3976: Consider the following :
I. Saxena, David. Jain and Kumar were District Collectors at places P, Q, R and S respectively in 1970.
II. In 1972 they were transferred. Saxena and Jain interchanged places. Kumar and David also interchanged places.
III. One year later in 1973 they were again transferred such that David and Jain interchanged places and Saxena and Kumar were also interchanged.
What should be the next round of transfers so that all the four persons could have been posted at all the four places ?
(a) Interchange Saxena and David as well as Jain and Kumar
(b) Interchange Saxena and Kumar as well as David and Jain
(c) Interchange David and Kumar as well as Saxena and Jain
(d) It is not possible for all the four persons to have been posted at all the four places
3977: From the third century AD when the Hun invasion ended the Roman Empire, the Indian merchants relied more and more on the
(a) African trade
(b) West-European trade
(c) South-East Asian trade
(d) Middle-Eastern trade
3978: Which of the following was the first to escape out of solar system?
(a) Pioneer 10
(b) Voyager I
(c) Voyager II
(d) Soyuz
3979: What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates/kills the harmful micro-organism in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
3980: There are only two known examples of cave paintings of the Gupta period in ancient India. One of these is paintings of Ajanta caves. Where is the other surviving example of Gupta paintings ?
(a) Ellora caves
(b) Bagh caves
(c) Nasik caves
(d) Lomas Rishi cave