps in cleaning the stomach before X-ray examination
(c) barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
(d) barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the picture