2056: With reference to medieval Indian rulers, which one of the following statements is correct ?
(a) Alauddin Khalji first set up a separate ariz's department
(b) Balban introduced the branding system of horses of military
(c) Muhammad bin Tughlaq was succeeded by his uncle to the Delhi throne
(d) Firoz Tughlaq set up a separate department of slaves
2057: Where is Copacabana Beach located ?
(a) Hawaiian Islands
(b) Valletta
(c) Rio de Janeiro
(d) Buenos Aires
2058: By a regulation in 1793, the District Collector was deprived of his judicial powers and made the collecting agent only. What was the reason for such regulation?
(a) Lord Cornwallis felt that the District Collector's efficiency of revenue collection would enormously increase without the burden of other work
(b) Lord Cornwallis felt that Judicial power should compulsorily be in the hands of Europeans while Indians can be given the job of revenue collection in the districts
(c) Lord Cornwallis was alarmed at the extent of power concentrated in the District Collector and felt that such absolute power was undesirable in one person
(d) The judicial work demanded a deep knowledge of India and a good training in law and Lord Cornwallis felt that District Collector should be only a revenue collector
2059: An astronaut weighing 100 kg fires a bullet weighing 1 kg with a gun of 10 kg at the speed of 50 metres/second. What will be the recoil velocity of the gun ?
(a) 5 cm/s
(b) 50 cm/s
(c) 0.5 cm/s
(d) 0.05 cm/s
2060: Cobalt-60 is commonly used in radiation therapy because it emits
(a) alpha rays.
(b) beta rays.
(c) gamma rays.
(d) X-rays.