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Which of the following is/are correct about minerals and rocks (A) Generally metallic minerals are found in igneous and metamorphic rocks. (B) If a rock contains copper then the rock looks blue in color.  (C) Al ore minerals are not rocks. (D) All rocks are not ore minerals. 
Which of the following statement(s) is/are correct?
1. If sodium carbonate and washing soda is mixed in water the hardness of water can be removed.
2. The reaction of the chemicals produce sodium sulphate, sodium carbonate and insoluble calcium carbonate.
3. Magnesium sulphate chloride and magnesium carbonate is also produced.
Select the correct answer
Metallic composites consist of a metallic matrix strengthened by metallic or nonmetallic fibers, filaments or whiskers.
A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?
Which of the following statements about minerals are correct? (A) Minerals are created by natural processes without any human interference (B) Mica and chromite are nonferrous minerals (C) Minerals lying at shallow depths are taken out through open cast mining (D) Minerals are a non-renewable resource
Which of the following is true regarding the metallic nature of minerals? I. Metallic nature is directly proportional to electropositive nature. II. Metallic nature in period increases. III. Metallic nature in groups increases.
A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl.  Assume adding salt doesn’t change its volume and find the ratio of x and y. 
With reference to the management of minor minerals in India, consider the following statements: 1. Sand is a 'minor mineral' according to the prevailing law in the country. 2. State Governments have the power to grant mining leases of minor minerals, but the powers regarding the formation of rules related to the grant of minor minerals lie with the Central Government. 3. State Governments have the power to frame rules to prevent illegal mining of minor minerals. Which of the statements given above is/are correct?
The question given below consists of a statement, followed by three arguments I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments, is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: Over the past five decades, term deposits in banks have emerged as the primary instrument of financial savings for the average Indian after former premier Indira Gandhi embarked on a mission to nationalise the lenders - 14 in the first tranche - on a rainy afternoon in July 1969. Coming with an unsaid sovereign guarantee of sorts, fixed deposits (FDs) seemingly offered investors liquidity - and safety - as nationalisation sought, in part, to arrest the 40-odd bank failures a year.  Now, however, deposits must burnish their allure to retain leadership status in an increasingly crowded financial marketplace that offers choice. Why? Arguments: I. If FDs are giving 7.5% and the effective tax rate is 10%, one gets close to 5-5.2% return. Similarly, in the case of FMP, if the rate is 7.5%, effective taxation comes to 10%, one gets 6.75%. It is higher than the effective returns on bank deposits.  II. People are becoming aware of more asset classes that offer better returns, and the quest for such assets became more pronounced after interest rates fell substantially over the past four years.  III. Savers are looking at mutual funds and provident funds for the higher return. 
Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it.
Crude mineral oil comes out of the earth as a thick brown or black liquid with a strong smell. It is a complex mixture of many different substances, each with its own individual qualities. Most of them are combinations of hydrogen and carbon in varying proportions. Such hydrocarbons are also found in other forms such as bitumen, asphalt and natural gas. Mineral oil originates from the carcasses of tiny animals and from plants that live in the sea. Over million of years, these dead creatures form large deposits under sea­bed and ocean currents cover them with a blanket of sand and silt. As this material hardens, it becomes sedimentary rock and effectively shuts out the oxygen, thus preventing the complete decomposition of the marine deposits underneath. The layers of sedimentary rocks become thicker, and heavier. Their pressure produces heat, which transforms the tiny carcasses into crude oil in a process that is still going on today.
The time taken for the marine deposits to harden into rocks is