PHYSICS [1 Mark Question Answer]

Upper fixed point: On the Fahrenheit scale is the mark at which water starts changing into steam at normal atmospheric pressure. It is 212°F.

Lower fixed point: On the Falirenheit scale is the mark at which pure ice melts. It is 32°F on Fahrenheit scale.

Steam point. On the Celsius scale is the mark at which water changes into steam at normal atmospheric pressure. On Celsius scale it is 100°C.

Ice point. Is the the mark on Celsius scale at which ice melts. Ice point on the Celsius scale is 0°C.

The interval between the ice point and steam point divided into 180 equal parts is called a degree on the Fahrenheit scale.

The interval between the ice point and steam point divided by 100 (hundred) equal parts is called a degree on the Celsius scale.

To measure the temperature of a body with the help of a thermometer.

Good conductors — Mercury, copper, silver, iron.
Bad conductors — Wood, air, saw dust, plastic, wool, cardboard.

Aluminium is a good conductor of heat.

Mercury is good conductor of heat.

The S.I. unit of temperature is kelvin or K. The other most common unit of temperature is degree Celsius (°C) and degree Fahrenheit (°F).

Mercury is a metal found in liquid state. It expands more and uniformly over a wide range of temperature. So mercury is used as thermometric liquid.

The floor is laid in small pieces with gaps in between to allow for the expansion during summer. However glass strips can be placed in the gaps.

When hot water is poured over the neck of the bottle, it expands. As a result the stopper gets loosened and can be removed easily.

Temperature is a quantity which tells the thermal state of a body (i.e. the degree of hotness or coldness). It determines the direction of flow of heat when the two bodies at different temperatures are placed in contact.

Mercury and Aluminium wire.

The temperature of a healthy persons is 98.6 degrees fahrenheit or 37.0 degree Celsius or 310 k.

Fahrenheit scale is generally used for clinical purposes. On this scale, the ice point is marked as 32° F and the steam point is marked as 212° F.

Celsius scale is that which has ice point as 0°C and steam point marked as 100°C.