sound travels at maximum speed in A. steel B. water C. air D. vacuum

The speed of sound depends on the medium in which it is transported. Sound travels fastest through solids, slower through liquids and slowest through gases. the collision between particles is what mediates the propagation of sound. In fact, the sound is just a disturbance. This disturbance propagates better when the material it is traveling in is more "stiff" and has lower density. This is directly understood from the Newton-Laplace equation for the speed of sound. The speed of sound is the distance traveled per unit time by a sound wave as it propagates through an elastic medium. The speed of sound in air is about 343 meters per second.

Solar energy is due to A. Chemical reaction B. Combustion reaction C. Nuclear fission reaction D. Nuclear fusion reaction

Solar Energy is the energy coming from the Sun. The sun generates energy in its core in a process called nuclear fusion. During nuclear fusion, the sun's extremely high pressure and hot temperature cause hydrogen atoms to come apart and their nuclei (the central cores of the atoms) to fuse or combine. This phenomenon is termed as Nuclear Fusion.

For which of the following disciplines is Nobel Prize awarded? A. Literature, Peace and Economics B. Physics and Chemistry C. Physiology or Medicine D. All of the above

The Nobel Prize is a set of annual international awards bestowed in several categories by Swedish and Norwegian institutions in recognition of academic, cultural, or scientific advances. The will of the Swedish scientist Alfred Nobel established the five Nobel prizes in 1895. he prizes in Chemistry, Literature, Peace, Physics, and Physiology or Medicine was first awarded in 1901. The prizes are widely regarded as the most prestigious awards available in the fields of chemistry, literature, peace activism, physics, and physiology or medicine. There is no prize for Mathematics discipline. Fields medal is considered to be the Nobel prize in Mathematics.

Friction can be reduced by changing from A. Rolling to sliding B. Sliding to rolling C. Dynamic to static D. Potential energy to kinetic energy

Friction: It is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. There are several methods to reduce friction i.e. the use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example. We can also replace sliding friction with rolling element friction, such as with the use of rolling element bearings.

The element common to all acids is A. Hydrogen B. Carbon C. Sulphur D. Oxygen

Hydrogen is the most common element of all the acids. There are some acids which don't have Carbon, Oxygen. But there is none without Hydrogen. Lets take a few examples to make it simple:HCl - hydrochloric acid; HNO3 - nitric acid; H2SO4 - sulfuric acidHBr - hydrobromic acidHI - hydroiodic acidHClO4 - perchloric acidHClO3 - chloric acidH2SO3 - sulfurous acidHSO4 - - hydrogen sulfate ion H3PO4 - phosphoric acid HNO2 - nitrous acid HF - hydrofluoric acidHCO2H - methanoic acidC6H5COOH - benzoic acidCH3COOH - acetic acidHCOOH - formic acid According to the Brønsted–Lowry acid-base theory and also the Arrhenius acid-base theory all acids contain Hydrogen.

The topology with highest reliability is: A. Bus topology B. Star topology C. Ring topology D. Mesh topology

Network topology is the arrangement of the elements of a communication network. Network topology can be used to define or describe the arrangement of various types of telecommunication networks, including command and control radio networks, industrial field busses, and computer networks. The different types of topologies are Ring, Star, Mesh, Bus, etc. A bus topology is a topology for a Local Area Network (LAN) in which all the nodes are connected to a single cable. The cable to which the nodes are connected is called a "backbone". If the backbone is broken, the entire segment fails. A star topology is a topology for a Local Area Network (LAN) in which all nodes are individually connected to a central connection point, like a hub or a switch. A star takes more cable than e.g. a bus, but the benefit is that if a cable fails, only one node will be brought down. A ring network is a network topology in which each node connects to exactly two other nodes, forming a single continuous pathway for signals through each node - a ring. Data travels from node to node, with each node along the way handling every packet. A mesh network is a local network topology in which the infrastructure nodes connect directly, dynamically and non-hierarchically to as many other nodes as possible and cooperate with one another to efficiently route data from/to clients. Of all these, Star Topology is highly reliable one.

Non-metallic minerals are found in A. Igneous rocks B. Metamorphic rocks C. Sedimentary rocks D. All of the above

Non-metallic minerals are found in Sedimentary rocks. Non-metallic mineral reserves consist of stone quarries and clay and sand pits; chemical and fertilizer mineral deposits; salt deposits; deposits of quartz, gypsum, natural gemstones, asphalt and bitumen, peat and other non-metallic minerals other than coal and petroleum. These Non-metallic minerals are found in Sedimentary rocks. Sedimentary rocks are types of rocks that are formed by the accumulation or deposition of small particles and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.

Garampani sanctuary is located at A. Gangtok, Sikkim B. Kohima, Nagaland C. Diphu, Assam D. Junagarh, Gujarat

Garampani Wildlife Sanctuary is a 6.05-square-kilometer (2.34 sq mi) wildlife sanctuary located in Karbi Anglong district, Assam, India. It is 25 km (16 mi) from Golaghat. It is one of the oldest sanctuaries containing hot water spring and waterfalls and surrounded by Nambour Sanctuary having 51 rare species of orchid. It is located at Diphu, Assam.

Grand Central Terminal, Park Avenue, New York is the world's A. Highest railway station B. Longest railway station C. Largest railway station D. None of the above

Grand Central Terminal is a commuter rail terminal located at 42nd Street and Park Avenue in Midtown Manhattan, New York City. Grand Central is the southern terminus of the Metro-North Railroad's Harlem, Hudson and New Haven Lines, serving the northern parts of the New York metropolitan area. Grand Central Terminal, located in the heart of Midtown Manhattan, has more than 40 platforms.

The colour of soil which is formed by basalt A. Red B. Yellow C. White D. Black

Basalt is an igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. According to estimates, more than 90% of all volcanic rocks on Earth contain basalt. Basalt is a dark-colored, fine-grained, igneous rock formed as an extrusive rock, such as a lava flow. Basalt is used for a wide variety of purposes. It is most commonly crushed for use as an aggregate in construction projects. Crushed basalt is used for road base, concrete aggregate, asphalt pavement aggregate, railroad ballast, filter stone in drain fields, and may other purposes.