Answer: B) Oxygen Explanation: Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.

Answer: A) Colonial ports Explanation: Oceania is a geographic region comprising Melanesia, Micronesia, Polynesia and Australasia. In Oceani, most towns began as Colonial Ports.

Answer: A) Succession Explanation: The process which wherein an Ecosystem may renew itself is known as Ecological Succession. The time scale may be decades or a million of years after a mass extinction.  It may be achieve over a period of time.

Answer: D) All of the above Explanation: Expendable properties are those properties that are consume in use or that lose their identity in use. It also include those properties that become an integral part of other property when put to use and those properties which have an expected service life of less than one year.

Answer: A) Longitudinal waves Explanation: Compressions and Rarefactions are characteristic of Longitudinal waves. The direction of vibration of the particles is in the same plane as in which the wave is propagating. The particles vibrate back and forth, about their mean positions.

Answer: A) Bengaluru Explanation: Bengaluru becomes the first Indian city to get its very own logo Much like New York and Singapore, Bengaluru is set to get its own logo, becoming the first Indian city to do so.

Answer: B) 97 Explanation: 9506= 97.50 So 97 and 98 are the two numbers.    so 97 is the answer

Answer: B) 40% Explanation: Lets say shyam sells at 100,   Since Ram sells 25% cheaper than Shyam,   Therefor Ram sells at less than 25% of100 or 75 rs.   Ram sells 25% dearer than Bram or 125% of Ram =100% of Bram or   125% of x (say x price of bram )=75rs.or 100% of x =60rs.hence price of bram is 60rs.   now Bram's good is cheaper than Shyam's as (100-60)x100/100% or 40%.   Hence Brams Good is 40% cheaper than that of Shyam's good.