(a) Describe in steps how would you measure the length of a pencil using a metre ruler. Draw a diagram if necessary.
(b) What is a clinical thermometer? State its special features. Draw a neat labelled diagram of a clinical thermometer showing the range of temperature marked on it.
(a) Describe in steps how would you measure the length of a pencil using a metre ruler. Draw a diagram if necessary.
(b) What is a clinical thermometer? State its special features. Draw a neat labelled diagram of a clinical thermometer showing the range of temperature marked on it.
(a) To measure the length of a pencil using a metre rule, place metre rule with its marking close to the object. Here, let PQ is a pencil.
The end P of the pencil coincides with the zero mark on the ruler. The end Q of the pencil is read by keeping the eye at the position B vertically above the end Q.
So, the length of pencil is 4.3 cm.
(b) Doctors use a special thermometer called the clinical thermometer for measuring the temperature of the patient's body. This thermometer has markings from 35∘C to 43∘C. It has a slight bend or kink in the stem just above the bulb, this kink is called the constriction which prevents the mercury from falling back all by itself. The temperature of a healthy person is 37∘C and is marked by a red arrow.
(a) To measure the length of a pencil using a metre rule, place metre rule with its marking close to the object. Here, let PQ is a pencil.
The end P of the pencil coincides with the zero mark on the ruler. The end Q of the pencil is read by keeping the eye at the position B vertically above the end Q.
So, the length of pencil is 4.3 cm.
(b) Doctors use a special thermometer called the clinical thermometer for measuring the temperature of the patient's body. This thermometer has markings from 35∘C to 43∘C. It has a slight bend or kink in the stem just above the bulb, this kink is called the constriction which prevents the mercury from falling back all by itself. The temperature of a healthy person is 37∘C and is marked by a red arrow.
