591: With reference to the religious history of medieval India, the Sufi mystics were known to pursue which of the following practices?
1. Meditation and control of breath
2. Severe ascetic exercises in a lonely place
3. Recitation of holy songs to arouse a state of ecstasy in their audience
Select the correct answer using the codes given below :
(a) 1 and 2 only
(b) 2 and 3 only
(c) 3 only
(d) 1, 2 and 3
592: Endoscopy, a technique used to explore the stomach or other inner parts of the body is based on the phenomenon of
(a) total internal reflection
(b) interference
(c) diffraction
(d) polarisation
593: Among the four pairs given below which one consists of a correct combination of dignitaries who became Vice-Presidents after having held diplomatic posts like Ambassadors and High Commissioners?
(a) Dr. S. Radhakrishnan and G.S. Pathak
(b) Dr. S. Radhakrishnan and V.V. Giri
(c) Dr. Zakir Hussain and K.R. Narayanan
(d) B.D. Jatti and K.R. Narayanan
594: Recently, there has been a concern over the short supply of a group of elements called 'rare earth metals'. Why?
1. China, which is the largest producer of these elements, has imposed some restrictions on their export.
2. Other than China, Australia, Canada and Chile, these elements are not found in any country.
3. Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.
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
595: Antigen is a substance which
(a) destroys harmful bacteria
(b) is used to treat poisoning
(c) lowers body-temperature
(d) stimulates formation of antibody