We are advised to avoid keeping clinical thermometer in the sun or near a flame. Why?

A clinical thermometer is not used to measure the temperatuer of air.Why?

A clinical thermometer is not used to measure the temperatureof air, why?

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

Why do we jerk a clinical thermometer before we measure the body temperature?

Why do we have to bring a small object near the eyes in order to see it clearly.

Why should we avoid taking antibiotics too often to treat and infection.

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

Why do we use mercury in thermometers? Can water be used instead of mercury? What are the problems in using it?

a. The top of the atmosphere is at about 400 kV with respectto the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about 100 Vm^(-1). Why then do we not get a electric shock as we step out of our house into the openy (Assume the house to be a steel cage so there is no field inside!) b. A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area 1m^(2) . Will he get an electric shock if he touches the metal sheet next morning? c. The discharging current in the atmosphere due to the small conductivity of air is known to be 1800A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged? d. What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? (Hint: The earth has an electric field of about 100 Vm^(-1) at its surface in the downward direction, corresponding to a surface charge density =-10^(-9) Cm^(-2) ?.

Why should we avoid use of synthetic soft drinks?