What should be done to increase the pitch of a string instrument? I. Increase the length of the string used II. Decrease the gauge of the string used III. Loosen the string IV. Tighten the string Options: I and IV II and IV I, II and IV I and II

False statement regarding second law of thermodynamics is:

It is impossible to construct a machine working in cycles which transforms heat from a lower temperature region to higher temperature. Heat cannot flow from a colder body to a hotter region without intervention of any external agency. For any spontaneous process taking place in an isolated system $\Delta S < 0$. All spontaneous processes are thermodynamically irreversible and entropy of the system increases in all spontaneous processes.

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar? Does water dissolve an equal amount of salt and sugar? What can be done to dissolve more salt in a saturated solution of water and salt? Name two other things that dissolve in water.

Mr. Tamam Baum is the Director of Agriculture (DAG) in a state. He reports directly to the Agricultural Production Commissioner (APC) of the state. Recently, the Directorate of Agriculture has recruited Mr. Prakash Chawla, who had an outstanding scholastic record from Delhi School of Economics and Cornell University. The APC has organized a meeting of various heads of departments such as Directors of Co-operation, Agriculture Marketing, etc. In the meeting, the APC asks Prakash to take note of the proceedings, although the APC has a full-time stenographer and private secretary working for him. After the meeting, Prakash, visibly annoyed, talks to Tamam to express his disappointment that he was asked to write the proceedings. What should Tamam do?

1. Admonish Prakash for such a childish approach.

2. Listen carefully and report to the APC, noting that super-kids often come with very high expectations.

3. Explain to Prakash the importance of such a high-level meeting and clarify that this task enables a newcomer to grasp the subject and practical issues better.

4. Listen attentively and inquire how his overall experience in the Directorate has been. Then explain how writing minutes of the meeting familiarizes a new entrant with real issues.

I have two doubts please answer them. What are the ways to prevent rust? When is a substance said to be reduced in a chemical reaction?

An object of mass, $m$ is moving with a constant velocity, $v$. How much work should be done on the object in order to bring the object to rest? 100 words