Q:

Is rusting a physical or chemical change?

Answer

In chemistry rusting is called as oxidation. Oxidation is a chemical process where metal gains oxygen and become oxide. In rusting the Iron ore make a chemical reaction with the oxygen in the presence of water and environmental or atmospheric moisture to produce an Iron oxide. Iron oxide is otherwise called as rust.

The rusting of iron is a chemical change because it is two substances reacting together to make a new substance.

Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

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Q:

Which of the following Pratyahara king took the title of 'Pramana'?

A) Mihirbhoj	B) Watsaraj
C) Ram Bhoj	D) Nagabhata II

Answer & Explanation Answer: A) Mihirbhoj

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Q:

If price of an article decreases from P1 to Rs 25, quantity demanded increases from 900 units to 1200 units. If point elasticity of demand is 2 find P1?

A) Rs. 20	B) Rs. 30
C) Rs. 25	D) Rs. 35

Answer & Explanation Answer: B) Rs. 30

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Filed Under: Physics

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Q:

Harshavardhan's Vallabhi conquest is found in which of the following inscriptions?

A) Aihole Pillar Inscription	B) Junagadh Inscription
C) Navsari Copperplate Inscription	D) Damodarpur copper plate Inscription

Answer & Explanation Answer: C) Navsari Copperplate Inscription

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Q:

Compared to land, the open oceans

A) are rich in silica and iron	B) are nutrient-poor environments
C) contain unlimited nitrogen	D) are nutrient-rich environments

Answer & Explanation Answer: B) are nutrient-poor environments

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Q:

What is the general formula of alkenes?

A) CnH2n	B) CnH2n+2
C) CnH2n-2	D) CnH2n-1

Answer & Explanation Answer: A) CnH2n

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Filed Under: Chemistry
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Q:

Which of the following is a microeconomic statement?

A) The price of personal computers declined last year.	B) Unemployment was 6.8 percent of the labor force last year.
C) The real domestic output increased by 2.5 percent last year.	D) The general price level increased by 4 percent last year.

Answer & Explanation Answer: A) The price of personal computers declined last year.

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Q:

What is BGP ?

Answer

It is a protocol used to advertise the set of networks that can be reached with in an autonomous system. BGP enables this information to be shared with the autonomous system.

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