What are the fixed points of a thermometer? What do you mean by lower fixed point and upper fixed point of a thermometer?

What do you mean by near point and far point of an eye?

What do you mean by the normal boiling point of a liquid?

What is weight thermometer?

What is used inside thermometer?

What is lower fixed point of kelvin scale?

What do you mean by defect in a crystal? What are point defects in a crystal?

What do you mean by neutral point in an electric field? Does any such point exist?

The freezing point on a thermometer is marked 20^@ and the boiling point is marked 150^@ . The reading of the thermometer at 45^@C is :

The fundamental interval of one thermometer is divided into 45 equal divisons while that on another thermometer into 100 equal divisions. The lower fixed point of the first thermometers is -2 degree and that of the other is 20 degree. What will be the reading of the first thermometer when a temperature reads 120 degree on the second thermometer?