# Temperature and its Measurement Class-6th Goyal Brothers Physics Solutions

Temperature and its Measurement Class-6th Goyal Brothers Physics Solutions Chapter-2, Unit 3. We Provide Step by Step Answers of Objective, True False , Fill in the blanks, Match the following , Study Questions of Chapter- 2 , Physical quantities and measurements ,Unit-3 (Temperature and its Measurement ). Visit official Website for detail information about ICSE Board Class-6.

## Temperature and its Measurement Class-6th

Goyal Brothers Physics Solutions Chapter-2 (Unit 3)

 Board ICSE Class 6th Subject Physics Book Name Goyal Brothers Theme-2 Physical quantities and measurements Unit-3 Temperature and its Measurement Topic Solution of exercise questions Session 2023-24

### OBJECTIVE TYPE QUESTIONS

Physics Solutions Chapter-2, unit-3

#### A. Fill in the blanks :

1. The measure of hotness or coldness of a body is called its _temperature_.
2. A device used to measure the temperature  of an object is called _thermometer_
3. The SI unit of temperature is _kelvin_.
4. The amount of surface occupied by an object or place is called its _area_.
5. The liquid used in a laboratory thermometer is _mercury_.

#### B. Write ‘True’ or ‘False’ for the following statements :

1. The thermometer consists of a very fine glass tube having a very small bore commonly called capillary tube. [T]
2. The capillary tube is protected by a thick glass tube called stem. [T]
3. The last limit of temperature 237°C was named as absolute zero. [F]
4. A clinical thermometer is marked between 95°C to 110°C. [F]
5. A clinical thermometer should be sterilized in boiling water. [F]

#### C. Statement given below are incorrect. write the correct  statement:

1. The measure of hotness or coldness is called heat energy.

Correct Statement: The measure of hotness or coldness is called temperature.

2. Water is used as liquid in laboratory thermometer.

Correct Statement: Mercury is used as liquid in laboratory thermometer.

3. 20°C on Celsius scale is equal to 20 K on kelvin scale.

Correct Statement: 20°C on Celsius scale is equal to 293 on kelvin scale.

4. The temperature below 37°C on clinical thermometer means fever.

Correct Statement: The temperature above 37°C on clinical thermometer means fever.

5. Estimations are generally reliable.

Correct Statement: Estimations are generally non reliable.

(a) 20°c

(b) 20°C

(c) 20 k

(d) 20 K

Ans: (b) 20°C

#### 2. The clinical thermometer after washing is jerked so as to:

(a) shake off water

(b) allow the mercury in capillary tube to fall below 35°C.

(c) cool the thermometer

(d) it is a ritual

Ans: (b) allow the mercury in capillary tube to fall below 35°C.

(a) 323 K

(b) 50 K

(c) 250 K

(d) 223 K

Ans: (a) 323 K

(a) 35°C

(b) 43°C

(c) 37°C

(d) 38°C

Ans: (c) 37°C

#### (e) 10-3

Column A Column B

### STUDY QUESTIONS

#### (a) What do you understand by the term temperature?

Answer: The measure of hotness or coldness of a body is called its temperature.

#### (b) Name the device used in laboratory for measuring temperature of a body.

Answer: Thermometer is used in laboratory for measuring temperature of a body.

#### (a) What do you understand by area?

Answer: The amount of surface occupied by an object or place is called its area.

#### (b) How can you measure area of regular shape by using graph paper?

Answer: For measuring area of regular shape by using graph paper following steps will be carried out:-

• At first put the shape on the graph paper.
• draw the outline of the shape on graph paper.
• Counting the boxes inside the drawn outline.
• If the area of one box is ‘A’ unit and there are ‘n’ boxes inside the outline.
• Then area of the shape will be = A × n unit.

#### State their value in (a) Celsius scale (b) kelvin scale.

Answer: In a Laboratory thermometer, Range of Celsius scale is from −10∘ C to 110∘ C.

#### Question 4. (a) Into how many degrees is the scale of laboratory thermometer divided on celsius scale?

Answer: The range of temperature of a laboratory thermometer is from −10∘C to 110∘C.

#### (b) The mercury in the common laboratory thermometer stands 2/5 of the length between the standard points, as measured from the lower standard point. What is the temperature in degree celsius?

Answer: If we take the total length of mercury in capillary tube upto the mark hundred degree centigrade.

Then the 2/5 height of Mercury will be

2/5×100° = 200/5° =40°Celsius will be the temperature.

In Kelvin = ?

Kelvin = °C+273

= 27 + 273

=300 K.

#### Question 6. Kelvin temperature is 373K . What is the corresponding temperature on celsius scale?

In celsius = ?

celsius + 273= Kelvin

= kelvin – 273

= 100°C

#### Question 7. (a) What is a clinical thermometer?

Answer: A clinical thermometer is a thermometer used to measure human body temperature. Mostly these thermometers are mercury-in-glass thermometers. They are accurate and sensitive, having a narrow place where the mercury level rises very fast.

#### (b) Why is this thermometer marked between 35°C and 42°C ?

Answer: The clinical thermometer has marking from 35 degree C to 42 degree C because it is designed in such a way that it can only measure the temperature of human body and the temperature of human body is always between 35 degree C to 42 degree C.

#### (b) What conclusion can be drawn , if the temperature of a patient is (i) 40°C (ii) 35.5°C?

Answer: If the temperature of a patient is 40°C , it means that the patient has fever.

If the temperature of a patient is 35.5°C , it means that the body does not generate enough heat.

#### (c) Why is a clinical thermometer not sterilized in boiling water?

Answer: Generally, the range of clinical thermometer is from 95F to 110F and the boling point of water is 212F . If a clinical thermometer is sterilised by boiling water, the capillary of thermometer will burst due to thermal expansion of mercury in the capillary tube of thermometer.

#### (a) What do you understand by the term estimation?

Answer: Estimation is a quick judgement about a measurement of some particular quantity.

#### (b) Is estimation a reliable way of measurement ? Support your answer by two examples.

Answer: Estimation is not reliable way of measurement it can save your time but cant give an exact result.

Example-  A player while giving a pass to a fellow player in the game of hockey always estimates distance and hits the ball accordingly.

or, a fruit merchant will buy fruit orchard by estimating how much fruit he will get and so on.

#### (c) When do we do estimations in general and why, even when tools of measurement are available ? Support your answers with examples.

Answer: When we have to make a quick judgement and we do not have any tools to do so, we make estimation. Even we make estimations when we do have tools , because actual measurement may be time consuming.

Example: Suppose you have to drink sweetened milk, and you will add two or more spoons of sugar to it according to your taste. By just estimate the amount of sugar to be added by your sensation of taste. And you need not actually weigh out certain fixed amount of sugar.

#### (c) Metric tonne = 10 kilograms

(d) Millisecond =10-3 seconds.

#### Question 11. The length of a square room is 13 m. What is the floor area of the room?

Answer: Length of a square room = 13 m (side)

Area = ?

Area of a square = Side*Side

= 13*13

= 169 m2

#### Question 12. The length of a school compound is 450 m and breadth is 145 m. Find the area of compound in (a) m2 (b) hectares.

Lengthy = 450 m

Therefore, Area in m2 is = 450*145

Area in m2 is = 65250 m2

∴ in hectares area is = 6250/(100*100)

Area in hectares is = 6.52 hectares.

#### Question 13. A district has a length of 20 Km and breadth 17 Km. Find the area of district in (a) km2 (b)hectares.

Length = 20 km

Therefore,

Area in km2 is = 20*17

Area in km2 is = 340km2

∴ in  hectares area is = 340*10*10

Area in  hectares is = 34000 hectares.

#### Question 14. A triangular cardboard is of base 20 cm and height from its base is 15 cm. What is the area of cardboard.

Base = 20 cm

Height = 15 cm

Area = 1/2*base*height

Therefore,

Area = 1/2*20*15

= 150 cm2

#### Question 15. A coin of radius 28 mm. What is the area in (a)mm2 (b) cm2 ?

value of π is = 22/7

Area = π * r2

= 22/7*28*28

∴ Area in mm2 is = 2464 mm2

whereas, Area in cm is = 22/7*28*28/(10*10) or area in mm2/(10*10)

Area in cm is = 24064 cm2

— : end of Temperature and its Measurement Class-6th Goyal Brothers Physics Solutions :–-