Swathi kept a laboratory thermometer in hot water for some time and took it outto read the temperature. Ramani said it was a wrong way of measuring temperature. Do you agree with Ramani? Explain your answer.

Explain how do you determine the temperature of hot water using laboratory thermometer?

Jyothi was prepared to measure the temperature of hot water with a clinical thermometer. Is it right or wrong? Why?

A thermometer was taken from a freezer and placed in a boilling water . It took 22 seconds for the thermometer to raise from -10^(@)C to 100 ^(@)C . Show that the rate of changes of temperature at some time t is 5 ^(@) C per second

Read the paragraph given below. Based on the paragraph and your acquired knowledge and understanding, answer the question. ''A traditional strategy for the protection of biodiversity has been in practice in India and some other Asian countries dimensions protected by tribal communities due to religious sanctity accorded to them. The sacred forests represent islands of pristine forests and have been free from all disturbances, though these are frequently surrounded by highly degraded landscape. In India, sacred forests are located in several parts e.g. Karnataka, Maharashtra, Kerala, Meghalaya etc and are serving as refugia for number of rare, endangered and endemic taxa.'' a. In India which are the major locations of sacred forests? b. By considering a sacred forest in your local area, list any two ecological significances of sacred forests. c. Due to the religious sanctity, sacred forests are protected to a certain extent. Do you agree? Justify your opinion.

Answer the following questions . a. The earth's magnetic field varies from point is space. Does it also change with time ? It so , on what time scate does it change appreciably ? b. The earth's core is known to contain iron. Yet geologists do not regard this as a source of the earth's magnetism why ? c. The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism . What might be the ' battery ' (i.e., the source of energy) to sustain these currents ? d. The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past ? e. The earth's field departs from its dipole substantially at large distances (greater than about 30,000 km) what agencies may be responsible for this distortion ? f. Interstellar space has an extremely weak magnetic field of the order of 10^(-12) T, Can such a weak field be of any significant consequence ? Explain. [Note : Exercise 2 is meant mainly to arouse your curiosity . Answers to some question above are tentative or unknown . Brief answers wherever possible are given at the end . For details , you should consult a good text on geomagnetism.]