46: Pumice is derived from:
(a) Volcanic rock
(b) Sedimentary rock
(c) Igneous rock
(d) Acid lava
47: 'Hand-in-Hand 2007', a joint anti-terrorism military training was held by the officers of the Indian Army and Officers of Army of which one of the following countries?
(a) Japan
(b) China
(c) Russia
(d) USA
48: Age of tree can be estimated by:
(a) Counting the number of concentric rings
(b) Counting the nodes and internodes of the trunk
(c) Measuring the girth of the tree trunk
(d) Counting the number of branches
49: What is "Virtual Private Network" ?
(a) It is a computer network across a public internet that provides users access to their organization's network while maintaining the security of the information transmitted
(b) It is a private computer network of an organization where the remote users can transmit encrypted information through the server of the organization
(c) It is a computer network in which users can access a shared pool of computing resources through a service provider
(d) None of the statements (a), (b) and (c) given above is a correct description of Virtual Private Network
50: The Kelkar proposals which were in the news recently were the
(a) recommendations for reforms in the power sector
(b) recommendations for tax reforms
(c) guidelines for the privatisation
(d) guidelines for reducing vehicular pollution, and the promotion of CNG use