GENERAL PRINCIPLES & PROCESS OF ISOLATION OF ELEMENTS MCQ 2022

In the process of recombinant DNA technology, the isolated foreign DNA is inserted into another DNA molecule known as

One of the processes used for concentration of ores is Froth floatation process. This process is generally used for concentration of sulphide ores. Sometimes in this process we add NaCN as a depressant. NaCN is generally added in case of ZnS and PbS minerals. what is the purpose of addition of NaCN during the process of Froth floatation?

Statement - 1 : Pine oil is fused as a foaming agent in froth floatation process. And Statement - 2 : Adsorption principle is involved in froth floatation process.

Assertion : In an isolated system the entropy increases. Reason : The processes in an isolated system are adiabatic.

Which enzyme is use for removal of RNA molecule in DNA isolation process.

Some statements are given with regard to entropy. The incorrect statement(s) are (A) The absolute entropy of substances cannot be determined (B) In standard state entropy of elements is always positive (C ) The entropy of universe always decreases (D) In a spontaneous process, for an isolated system the entropy of the system generally increases

Which principle says that allele frequencies in a population are stable and is constant generation to generation. p^(2)+2pq+q^(2) = 1

Explain the following observation: (i) Generally there is an increase in density of elements from titanium (Z=22) to copper (Z=29) in the first series of transition elements. (ii) Transition elements and their compounds are generally found to be catalysts in chemical reactions.

Draw a schematic sketch of an generator describing its basic elements. State briefly its working principle. Show a plot of variation of (i) Magnetic flux and (ii) Alternating emf versus time generated by a loop of wire rotating in a magnetic field. (b) Why is choke coil needed in the use of fluorescent tubes with ac mains?

Describe briefly, with the help of a labell diagram, the basic elements of an A.C. generator. State its underlying principle. Show diagrammatically how an alternating emf is generated by a loop of wire rotating in a magnetic field. Write the expression for the instantaneous value of emf induced in the rotating loop.